Papers - Yamamoto, Naoki

Quantum Hall liquids in high-density QCD

Kentaro Nishimura, Naoki Yamamoto, Ryo Yokokura

Physical Review D 111 ( 5 ) 054010(1-7) 2025.03

Research paper (scientific journal), Joint Work, Accepted,  ISSN  24700010

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There exist metastable domain walls of the flavor-singlet meson η for the U(1) axial symmetry in two-flavor color superconductivity (2SC) in quantum chromodynamics (QCD) at large baryon density. We show that, due to the coupling of η to confined SU(2) gluons in the 2SC phase, the effective theory on the domain wall is described by the SU(2)-1 Chern-Simons theory, which is dual to the U(1)2 Chern-Simons theory. This theory has a spin-1 droplet excitation that does not carry a baryon number, which we identify as a vector meson. We also discuss the effective theories and baryonic droplet excitations on the domain walls of the flavor-singlet mesons in the superfluid phases of QCD at large isospin density and two-color QCD at large baryon density.

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Chiral kinetic theory with self-energy corrections and neutrino spin Hall effect

Naoki Yamamoto, Di-Lun Yang

Physical Review D 109 ( 5 ) 056010(1-14) 2024.03

Research paper (scientific journal), Joint Work, Accepted,  ISSN  24700010

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We systematically derive the chiral kinetic theory for chiral fermions with collisions, including the self-energy corrections, from quantum field theories. We find that the Wigner functions and chiral kinetic equations receive both the classical and quantum corrections from the self-energies and their spacetime gradients. We also apply this formalism to study nonequilibrium neutrino transport due to the interaction with thermalized electrons and nucleons, as realized in core-collapse supernovae. We derive neutrino currents along magnetic fields and neutrino spin Hall effect induced by the density gradient at first order in the Fermi constant GF for anisotropic neutrino distributions.

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Convergence of Ginzburg–Landau Expansions: Superconductivity in the Bardeen–Cooper–Schrieffer Theory and Chiral Symmetry Breaking in the Nambu–Jona-Lasinio Model

William Gyory, Naoki Yamamoto

Progress of Theoretical and Experimental Physics (The Physical Society of Japan)  2024 ( 4 ) 043D01(1-19) 2024.03

Research paper (scientific journal), Joint Work, Accepted

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We study the convergence of the Ginzburg–Landau (GL) expansion in the context of the Bardeen–Cooper–Schrieffer (BCS) theory for superconductivity and the Nambu–Jona-Lasinio (NJL) model for chiral symmetry breaking at finite temperature T and chemical potential μ. We present derivations of the all-order formulas for the coefficients of the GL expansions in both systems under the mean-field approximation. We show that the convergence radii for the BCS gap ∆ and dynamical quark mass M are given by ∆conv = πT and Mconv = √μ2 + (πT)2, respectively. We also discuss the implications of these results and the quantitative reliability of the GL expansion near the first-order chiral phase transition.

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Dipole symmetries from the topology of the phase space and the constraints on the low-energy spectrum

Tomáš Brauner, Naoki Yamamoto, Ryo Yokokura

SciPost Physics 16 ( 2 ) 051:1 - 051:32 2024.02

Research paper (scientific journal), Joint Work, Accepted

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We demonstrate the general existence of a local dipole conservation law in bosonic field theory. The scalar charge density arises from the symplectic form of the system, whereas the tensor current descends from its stress tensor. The algebra of spatial translations becomes centrally extended in presence of field configurations with a finite nonzero charge. Furthermore, when the symplectic form is closed but not exact, the system may, surprisingly, lack a well-defined momentum density. This leads to a theorem for the presence of additional light modes in the system whenever the short-distance physics is governed by a translationally invariant local field theory. We also illustrate this mechanism for axion electrodynamics as an example of a system with Nambu–Goldstone modes of higher-form symmetries.

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Chiral asteroseismology: seismic oscillations caused by chiral transport in neutron stars and supernovae

Sota Hanai, Naoki Yamamoto

Journal of Cosmology and Astroparticle Physics 10 ( 018 ) 1 - 25 2023.10

Research paper (scientific journal), Joint Work, Accepted

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We study the novel asteroseismology of the chiral magnetic wave (CMW) of the quark number density in relativistic quark matter inside neutron stars and core-collapse supernovae and the chiral vortical wave (CVW) of the neutrino number density in relativistic neutrino matter at the core of supernovae. We call the oscillation modes for these chiral waves the chiral magnetic mode (CM-mode) and chiral vortical mode (CV-mode), respectively. We derive the dispersion relations of these new modes in the presence of the chirality flipping due to the finite quark mass and diffusion. We then estimate the possible frequencies of these modes and amplitudes of the resulting gravitational waves. In particular, since the CM-mode can exist only in quark matter with nearly gapless quarks (such as the two-flavor color superconductivity) for a sufficiently strong magnetic field, corresponding gravitational waves provide a new possible probe for such quark matter and the magnetic field in neutron stars.

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Generalized chiral instabilities, linking numbers, and non-invertible symmetries

Naoki Yamamoto, Ryo Yokokura

Journal of High Energy Physics 07 ( 45 ) 1 - 29 2023.07

Research paper (scientific journal), Joint Work, Accepted

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We demonstrate a universal mechanism of a class of instabilities in infrared regions for massless Abelian p-form gauge theories with topological interactions, which we call generalized chiral instabilities. Such instabilities occur in the presence of initial electric fields for the p-form gauge fields. We show that the dynamically generated magnetic fields tend to decrease the initial electric fields and result in configurations with linking numbers, which can be characterized by non-invertible global symmetries. The so-called chiral plasma instability and instabilities of the axion electrodynamics and (4+1)-dimensional Maxwell-Chern-Simons theory in electric fields can be described by the generalized chiral instabilities in a unified manner. We also illustrate this mechanism in the (2+1)-dimensional Goldstone-Maxwell model in electric field.

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Effective Chiral Magnetic Effect from Neutrino Radiation

Naoki Yamamoto, Di-Lun Yang

Physical Review Letters 131 ( 1 ) 012701(1-6) 2023.07

Research paper (scientific journal), Joint Work, Accepted,  ISSN  00319007

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We develop an approach to chiral kinetic theories for electrons close to equilibrium and neutrinos away from equilibrium based on a systematic power counting scheme for different timescales of electromagnetic and weak interactions. Under this framework, we derive electric and energy currents along magnetic fields induced by neutrino radiation in general nonequilibrium states. This may be regarded as an effective chiral magnetic effect (CME), which is present without a chiral chemical potential, unlike the conventional CME. We also consider the so-called gain region of core-collapse supernovae as an example and find that the effective CME enhanced by persistent neutrino emission in time is sufficiently large to lead to the inverse cascade of magnetic and fluid kinetic energies and observed magnitudes of pulsar kicks. Our framework may also be applicable to other dense-matter systems involving nonequilibrium neutrinos.

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Chiral effects in astrophysics and cosmology

Kohei Kamada, Naoki Yamamoto, Di-Lun Yang

Progress in Particle and Nuclear Physics 129   104016 2023.03

Research paper (scientific journal), Joint Work, Accepted,  ISSN  01466410

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The microscopic quantum nature of elementary particles, chirality, leads to macroscopic phenomena like the chiral anomaly, chiral magnetic effect, and chiral plasma instability. We review recent progress of the studies of these chiral effects in high-energy astrophysics, such as pulsar kicks, magnetars, and core-collapse supernovae, and early Universe cosmology, such as the primordial magnetic field, baryogenesis, and chiral gravitational waves. We also provide a pedagogical introduction to the chiral effects and low-energy effective theories to describe them in and out of equilibrium—the chiral (magneto)hydrodynamics, chiral kinetic theory, and chiral radiation transport theory for neutrinos.

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Unstable Nambu-Goldstone modes

Naoki Yamamoto, Ryo Yokokura

Physical Review D 106 ( 10 ) 105004(1-9) 2022.11

Research paper (scientific journal), Joint Work, Accepted,  ISSN  24700010

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Nambu-Goldstone (NG) modes for 0-form and higher-form symmetries can become unstable in the presence of background fields. Examples include the instability of a photon with a time-dependent axion background or with a chirality imbalance, known as the chiral plasma instability, and the instability of a dynamical axion with a background electric field. We show that all these phenomena can be universally described by a symmetry algebra for 0-form and higher-form symmetries. We prove a counting rule for the number of unstable NG modes in terms of correlation functions of broken symmetry generators. Based on our unified description, we further give a simple new example where one of the NG modes associated with the spontaneous 0-form symmetry breaking U(1)×U(1)→{1} becomes unstable.

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Chiral gravitational waves from thermalized neutrinos in the early Universe

Philipp Gubler, Naoki Yamamoto, Di-Lun Yang

Journal of Cosmology and Astroparticle Physics 09 ( 025 ) 1 - 36 2022.09

Research paper (scientific journal), Joint Work, Accepted

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We investigate polarized gravitational waves generated by chiral fermions in the early Universe. In particular, we focus on the contribution from left-handed neutrinos in thermal equilibrium with finite temperature and chemical potential in the radiation dominated era. We compute the correlation functions of gravitational fields pertinent to the Stokes parameter V characterizing the circular polarization of gravitational waves in the Minkowski and expanding spacetime backgrounds. In the expanding universe, we find that the thermalized neutrinos induce a non-vanishing V linear to the neutrino degeneracy parameter and wavenumber of gravitational waves in the long wavelength region. While the magnitude of the gravitational waves generated by thermal neutrinos is too small to be detectable by current and planned third generation gravitational wave detectors, their observations by future generation detectors for ultra-high frequency regimes could provide information on the neutrino degeneracy parameter in the early Universe.

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Chiral plasma instability and inverse cascade from nonequilibrium left-handed neutrinos in core-collapse supernovae

Jin Matsumoto, Naoki Yamamoto, Di-Lun Yang

Physical Review D 105 ( 12 ) 123029(1-7) 2022.06

Research paper (scientific journal), Joint Work, Accepted,  ISSN  24700010

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We show that the backreaction of left-handed neutrinos out of equilibrium on the matter sector induces an electric current proportional to a magnetic field even without a chiral imbalance for electrons in core-collapse supernovae. We derive the transport coefficient of this effect based on the recently formulated chiral radiation transport theory for neutrinos. This chiral electric current generates a strong magnetic field via the so-called chiral plasma instability, which could provide a new mechanism for the strong and stable magnetic field of magnetars. We also numerically study the physical origin of the inverse cascade of the magnetic energy in the magnetohydrodynamics including this current. Our results indicate that incorporating the chiral effects of neutrinos would drastically modify the hydrodynamic evolutions of supernovae, which may also be relevant to the explosion dynamics.

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Photonic spin Hall effect from quantum kinetic theory in curved spacetime

Kazuya Mameda, Naoki Yamamoto, Di-Lun Yang

Physical Review D 105 ( 9 ) 096019(1-9) 2022.05

Research paper (scientific journal), Joint Work, Accepted,  ISSN  24700010

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Based on quantum field theory, we formulate the Wigner function and quantum kinetic theory for polarized photons in curved spacetimes which admit a covariantly constant timelike vector. From this framework, the photonic chiral/zilch vortical effects are reproduced in a rigidly rotating coordinate. In a spatially inhomogeneous coordinate, we derive the spin Hall effect for the photon helicity current and energy current in equilibrium. Our derivation reveals that such photonic Hall effect are related to the photonic vortical effect via the Lorentz invariance and their transport coefficients match each other.

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Magnetic field induced neutrino chiral transport near equilibrium

Naoki Yamamoto, Di-Lun Yang

Physical Review D 104 ( 12 ) 123019(1-15) 2021.12

Research paper (scientific journal), Joint Work, Accepted,  ISSN  24700010

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Based on the recently formulated chiral radiation transport theory for left-handed neutrinos, we study the chiral transport of neutrinos near thermal equilibrium in core-collapse supernovae. We first compute the near-equilibrium solution of the chiral radiation transport equation under the relaxation time approximation, where the relaxation time is directly derived from the effective field theory of the weak interaction. By using such a solution, we systematically derive analytic expressions for the nonequilibrium corrections of the neutrino energy-momentum tensor and neutrino number current induced by magnetic fields via the neutrino absorption on nucleons. In particular, we find the nonequilibrium neutrino energy current proportional to the magnetic field. We also discuss its phenomenological consequences such as the possible relation to pulsar kicks.

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Chiral soliton lattice phase in warm QCD

Tomáš Brauner, Helena Kolešová, Naoki Yamamoto

Physics Letters B 823 ( 10 ) 136767(1-7) 2021.11

Research paper (scientific journal), Joint Work, Accepted,  ISSN  03702693

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We analyze the phase diagram of quantum chromodynamics at low-to-moderate temperature, baryon chemical potential and external magnetic field within chiral perturbation theory at next-to-leading order of the derivative expansion. Our main result is that the anomaly-induced chiral soliton lattice (CSL) phase is stabilized by thermal fluctuations. As a consequence, the CSL state may survive up to temperatures at which chiral symmetry is restored.

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Floquet vacuum engineering: Laser-driven chiral soliton lattice in the QCD vacuum

Akihiro Yamada, Naoki Yamamoto

Physical Review D 104 ( 5 ) 054041(1-7) 2021.09

Research paper (scientific journal), Joint Work, Accepted,  ISSN  24700010

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What happens to the QCD vacuum when a time-periodic circularly polarized laser field with a sufficiently large intensity and frequency is applied? Based on the Floquet formalism for periodically driven systems and the systematic low-energy effective theory of QCD, we show that for a sufficiently large frequency and above a critical intensity, the QCD vacuum is unstable against the chiral soliton lattice of pions; a crystalline structure of topological solitons that spontaneously breaks parity and continuous translational symmetries. Our work would pave the way for novel “Floquet vacuum engineering.”

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Positive magnetoresistance induced by hydrodynamic fluctuations in chiral media

Noriyuki Sogabe, Naoki Yamamoto, Yi Yin

Journal of High Energy Physics 09 ( 131 ) 1 - 31 2021.09

Research paper (scientific journal), Joint Work, Accepted

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We analyze the combined effects of hydrodynamic fluctuations and chiral magnetic effect (CME) for a chiral medium in the presence of a background magnetic field. Based on the recently developed non-equilibrium effective field theory, we show fluctuations give rise to a CME-related positive contribution to magnetoresistance, while the early studies without accounting for the fluctuations find a CME-related negative magnetoresistance. At zero axial relaxation rate, the fluctuations contribute to the transverse conductivity in addition to the longitudinal one.

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Topological mass generation in gapless systems

Naoki Yamamoto, Ryo Yokokura

Physical Review D 104 ( 2 ) 025010(1-17) 2021.07

Research paper (scientific journal), Joint Work, Accepted,  ISSN  24700010

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Mass generation of gauge fields can be universally described by topological couplings in gapped systems, such as the Abelian Higgs model in (3+1) dimensions and the Maxwell-Chern-Simons theory in (2+1) dimensions. These systems also exhibit the spontaneous breaking of higher-form Zk symmetries and topological orders for level k≥2. In this paper, we consider topological mass generation in gapless systems. As a paradigmatic example, we study the axion electrodynamics with level k in (3+1) dimensions in background fields that hosts both gapped and gapless modes. We argue that the gapped mode is related to those in fully gapped systems in lower dimensions via dimensional reduction. We show that this system exhibits the spontaneous breaking of a higher-form Zk symmetry despite the absence of the conventional topological order. In the case of the background magnetic field, we also derive the low-energy effective theory of the gapless mode with the quadratic dispersion relation and show that it satisfies the chiral anomaly matching.

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Helical magnetic effect and the chiral anomaly

Naoki Yamamoto, Di-Lun Yang

Physical Review D 103 ( 12 ) 125003(1-7) 2021.06

Research paper (scientific journal), Joint Work, Accepted,  ISSN  24700010

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In the presence of the fluid helicity v·ω, the magnetic field induces an electric current of the form j=C_{HME}(v·ω)B. This is the helical magnetic effect (HME). We show that for massless Dirac fermions with charge e=1, the transport coefficient CHME is fixed by the chiral anomaly coefficient C=1/(2π^2) as C_{HME}=C/2 independently of interactions. We show the conjecture that the coefficient of the magnetovorticity coupling for the local vector charge, n=CBωB·ω, is related to the chiral anomaly coefficient as CBω=C/2. We also discuss the condition for the emergence of the helical plasma instability that originates from the HME.

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Wigner functions and quantum kinetic theory of polarized photons

Koichi Hattori, Yoshimasa Hidaka, Naoki Yamamoto, Di-Lun Yang

Journal of High Energy Physics 02 ( 1 ) 1 - 26 2021.02

Research paper (scientific journal), Joint Work, Accepted

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We derive the Wigner functions of polarized photons in the Coulomb gauge with the ħ expansion applied to quantum field theory, and identify side-jump effects for massless photons. We also discuss the photonic chiral vortical effect for the Chern-Simons current and zilch vortical effect for the zilch current in local thermal equilibrium as a consistency check for our formalism. The results are found to be in agreement with those obtained from different approaches. Moreover, using the real-time formalism, we construct the quantum kinetic theory (QKT) for polarized photons. By further adopting a specific power counting scheme for the distribution functions, we provide a more succinct form of an effective QKT. This photonic QKT involves quantum corrections associated with self-energy gradients in the collision term, which are analogous to the side-jump corrections pertinent to spin-orbit interactions in the chiral kinetic theory for massless fermions. The same theoretical framework can also be directly applied to weakly coupled gluons in the absence of background color fields.

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Topological term, QCD anomaly, and the η′ chiral soliton lattice in rotating baryonic matter

Kentaro Nishimura, Naoki Yamamoto

Journal of High Energy Physics 07 ( 196 ) 1 - 23 2020.07

Research paper (scientific journal), Joint Work, Accepted,  ISSN  11266708

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We study the ground states of low-density hadronic matter and high-density color-flavor locked color superconducting phase in three-flavor QCD at finite baryon chemical potential under rotation. We find that, in both cases under sufficiently fast rotation, the combination of the rotation-induced topological term for the η′ meson and the QCD anomaly leads to an inhomogeneous condensate of the η′ meson, known as the chiral soliton lattice (CSL). We find that, when baryon chemical potential is much larger than isospin chemical potential, the critical angular velocity for the realization of the η′ CSL is much smaller than that for the π0 CSL found previously. We also argue that the η′ CSL states in flavor-symmetric QCD at low density and high density should be continuously connected, extending the quark-hadron continuity conjecture in the presence of the rotation.

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Chiral Radiation Transport Theory of Neutrinos

Naoki Yamamoto, Di-Lun Yang

Astrophysical Journal 895 ( 1 ) 1 - 16 2020.05

Research paper (scientific journal), Joint Work, Accepted,  ISSN  0004637X

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We construct the chiral radiation transport equation for left-handed neutrinos in the context of radiation hydrodynamics for core-collapse supernovae. Based on the chiral kinetic theory incorporating quantum corrections due to the chirality of fermions, we derive a general relativistic form of the chiral transfer equation with collisions. We show that such quantum corrections explicitly break the spherical symmetry and axisymmetry of the system. In the inertial frame, in particular, we find that the so-called side jump leads to quantum corrections in the collisions between neutrinos and matter. We also derive analytic forms of such corrections in the emission and absorption rates for the neutrino absorption process. These corrections result in the generation of kinetic helicity and cross helicity of matter, which should then modify the subsequent evolution of matter. This theoretical framework can be applied to investigate the impacts of the chirality of neutrinos on the evolution of core-collapse supernovae.

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Functional renormalization group approach to color superconducting phase transition

Gergely Fejős, Naoki Yamamoto

Journal of High Energy Physics 12 ( 69 )  2019.12

Research paper (scientific journal), Joint Work, Accepted,  ISSN  11266708

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We investigate the order of the color superconducting phase transition using the functional renormalization group approach. We analyze the Ginzburg-Landau effective theory of color superconductivity and more generic scalar SU(N ) gauge theories by calculating the β function of the gauge coupling in arbitrary dimension d based on two different regularization schemes. We find that in d = 3, due to gluon fluctuation effects, the β function never admits an infrared fixed point solution. This indicates that, unlike the ordinary superconducting transition, color superconductivity can only show a first-order phase transition.

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Critical Dynamics of Massless QCD with the Chiral Magnetic Effect

Masaru Hongo, Noriyuki Sogabe, Naoki Yamamoto

JPS Conference Proceedings 26   031026(1-4) 2019.11

Research paper (international conference proceedings), Joint Work, Accepted

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Anomaly-Induced Effects of Rotating Dense Matter

Xu-Guang Huang, Kentaro Nishimura, Naoki Yamamoto

JPS Conference Proceedings 26   031020(1-4) 2019.11

Research paper (international conference proceedings), Joint Work, Accepted

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Triangle anomalies and nonrelativistic Nambu-Goldstone modes of generalized global symmetries

Noriyuki Sogabe, Naoki Yamamoto

Physical Review D 99 ( 12 ) 125003(1-5) 2019.06

Research paper (scientific journal), Joint Work, Accepted,  ISSN  24700010

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In massless QCD coupled to QED in an external magnetic field, a photon with the linear polarization in the direction of the external magnetic field mixes with the charge neutral pion through the triangle anomaly, leading to one gapless mode with the quadratic dispersion relation ω∼k2 and one gapped mode. We show that this gapless mode can be interpreted as the so-called type-B Nambu-Goldstone (NG) mode associated with the spontaneous breaking of generalized global symmetries and that its presence is solely dictated by the anomalous commutator in the symmetry algebra. We also argue a possible realization of such nonrelativistic NG modes in 3-dimensional Dirac semimetals.

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Numerical study on chiral turbulence of rotating neutrino matter in supernovae

Hiromichi Kobayashi, Naoki Yamamoto, Yoshihiro Okuno

11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019  2019

Research paper (conference, symposium, etc.), Joint Work

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We numerically study the chiral turbulence of rotating neutrino matter in the core of supernovae. The rotation yields inverse cascade and the novel current along the direction of rotation called the chiral vortical effect. We for the first time demonstrate that the chiral vortical effect induces a flow in the direction of vorticity and a conversion from fluid helicity to neutrino density. These results may potentially lead to asymmetrical supernova explosions and the increase in the explosion energy in three-dimensional simulations.

Does the chiral magnetic effect change the dynamic universality class in QCD?

Masaru Hongo, Noriyuki Sogabe, Naoki Yamamoto

Journal of High Energy Physics 11 ( 108 )  2018.11

Research paper (scientific journal), Joint Work, Accepted

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Chiral magnetohydrodynamic turbulence in core-collapse supernovae

Youhei Masada, Kei Kotake, Tomoya Takiwaki, Naoki Yamamoto

Physical Review D 98 ( 8 ) 083018 2018.10

Research paper (scientific journal), Joint Work, Accepted

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Spin Hall effect of gravitational waves

Naoki Yamamoto

Physical Review D (Rapid Communication) 98 ( 6 ) 061701(1-5) 2018.09

Research paper (scientific journal), Single Work, Accepted

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Anomalous effects of dense matter under rotation

Xu-Guang Huang, Kentaro Nishimura, Naoki Yamamoto

Journal of High Energy Physics 02 ( 069 )  2018.02

Research paper (scientific journal), Joint Work, Accepted

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From chirality of neutrinos to supernovae

Naoki Yamamoto

JPS Conference Proceedings 20   011023(1-4) 2018.01

Research paper (international conference proceedings), Single Work, Accepted

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Photonic chiral vortical effect

Naoki Yamamoto

Physical Review D (Rapid Communication) 96 ( 6 ) 051902(1-5) 2017.09

Research paper (scientific journal), Single Work, Accepted

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Phases of circle-compactified QCD with adjoint fermions at finite density

Takuya Kanazawa, Mithat Ünsal, Naoki Yamamoto

Physical Review D 96 ( 3 ) 034022(1-16) 2017.08

Research paper (scientific journal), Joint Work, Accepted

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Axion crystals

Sho Ozaki, Naoki Yamamoto

Journal of High Energy Physics 08 ( 098 )  2017.08

Research paper (scientific journal), Joint Work, Accepted

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Chiral Shock Waves

Srimoyee Sen, Naoki Yamamoto

Physical Review Letters 118 ( 18 ) 181601(1-5) 2017.05

Research paper (scientific journal), Joint Work, Accepted

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Chiral soliton lattice and charged pion condensation in strong magnetic fields

Tomáš Brauner, Naoki Yamamoto

Journal of High Energy Physics 4 ( 132 )  2017.04

Research paper (scientific journal), Joint Work, Accepted

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Chiral transport of neutrinos in supernovae

Naoki Yamamoto

EPJ Web of Conferences 137   09013(1-7) 2017.03

Research paper (international conference proceedings), Single Work

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New dynamic critical phenomena in nuclear and quark superfluids

Noriyuki Sogabe, Naoki Yamamoto

Physical Review D 95 ( 3 ) 034028(1-8) 2017.02

Research paper (scientific journal), Joint Work

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Nonlinear chiral transport phenomena

Jiunn-Wei Chen, Takeaki Ishii, Shi Pu, Naoki Yamamoto

Physical Review D 93 ( 12 ) 125023(1-5) 2016.06

Research paper (scientific journal), Joint Work, Accepted

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Scaling laws in chiral hydrodynamic turbulence

Naoki Yamamoto

Physical Review D 93 ( 12 ) 125016(1-7) 2016.06

Research paper (scientific journal), Single Work, Accepted

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Axion electrodynamics and nonrelativistic photons in nuclear and quark matter

Naoki Yamamoto

Physical Review D 93 ( 8 ) 085036(1-5) 2016.04

Research paper (scientific journal), Single Work, Accepted

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Non-Abelian chiral instabilities at high temperature on the lattice

Yukinao Akamatsu, Alexander Rothkopf, Naoki Yamamoto

Journal of High Energy Physics 3 ( 210 )  2016.03

Research paper (scientific journal), Joint Work, Accepted

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Chiral transport of neutrinos in supernovae: Neutrino-induced fluid helicity and helical plasma instability

Naoki Yamamoto

Physical Review D 93 ( 6 ) 065017(1-13) 2016.03

Research paper (scientific journal), Single Work, Accepted

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U(1) axial symmetry and Dirac spectra in QCD at high temperature

Takuya Kanazawa, Naoki Yamamoto

Journal of High Energy Physics 1 ( 141 )  2016.01

Research paper (scientific journal), Joint Work

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Generalized Bloch theorem and chiral transport phenomena

Naoki Yamamoto

Physical Review D 92 ( 8 ) 085011(1-9) 2015.10

Research paper (scientific journal), Single Work, Accepted,  ISSN  1550-7998

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Chiral Alfven Wave in Anomalous Hydrodynamics

Naoki Yamamoto

Physical Review Letters 115 ( 14 ) 141601(1-4) 2015.09

Research paper (scientific journal), Single Work, Accepted,  ISSN  0031-9007

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Quasi-instantons in QCD with chiral symmetry restoration

Takuya Kanazawa, Naoki Yamamoto

Physical Review D 91 ( 10 ) 105015(1-5) 2015.05

Research paper (scientific journal), Joint Work, Accepted,  ISSN  1550-7998

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Single-particle spectral density of the unitary Fermi gas: Novel approach based on the operator product expansion, sum rules and the maximum entropy method

Philipp Gubler, Naoki Yamamoto, Tetsuo Hatsuda, Yusuke Nishida

Annals of Physics 356   467 - 497 2015.03

Research paper (scientific journal), Joint Work

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Chiral Langevin theory for non-Abelian plasmas

Yukinao Akamatsu, Naoki Yamamoto

Physical Review D 90 ( 12 ) 125031(1-17) 2014.12

Research paper (scientific journal), Joint Work,  ISSN  1550-7998

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Magnetic QCD Critical Point

Naoki Yamamoto

素粒子論研究（電子版） 17 2014.03

Research paper (bulletin of university, research institution), Single Work

New critical point for QCD in a magnetic field

Thomas D. Cohen, Naoki Yamamoto

Physical Review D 89 ( 5 ) 054029(1-5) 2014.03

Research paper (scientific journal), Joint Work,  ISSN  1550-7998

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Banks-Casher-type relations for complex Dirac spectra

Takuya Kanazawa, Tilo Wettig, Naoki Yamamoto

Proceedings of Science (LATTICE2013) 193 2014

Research paper (international conference proceedings), Joint Work

Chiral Plasma Instabilities

Yukinao Akamatsu, Naoki Yamamoto

Physical Review Letters 111 ( 5 ) 052002(1-5) 2013.08

Research paper (scientific journal), Joint Work, Accepted,  ISSN  0031-9007

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Banks-Casher-type relation for the BCS gap at high density

Takuya Kanazawa, Tilo Wettig, Naoki Yamamoto

European Physical Journal A 49 ( 7 )  2013.07

Research paper (scientific journal), Joint Work,  ISSN  1434-6001

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Kinetic theory with Berry curvature from quantum field theories

Dam Thanh Son, Naoki Yamamoto

Physical Review D 87 ( 8 ) 085016(1-12) 2013.04

Research paper (scientific journal), Joint Work, Accepted,  ISSN  1550-7998

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String-inspired solution to the sign problem and overlapping problem

Masanori Hanada, Yoshinori Matsuo, Naoki Yamamoto

J. Phys. Conf. Ser. 432   012008 2013

Research paper (international conference proceedings), Joint Work

Large-Nc universality in QCD and QCD-like theories

Masanori Hanada, Yoshinori Matsuo, Naoki Yamamoto

Int. J. Mod. Phys. Conf. Ser. 21 ( 140 )  2013

Research paper (international conference proceedings), Joint Work

Some exact results on the QCD critical point

Yoshimasa Hidaka, Naoki Yamamoto

J. Phys. Conf. Ser. 432 ( 1 ) 012017(1-5) 2013

Research paper (international conference proceedings), Joint Work

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Berry Curvature, Triangle Anomalies, and the Chiral Magnetic Effect in Fermi Liquids

Dam Thanh Son, Naoki Yamamoto

Physical Review Letters 109 ( 18 ) 181602(1-4) 2012.11

Research paper (scientific journal), Joint Work, Accepted,  ISSN  0031-9007

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Sign problem and phase quenching in finite-density QCD: Models, holography, and lattice

Masanori Hanada, Yoshinori Matsuo, Naoki Yamamoto

Physical Review D 86 ( 7 )  2012.10

Research paper (scientific journal), Joint Work,  ISSN  1550-7998

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No-Go Theorem for Critical Phenomena in Large-Nc QCD

Yoshimasa Hidaka, Naoki Yamamoto

Physical Review Letters 108 ( 12 ) 121601(1-4) 2012.03

Research paper (scientific journal), Joint Work, Accepted,  ISSN  0031-9007

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Universality of Phases in QCD and QCD-like Theories

Masanori Hanada, Naoki Yamamoto

Journal of High Energy Physics  ( 2 )  2012.02

Research paper (scientific journal), Joint Work, Accepted,  ISSN  1126-6708

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Singular values of the Dirac operator at nonzero density

Tilo Wettig, Takuya Kanazawa, Naoki Yamamoto

Proceedings of Science (LATTICE2012)    087 2012

Research paper (international conference proceedings), Joint Work

Singular values of the Dirac operator in dense QCD-like theories

Takuya Kanazawa, Tilo Wettig, Naoki Yamamoto

Journal of High Energy Physics  ( 12 )  2011.12

Research paper (scientific journal), Joint Work,  ISSN  1029-8479

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Confined monopoles induced by quantum effects in dense QCD

Minoru Eto, Muneto Nitta, Naoki Yamamoto

Physical Review D 83 ( 8 )  2011.04

Research paper (scientific journal), Joint Work,  ISSN  1550-7998

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BEC-BCS crossover driven by the axial anomaly in the NJL model

Hiroaki Abuki, Gordon Baym, Tetsuo Hatsuda, Naoki Yamamoto

AIP Conference Proceedings 1317 ( 354 )  2011

Research paper (international conference proceedings), Joint Work

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Universality of phase diagrams in QCD and QCD-like theories

Masanori Hanada, Naoki Yamamoto

Proceedings of Science (LATTICE2011) 221 2011

Research paper (international conference proceedings), Joint Work

Nambu-Jona-Lasinio model of dense three-flavor matter with axial anomaly: The low temperature critical point and BEC-BCS diquark crossover

Hiroaki Abuki, Gordon Baym, Tetsuo Hatsuda, Naoki Yamamoto

Physical Review D 81 ( 12 )  2010.06

Research paper (scientific journal), Joint Work, Accepted,  ISSN  1550-7998

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Dirac spectrum in dense two-color QCD

金澤 拓也, Tilo Wettig, 山本 直希

素粒子論研究 118 ( 1 ) A151 - A153 2010.05

Research paper (bulletin of university, research institution), Joint Work

Hadron−quark duality and Lee−Yang zeros in dense QCD

山本 直希、金澤 拓也

素粒子論研究 118 ( 1 ) A118 - A120 2010.05

Research paper (bulletin of university, research institution), Joint Work

Instabilities of Non-Abelian Vortices in Dense QCD

Minoru Eto, Muneto Nitta, Naoki Yamamoto

Physical Review Letters 104 ( 16 )  2010.04

Research paper (scientific journal), Joint Work, Accepted,  ISSN  0031-9007

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Chiral random matrix theory for two-color QCD at high density

Takuya Kanazawa, Tilo Wettig, Naoki Yamamoto

Physical Review D (Rapid Communication) 81 ( 8 )  2010.04

Research paper (scientific journal), Joint Work, Accepted,  ISSN  1550-7998

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Exact results for two-color QCD at low and high density

Takuya Kanazawa, Tilo Wettig, Naoki Yamamoto

Proceedings of Science (LATTICE2010) 219 2010

Research paper (international conference proceedings), Joint Work

Chiral Lagrangian and spectral sum rules for dense two-color QCD

Takuya Kanazawa, Tilo Wettig, Naoki Yamamoto

Journal of High Energy Physics  ( 8 )  2009.08

Research paper (scientific journal), Joint Work,  ISSN  1126-6708

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Dense QCD in a Finite Volume

Naoki Yamamoto, Takuya Kanazawa

Physical Review Letters 103 ( 3 )  2009.07

Research paper (scientific journal), Joint Work, Accepted,  ISSN  0031-9007

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Chiral Lagrangian and spectral sum rules for two-color QCD at high density

Takuya Kanazawa, Tilo Wettig, Naoki Yamamoto

Proceedings of Science (LATTICE2009) 195 2009

Research paper (international conference proceedings), Joint Work

Instanton-induced crossover in dense QCD

Naoki Yamamoto

Journal of High Energy Physics  ( 12 )  2008.12

Research paper (scientific journal), Single Work, Accepted,  ISSN  1126-6708

The axial anomaly and the phases of dense QCD

Gordon Baym, Tetsuo Hatsuda, Motoi Tachibana, Naoki Yamamoto

Journal of Physics G: Nuclear and Particle Physics 35 ( 10 )  2008.10

Research paper (international conference proceedings), Joint Work,  ISSN  0954-3899

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Spectral continuity in dense QCD

Tetsuo Hatsuda, Motoi Tachibana, Naoki Yamamoto

Physical Review D (Rapid Communication) 78 ( 1 )  2008.07

Research paper (scientific journal), Joint Work,  ISSN  1550-7998

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QCD Sum Rules for Vector Mesons in Color Superconducting Quark Matter

Tetsuo Hatsuda, Motoi Tachibana, Naoki Yamamoto

素粒子論研究 116 ( 2 ) B41 2008.06

Research paper (bulletin of university, research institution), Joint Work

Spectral Continuity of Vector Mesons in Dense QCD

Naoki Yamamoto, Tetsuo Hatsuda, Motoi Tachibana

Progress of Theoretical Physics Supplement  ( 174 ) 84 - 87 2008

Research paper (international conference proceedings), Joint Work,  ISSN  0375-9687

Phase structure, collective modes, and the axial anomaly in dense QCD

Naoki Yamamoto, Motoi Tachibana, Tetsuo Hatsuda, Gordon Baym

Physical Review D 76 ( 7 )  2007.10

Research paper (scientific journal), Joint Work, Accepted,  ISSN  1550-7998

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Hadron-quark continuity induced by the axial anomaly in dense QCD

N. Yamamoto, T. Hatsuda, M. Tachibana, G. Baym

Journal of Physics G: Nuclear and Particle Physics 34 ( 8 ) S635 - S638 2007.07

Research paper (international conference proceedings), Joint Work, Accepted

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Chiral-super interplay in QCD

Motoi Tachibana, Naoki Yamamoto, Tetsuo Hatsuda, Gordon Baym

Progress of Theoretical Physics Supplement  ( 168 )  2007

Research paper (international conference proceedings), Joint Work,  ISSN  0375-9687

New critical point induced by the axial anomaly in dense QCD

Tetsuo Hatsuda, Motoi Tachibana, Naoki Yamamoto, Gordon Baym

Physical Review Letters 97 ( 12 )  2006.09

Research paper (scientific journal), Joint Work,  ISSN  0031-9007

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