Publications (112)
Generalized Nambu-Goldstone pion in dense matter: a schematic NJL model
Yifan Song, Gordon Baym
Chiral symmetry is always broken in cold, dense matter, by chiral condensation at low densities and by diquark condensation at high density. We construct here, within a schematic N…
Continuity of vortices from the hadronic to the color-flavor locked phase in dense matter
Mark G. Alford, Gordon Baym, Kenji Fukushima +2
We study how vortices in dense superfluid hadronic matter can connect to vortices in superfluid quark matter, as in rotating neutron stars, focusing on the extent to which quark-ha…
Finite Temperature Collapse of a Bose Gas with Attractive Interactions
Erich J. Mueller, Gordon Baym
We study the mechanical stability of the weakly interacting Bose gas with attractive interactions, and construct a unified picture of the collapse valid from the low temperature co…
Detection of BCS pairing in neutral Fermi fluids via Stokes scattering: the Hebel Slichter effect
G. M. Bruun, Gordon Baym
We consider the effects of superfluidity on the light scattering properties of a two component gas of fermionic atoms. It is demonstrated that the scattered intensity of the Stoke/…
Phase structure, collective modes, and the axial anomaly in dense QCD
Naoki Yamamoto, Motoi Tachibana, Tetsuo Hatsuda +1
Using a general Ginzburg-Landau effective Lagrangian, we study the topological structure and low-lying collective modes of dense QCD having both chiral and diquark condensates, for…
Testing dark decays of baryons in neutron stars
Gordon Baym, D. H. Beck, Peter Geltenbort +1
We demonstrate that the observation of neutron stars with masses greater than one solar mass places severe demands on any exotic neutron decay mode that could explain the discrepan…
Structure of virtual photon polarization in ultrarelativistic heavy-ion collisions
Gordon Baym, Tetsuo Hatsuda, Michael Strickland
Anisotropy in heavy-ion collisions leads to polarization of both direct and virtual photons, the latter detected via internal conversion to dileptons pairs. Thus measurement of pho…
Entropy in the quark-hadron transition
Kanako Yamazaki, T. Matsui, Gordon Baym
We study, in the PNJL model, how the entropy of interacting quarks reflects the change in the effective degrees of freedom as the temperature increases through the quark-hadron pha…
Condensate superfluidity and infrared structure: the Josephson relation
Markus Holzmann, Gordon Baym
We derive the Josephson relation in a superfluid between the condensate density, the superfluid mass density, and the infrared structure of the single particle Green's function by…
Superfluid transition temperature and fluctuation theory of spin-orbit and Rabi-coupled fermions with tunable interactions
Philip D. Powell, Gordon Baym, Carlos Sa de Melo
We obtain the superfluid transition temperature of equal Rashba-Dresselhaus spin-orbit and Rabi-coupled Fermi superfluids, from the Bardeen-Cooper-Schrieffer (BCS) to Bose-Einstein…
Transport in ultradilute solutions of He in superfluid He
Gordon Baym, D. H. Beck, C. J. Pethick
We calculate the effect of a heat current on transporting He dissolved in superfluid He at ultralow concentration, as will be utilized in a proposed experimental search for…
The NJL 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 +1
We study the QCD phase structure in the three-flavor Nambu-Jona-Lasinio model, incorporating the interplay between the chiral and diquark condensates induced by the axial anomaly.…
Magnetic Fields Produced by Phase Transition Bubbles in the Electroweak Phase Transition
Gordon Baym, Dietrich Bödeker, Larry McLerran
The electroweak phase transition, if proceeding through nucleation and growth of bubbles, should generate large scale turbulent flow, which in turn generates magnetic turbulence an…
Superfluid transition temperature of spin-orbit and Rabi coupled fermions with tunable interactions
Philip D Powell, Gordon Baym, C. A. R. Sa de Melo
We obtain the superfluid transition temperature of equal Rashba-Dresselhaus spin-orbit and Rabi coupled Fermi superfluids, from the Bardeen-Cooper-Schrieffer (BCS) to Bose-Einstein…
Ultrarelativistic heavy ion collisions: the first billion seconds
Gordon Baym
I first review the early history of the ultrarelativistic heavy ion program, starting with the 1974 Bear Mountain Workshop, and the 1983 Aurora meeting of the U.S. Nuclear Science…
The Golden Era of Neutron Stars: from Hadrons to Quarks
Gordon Baym
Neutron stars were first posited in the early thirties, and discovered as pulsars in late sixties; however, only recently are we beginning to understand the matter they contain. Th…
Finite Temperature Collapse of a Bose Gas with Attractive Interactions (extended version)
Erich J. Mueller, Gordon Baym
We study the mechanical stability of the weakly interacting Bose gas with attractive interactions, and construct a unified picture of the collapse valid from the low temperature co…
Bose-Einstein condensates in toroidal traps: instabilities, swallow-tail loops, and self-trapping
Soheil Baharian, Gordon Baym
We study the stability and dynamics of an ultra-cold bosonic gas trapped in a toroidal geometry and driven by rotation, in the absence of dissipation. We first delineate, via the B…
The physics of Hanbury Brown--Twiss intensity interferometry: from stars to nuclear collisions
Gordon Baym
In the 1950's Hanbury Brown and Twiss showed that one could measure the angular sizes of astronomical radio sources and stars from correlations of signal intensities, rather than a…
Polarization of Direct Photons from Gluon Anisotropy in Ultrarelativistic Heavy Ion Collisions
Gordon Baym, Tetsuo Hatsuda
We show how anisotropy in momentum of the gluon distribution in ultrarelativistic heavy ion collisions gives rise to polarization of direct photons produced via gluon-quark Compton…
Ground-state phases of ultracold bosons with Rashba-Dresselhaus spin-orbit coupling
Tomoki Ozawa, Gordon Baym
We study ultracold bosons in three dimensions with an anisotropic Rashba-Dresselhaus spin-orbit coupling. We first carry out the exact summation of ladder diagrams for the two-boso…
Tkachenko modes of vortex lattices in rapidly rotating Bose-Einstein condensates
Gordon Baym
We calculate the in-plane modes of the vortex lattice in a rotating Bose condensate from the Thomas-Fermi to the mean-field quantum Hall regimes. The Tkachenko mode frequency goes…
Landau levels and the Thomas-Fermi structure of rapidly rotating Bose-Einstein condensates
Gentaro Watanabe, Gordon Baym, C. J. Pethick
We show that, within mean-field theory, the density profile of a rapidly rotating harmonically trapped Bose-Einstein condensate is of the Thomas-Fermi form as long as the number of…
The transition temperature of the dilute interacting Bose gas
Gordon Baym, Jean-Paul Blaizot, Markus Holzmann +2
We show that the critical temperature of a uniform dilute Bose gas must increase linearly with the s-wave scattering length describing the repulsion between the particles. Because…
New Critical Point Induced by the Axial Anomaly in Dense QCD
Tetsuo Hatsuda, Motoi Tachibana, Naoki Yamamoto +1
We study the interplay between chiral and diquark condensates within the framework of the Ginzburg-Landau free energy, and classify possible phase structures of two and three-flavo…
Condensation transition of ultracold Bose gases with Rashba spin-orbit coupling
Tomoki Ozawa, Gordon Baym
We study the Bose-Einstein condensate phase transition of three-dimensional ultracold bosons with isotropic Rashba spin-orbit coupling. Investigating the structure of Ginzburg-Land…
Renormalization of interactions of ultracold atoms in simulated Rashba gauge fields
Tomoki Ozawa, Gordon Baym
Interactions of ultracold atoms with Rashba spin-orbit coupling, currently being studied with simulated (artificial) gauge fields, have nontrivial ultraviolet and infrared behavior…
Absence of Fragmentation and Broken Spatial Symmetry in the Ground State of Dilute Bose Gases
Tin-Lun Ho, Gordon Baym
Paper temporarily withdrawn for remodeling
Vortex lattice stability and phase coherence in three-dimensional rapidly rotating Bose condensates
S. Andrew Gifford, Gordon Baym
We establish the general equations of motion for the modes of a vortex lattice in a rapidly rotating Bose-Einstein condensate in three dimensions, taking into account the elastic e…
Fluctuations and correlations in rotating Bose-Einstein condensates
Soheil Baharian, Gordon Baym
We investigate the effects of correlations on the properties of the ground state of the rotating harmonically-trapped Bose gas by adding Bogoliubov fluctuations to the mean-field g…
Antiferrosmectic ground state of two-component dipolar Fermi gases -- an analog of meson condensation in nuclear matter
Kenji Maeda, Tetsuo Hatsuda, Gordon Baym
We show that an antiferrosmectic-C phase has lower energy at high densities than the non-magnetized Fermi gas and ferronematic phases in an ultracold gas of fermionic atoms, or mol…
Fragmentation of Bose-Einstein Condensates
Erich J. Mueller, Tin-Lun Ho, Masahito Ueda +1
We present the theory of bosonic systems with multiple condensates, unifying disparate models which are found in the literature, and discuss how degeneracies, interactions, and sym…
Evolution of Primordial Neutrino Helicities in Cosmic Gravitational Inhomogeneities
Gordon Baym, Jen-Chieh Peng
Relic neutrinos from the Big Bang decoupled from the hot plasma predominantly in helicity eigenstates. Their subsequent propagation through gravitational inhomogeneities of the Uni…
Condensate density and superfluid mass density of a dilute Bose gas near the condensation transition
Markus Holzmann, Gordon Baym
We derive, through analysis of the structure of diagrammatic perturbation theory, the scaling behavior of the condensate and superfluid mass density of a dilute Bose gas just below…
Structure of vortices in rotating Bose-Einstein condensates
Gentaro Watanabe, S. Andrew Gifford, Gordon Baym +1
We calculate the structure of individual vortices in rotating Bose-Einstein condensates in a transverse harmonic trap. Making a Wigner-Seitz approximation for the unit cell of the…
Evolution of Primordial Neutrino Helicities in Astrophysical Magnetic Fields and Implications for their Detection
Gordon Baym, Jen-Chieh Peng
Since decoupling in the early universe in helicity states, primordial neutrinos propagating in astrophysical magnetic fields precess and undergo helicity changes. In view of the XE…
Understanding the puzzle of angular momentum conservation in beta decay and related processes
Gordon Baym, Jen-Chieh Peng, C. J. Pethick
We ask the question of how angular momentum is conserved in electroweak interaction processes. To introduce the problem with a minimum of mathematics, we first raise the same issue…
Astrophysical Measurement of the Equation of State of Neutron Star Matter
Feryal Ozel, Gordon Baym, Tolga Guver
We present the first astrophysical measurement of the pressure of cold matter above nuclear saturation density, based on recently determined masses and radii of three neutron stars…
Superfluid phases of quark matter, II: Phenomenology and sum rules
Kei Iida, Gordon Baym
We derive sum rules for a uniform, isotropic superfluid quark-gluon plasma with massless quarks, first laying out the phenomenological equations obeyed by a color superconductor in…
The axial anomaly and the phases of dense QCD
Gordon Baym, Tetsuo Hatsuda, Motoi Tachibana +1
The QCD axial anomaly, by coupling the chiral condensate and BCS pairing fields of quarks in dense matter, leads to a new critical point in the QCD phase diagram \cite{HTYB,chiral2…
Long Range Plan: Dense matter theory for heavy-ion collisions and neutron stars
Alessandro Lovato, Travis Dore, Robert D. Pisarski +61
Since the release of the 2015 Long Range Plan in Nuclear Physics, major events have occurred that reshaped our understanding of quantum chromodynamics (QCD) and nuclear matter at l…
The quantum mechanics of particle-correlation measurements in high-energy heavy-ion collisions
Alejandro Ayala, Gordon Baym, James L. Popp
The Hanbury Brown--Twiss (HBT) effect in two-particle correlations is a fundamental wave phenomenon that occurs at the sensitive elements of detectors; it is one of the few process…
Coherence and clock shifts in ultracold Fermi gases with resonant interactions
Gordon Baym, C. J. Pethick, Zhenhua Yu +1
Using arguments based on sum rules, we derive a general result for the average shifts of rf lines in Fermi gases in terms of interatomic interaction strengths and two-particle corr…
Damping of gravitational waves by matter
Gordon Baym, Subodh P. Patil, C. J. Pethick
We develop a unified description, via the Boltzmann equation, of damping of gravitational waves by matter, incorporating collisions. We identify two physically distinct damping mec…
Vortex states of rapidly rotating dilute Bose-Einstein condensates
Uwe R. Fischer, Gordon Baym
We show that, in the Thomas-Fermi regime, the cores of vortices in rotating dilute Bose-Einstein condensates adjust in radius as the rotation velocity, , grows, thus precluding…
Superfluid phases of quark matter. III. Supercurrents and vortices
Kei Iida, Gordon Baym
We study, within Ginzburg-Landau theory, the responses of three-flavor superfluid quark-gluon plasmas to external magnetic fields and rotation, in both the color-flavor locked and…
Biographical Memoir of Stirling Colgate
W. David Arnett, Gordon Baym, Necia +1
Stirling Colgate was a remarkably imaginative physicist, an independent thinker with a wide breadth of interests and contagious enthusiasm, a born leader with enduring drive to att…
Short-range correlations and entropy in ultracold atomic Fermi gases
Zhenhua Yu, Georg M. Bruun, Gordon Baym
We relate short-range correlations in ultracold atomic Fermi gases to the entropy of the system over the entire temperature, , vs. coupling strength, , plane. In the lo…
Ground-State Properties of Magnetically Trapped Bose-Condensed Rubidium Gas
Gordon Baym, Christopher Pethick
We give a quantitative account of the ground-state properties of the dilute magnetically trapped Rb gas recently cooled and Bose-Einstein condensed at nanokelvin-scale tempe…
Non-uniform vortex lattices in inhomogeneous rotating Bose-Einstein condensates
Gordon Baym, C. J. Pethick, S. Andrew Gifford +1
We derive a general framework, in terms of elastic theory, for describing the distortion of the vortex lattice in a rotating Bose-Einstein condensate at arbitrary rotation speed an…
Cold quantum gases: coherent quantum phenomena from Bose-Einstein condensation to BCS pairing of fermions
Gordon Baym
Studies of trapped quantum gases of bosons and of fermions have opened up a new range of many-body problems, having a strong overlap with nuclear and neutron star physics. Topics d…
Finite size scaling and the role of the thermodynamic ensemble in the transition temperature of a dilute Bose gas
Erich J. Mueller, Gordon Baym, Markus Holzmann
We study the Bose-Einstein condensation phase transition in a weakly interacting gas through a perturbative analysis of finite systems. In both the grand canonical and the canonica…
Effective repulsion in dense quark matter from non-perturbative gluon exchange
Yifan Song, Gordon Baym, Tetsuo Hatsuda +1
A moderately strong vector repulsion between quarks in dense quark matter is needed to explain how a quark core can support neutron stars heavier than two solar masses. We study th…
Thermal fluctuations of gauge fields and first order phase transitions in color superconductivity
Taeko Matsuura, Kei Iida, Tetsuo Hatsuda +1
We study the effects of thermal fluctuations of gluons and the diquark pairing field on the superconducting-to-normal state phase transition in a three-flavor color superconductor,…
Bose-Einstein transition in a dilute interacting gas
Gordon Baym, Jean-Paul Blaizot, Markus Holzmann +2
We study the effects of repulsive interactions on the critical density for the Bose-Einstein transition in a homogeneous dilute gas of bosons. First, we point out that the simple m…
The Electrical Conductivity in the Early Universe
Gordon Baym, H. Heiselberg
We calculate the electrical conductivity in the early universe at temperatures below as well as above the electroweak vacuum scale, GeV. Debye and dynamical screenin…
Fine structure of excitons in CuO
G. M. Kavoulakis, Yia-Chung Chang, Gordon Baym
Three experimental observations on 1s-excitons in CuO are not consistent with the picture of the exciton as a simple hydrogenic bound state: the energies of the 1s-excitons dev…
The Kosterlitz-Thouless-Berezinskii transition of homogeneous and trapped Bose gases in two dimensions
Markus Holzmann, Gordon Baym, Jean-Paul Blaizot +1
We derive the scaling structure of the Kosterlitz-Thouless-Berezinskii (KTB) transition temperature of a homogeneous Bose gas in two dimensions within diagrammatic perturbation the…
Macroscopic neutrinoless double beta decay: long range quantum coherence
Gordon Baym, Jen-Chieh Peng
We re-introduce, in light of our modern understanding of neutrinos, the concept of ``macroscopic neutrinoless double beta decay" (MDBD) for Majorana neutrinos. In this process an a…
Auger decay of degenerate and Bose-condensed excitons in CuO
G. M. Kavoulakis, Gordon Baym
We study the non-radiative Auger decay of excitons in CuO, in which two excitons scatter to an excited electron and hole. The exciton decay rate for the direct and the phonon-a…
Phenomenological QCD equations of state for neutron stars
Toru Kojo, Philip D. Powell, Yifan Song +1
We delineate the properties of QCD matter at baryon density n_B=1-10n_0 (n_0: nuclear saturation density), through the construction of neutron star equations of state that satisfy…
Low Temperature Transport Properties of Very Dilute Classical Solutions of He in Superfluid He
Gordon Baym, D. H. Beck, C. J. Pethick
We report microscopic calculations of the thermal conductivity, diffusion constant and thermal diffusion constant for classical solutions of He in superfluid He at temperat…
The Maximum Mass of a Neutron Star
Vassiliki Kalogera, Gordon Baym
Observational identification of black holes as members of binary systems requires the knowledge of the upper limit on the gravitational mass of a neutron star. We use modern equati…
The Dense Matter Equation of State from Neutron Star Radius and Mass Measurements
Feryal Ozel, Dimitrios Psaltis, Tolga Guver +3
We present a comprehensive study of spectroscopic radius measurements of twelve neutron stars obtained during thermonuclear bursts or in quiescence. We incorporate, for the first t…
From hadrons to quarks in neutron stars: a review
Gordon Baym, Tetsuo Hatsuda, Toru Kojo +3
We review the equation of state of matter in neutron stars from the solid crust through the liquid nuclear matter interior to the quark regime at higher densities. We focus in deta…
Hanbury Brown--Twiss interferometry with electrons: Coulomb vs. quantum statistics
Gordon Baym, Kan Shen
A longstanding goal of Akira Tonomura was to observe Hanbury Brown--Twiss anti-correlations between electrons in a field-emission free electron beam. The experimental results were…
Vortex lattices in rapidly rotating Bose-Einstein condensates: modes and correlation functions
Gordon Baym
After delineating the physical regimes which vortex lattices encounter in rotating Bose-Einstein condensates as the rotation rate, , increases, we derive the normal modes of th…
The superfluid phases of quark matter: Ginzburg-Landau theory and color neutrality
Kei Iida, Gordon Baym
We apply Ginzburg-Landau theory to determine BCS pairing in a strongly-coupled uniform superfluid of three-flavor massless quarks in flavor equilibrium. We elucidate the phase diag…
Phenomenological QCD equation of state for massive neutron stars
Toru Kojo, Philip D. Powell, Yifan Song +1
We construct an equation of state for massive neutron stars based on quantum chromodynamics phenomenology. Our primary purpose is to delineate the relevant ingredients of equations…
Stability of the vortex lattice in a rotating superfluid
Gordon Baym
We analyze the stability of the vortex lattice in a rotating superfluid against thermal fluctuations associated with the long-wavelength Tkachenko modes of the lattice. Inclusion o…
Transport in very dilute solutions of He in superfluid He
Gordon Baym, D. H. Beck, C. J. Pethick
Motivated by a proposed experimental search for the electric dipole moment of the neutron (nEDM) utilizing neutron-He capture in a dilute solution of He in superfluid …
Self-consistent approximations: application to a quasiparticle description of the thermodynamic properties of relativistic plasmas
Benoit Vanderheyden, Gordon Baym
We generalize the concept of conserving,Φ-derivable, approximations to relativistic field theories. Treating the interaction field as a dynamical degree of freedom, we derive the…
Landau critical velocity in weakly interacting Bose gases
Gordon Baym, C. J. Pethick
The flow of a uniform Bose gas at speeds greater than the Landau critical velocity, v_c, does not necessarily destroy superfluidity, but rather need only lead to a decrease of the…
Spin-correlation functions in ultracold paired atomic-fermion systems: sum rules, self-consistent approximations, and mean fields
Zhenhua Yu, Gordon Baym
The spin response functions measured in multi-component fermion gases by means of rf transitions between hyperfine states are strongly constrained by the symmetry of the interatomi…
Self-consistent approximations in relativistic plasmas: Quasiparticle analysis of the thermodynamic properties
Benoit Vanderheyden, Gordon Baym
We generalize the concept of conserving, Phi-derivable, approximations to relativistic field theories. Treating the interaction field as a dynamical degree of freedom, we derive th…
New Neutron Star Equation of State with Quark-Hadron Crossover
Gordon Baym, Shun Furusawa, Tetsuo Hatsuda +2
We present a much improved equation of state for neutron star matter, QHC19, with a smooth crossover from the hadronic regime at lower densities to the quark regime at higher densi…
The transition temperature of the dilute interacting Bose gas for internal degrees of freedom
Gordon Baym, Jean-Paul Blaizot, Jean Zinn-Justin
We calculate explicitly the variation of the Bose-Einstein condensation temperature induced by weak repulsive two-body interactions to leading order in the interactio…
Non-analytic dependence of the transition temperature of the homogeneous dilute Bose gas on scattering length
Markus Holzmann, Gordon Baym, Jean-Paul Blaizot +1
We show that the shift in the transition temperature of the dilute homogeneous Bose gas is non-analytic in the scattering amplitude, . The first correction beyond the positive l…
Generalized Beth--Uhlenbeck entropy formula from the derivable approach
David Blaschke, Gerd Röpke, Gordon Baym
We derive a generalized Beth-Uhlenbeck formula for the entropy of a dense fermion system with strong two-particle correlations, including scattering states and bound states. We wor…
RHIC: From dreams to beams in two decades
Gordon Baym
This talk traces the history of RHIC over the last two decades, reviewing the scientific motivations underlying its design, and the challenges and opportunities the machine present…
Inverse Tritium Beta Decay with Relic Neutrinos, Solar Neutrinos, and a 51Cr Source
Jen-Chieh Peng, Gordon Baym
The inverse tritium beta decay (ITBD) reaction, H He, is a promising experimental tool for observing relic neutrinos created in the early Universe. This re…
Calculating energy shifts in terms of phase shifts
Zhenhua Yu, Gordon Baym, C. J. Pethick
To clarify the relation of energy shifts to scattering phase shifts in one-body and many-body problems, we examine their relation in a number of different situations. We derive, fo…
Rapidly rotating Bose-Einstein condensates in anharmonic potentials
George Kavoulakis, Gordon Baym
Rapidly rotating Bose-Einstein condensates confined in anharmonic traps can exhibit a rich variety of vortex phases, including a vortex lattice, a vortex lattice with a hole, and a…
Neutron stars and quark matter
Gordon Baym
Recent observations of neutron star masses close to the maximum predicted by nucleonic equations of state begin to challenge our understanding of dense matter in neutron stars, and…
Resolution of the hyperfine puzzle and its significance for two fermion Dirac atoms
Gordon Baym, Glennys Farrar
The hyperfine interaction in the ground state of a hydrogen atom of assumed radius is proportional to , raising the question of why the hyperfine interaction does not l…
Quantum saturation and condensation of excitons in CuO: a theoretical study
G. M. Kavoulakis, Gordon Baym, J. P. Wolfe
Recent experiments on high density excitons in CuO provide evidence for degenerate quantum statistics and Bose-Einstein condensation of this nearly ideal gas. We model the time…
Correlations and Fluctuations in High-Energy Nuclear Collisions
Gordon Baym, B. Blättel, L. L. Frankfurt +2
Nucleon correlations in the target and projectile nuclei are shown to reduce significantly the fluctuations in multiple nucleon-nucleon collisions, total multiplicity and transvers…
Elementary quantum mechanics of the neutron with an electric dipole moment
Gordon Baym, D. H. Beck
The neutron, in addition to possibly having a permanent electric dipole moment as a consequence of violation of time-reversal invariance, develops an induced electric dipole moment…
Lev Landau and the conception of neutron stars
Dmitry G. Yakovlev, Pawel Haensel, Gordon Baym +1
We review the history of neutron star physics in the 1930s that is related to L. Landau. According to recollections of Rosenfeld (1974, Proc. 16th Solvay Conference on Physics, p.…
Asymmetric pairing of realistic mass quarks and color neutrality in the Polyakov--Nambu--Jona-Lasinio model of QCD
Philip D. Powell, Gordon Baym
We investigate the effects of realistic quark masses and local color neutrality on quark pairing in the three-flavor Polyakov--Nambu--Jona-Lasinio model. While prior studies have i…
Correlations in lowest Landau level vortex states
Soheil Baharian, Gordon Baym
We show how the configuration-space form of the Bogoliubov ground state wave function of a bosonic condensate with a single vortex in a harmonic trap can be described in terms of b…
Implications of NICER for neutron star matter: the QHC21 equation of state
Toru Kojo, Gordon Baym, Tetsuo Hatsuda
The recent NICER measurement of the radius of the neutron star PSR J0740+6620, and the inferred small variation of radii from 1.4 to 2.1, reveal key features of t…
Color screening in cold quark matter
Toru Kojo, Gordon Baym
We compute---at finite quark chemical potentials---the color screening of cold quark matter at the one-loop level, comparing the normal, BCS-paired U(1)em (or Higgs) phase and a si…
BEC-BCS crossover driven by the axial anomaly in the NJL model
Hiroaki Abuki, Gordon Baym, Tetsuo Hatsuda +1
We study the QCD phase structure in the three-flavor Nambu--Jona-Lasinio model, incorporating the chiral-diquark interplay due to the axial anomaly. We demonstrate that for a certa…
Population imbalance and pairing in the BCS-BEC crossover of three-component ultracold fermions
Tomoki Ozawa, Gordon Baym
We investigate the phase diagram and the BCS-BEC crossover of a homogeneous three-component ultracold Fermi gas with a U(3) invariant attractive interaction. We show that the syste…
Velocity of vortices in inhomogeneous Bose-Einstein condensates
Halvor M. Nilsen, Gordon Baym, C. J. Pethick
We derive, from the Gross-Pitaevskii equation, an exact expression for the velocity of any vortex in a Bose-Einstein condensate, in equilibrium or not, in terms of the condensate w…
Bragg Spectroscopy of Cold Atomic Fermi Gases
G. M. Bruun, Gordon Baym
We propose a Bragg spectroscopy experiment to measure the onset of superfluid pairing in ultracold trapped Fermi gases. In particular, we study two component Fermi gases in the wea…
Striped states in weakly trapped ultracold Bose gases with Rashba spin-orbit coupling
Tomoki Ozawa, Gordon Baym
The striped state of ultracold bosons with Rashba spin-orbit coupling in a homogeneous infinite system has, as we show, a constant particle flow, which in a finite-size system woul…
Vortex core structure and global properties of rapidly rotating Bose-Einstein condensates
Gordon Baym, C. J. Pethick
We develop an approach for calculating stationary states of rotating Bose-Einstein condensates in harmonic traps which is applicable for arbitrary ratios of the rotation frequency…
Rapidly rotating Bose condensates
Gordon Baym
How does a rapidly rotating condensed Bose gas carry extreme amounts of angular momentum? The energetically favored state of a not-too-rapidly rotating Bose condensed gas is, as ob…