Journal ArticleDOI
Relativistic fermion gas interacting through a scalar field. I. Hartree approximation
TLDR
In this article, a high-density fermion gas interacting through a scalar field is studied in the relativistic Hartree approximation, as a model for superhigh-density astrophysical systems.Abstract:
A high-density fermion gas interacting through a scalar field is studied in the relativistic Hartree approximation, as a model for superhigh-density astrophysical systems The Hartree quasiparticle states are the superposition of positive- and negative-energy states and can be constructed by a Bogoliubov-type canonical transformation The resulting effective mass is strongly field-dependent, and approaches 0 as the density increases into the ultrarelativistic domain The ensuing equation of state exhibits a phase transition and a bound state in the intermediate-density range, but becomes perfect-gas-like at high densities There is no collapse, and stronger coupling enhances the perfect-gas-like behavior An alternate picture is provided by considering the fermion gas in the background of zero-momentum bosons Numerical comparisons with existing scalar-meson coupling data are provided, with emphasis on regions of neutron-star densitiesread more
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Journal ArticleDOI
A relativistic many-body theory of high density matter.
TL;DR: In this article, a relativistic quantum many-body theory is applied to the study of high-density matter, where baryons are described as interacting with each other via massive scalar and massive vector meson exchange.
Journal ArticleDOI
On the formalism of relativistic many body theory
TL;DR: In this paper, the thermodynamic potential is constructed as an effective action functional of the various n point amplitudes (n less than or equal to 4), which is used to obtain the equations of state as simple, convergent expressions involving the conventionally renormalized charges and masses.
Journal ArticleDOI
Temperature Dependence of the Dynamical Structure of Expanded Liquid Rubidium
TL;DR: In this article, the authors investigated the temperature dependence of the dynamical structure, in particular the dispersion relation of the collective excitation, of expanded liquid rubidium on the basis of the effective pair potential derived by the pseudopotential theory, the static structure factor calculated in the modified hypernetted-chain (MHNC) approximation and the dynamic structure factor in the viscoelastic approximation.
Journal ArticleDOI
Sub-picosecond dynamics in liquid Si
Shinya Hosokawa,Wolf Christian Pilgrim,Yukinobu Kawakita,K. Ohshima,S. Takeda,Daisuke Ishikawa,Satoshi Tsutsui,Yoshikazu Tanaka,Alfred Q. R. Baron +8 more
TL;DR: In this paper, the authors measured the dynamic structure factor S(Q,ω) of liquid Si close to melting using high-resolution inelastic x-ray scattering and demonstrated the existence of propagating short wavelength modes in the melt with a Q-ω relation similar to those in other liquid metal systems.
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