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Title: Bulk and isospin instabilities in hot nuclear matter

Authors:
;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1357314
Grant/Contract Number:
DOE-FG03-93ER40773
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 95; Journal Issue: 5; Related Information: CHORUS Timestamp: 2017-05-16 22:12:16; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Kolomietz, V. M., and Shlomo, S.. Bulk and isospin instabilities in hot nuclear matter. United States: N. p., 2017. Web. doi:10.1103/PhysRevC.95.054613.
Kolomietz, V. M., & Shlomo, S.. Bulk and isospin instabilities in hot nuclear matter. United States. doi:10.1103/PhysRevC.95.054613.
Kolomietz, V. M., and Shlomo, S.. Tue . "Bulk and isospin instabilities in hot nuclear matter". United States. doi:10.1103/PhysRevC.95.054613.
@article{osti_1357314,
title = {Bulk and isospin instabilities in hot nuclear matter},
author = {Kolomietz, V. M. and Shlomo, S.},
abstractNote = {},
doi = {10.1103/PhysRevC.95.054613},
journal = {Physical Review C},
number = 5,
volume = 95,
place = {United States},
year = {Tue May 16 00:00:00 EDT 2017},
month = {Tue May 16 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevC.95.054613

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  • We apply the variational theory for fermions at finite temperature and high density, developed in an earlier paper, to symmetric nuclear matter and pure neutron matter. This extension generalizes to finite temperatures, the many body technique used in the construction of the zero temperature Akmal-Pandharipande-Ravenhall equation of state. We discuss how the formalism can be used for practical calculations of hot dense matter. Neutral pion condensation along with the associated isovector spin longitudinal sum rule is analyzed. The equation of state is calculated for temperatures less than 30 MeV and densities less than three times the saturation density of nuclearmore » matter. The behavior of the nucleon effective mass in medium is also discussed.« less
  • Self-consistent mean-field methods based on phenomenological Skyrme effective interactions are known to exhibit spurious spin and spin-isospin instabilities both at zero and finite temperatures when applied to homogeneous nuclear matter at the densities encountered in neutron stars and in supernova cores. The origin of these instabilities is revisited in the framework of the nuclear energy density functional theory, and a simple prescription is proposed to remove them. The stability of several Skyrme parametrizations is reexamined.
  • We study the in-medium masses of the charmonium states J/{psi} and {eta}{sub c} in the nuclear medium using the QCD sum rule approach. These mass modifications arise owing to modifications of the scalar and the twist-2 gluon condensates in the hot hadronic matter. The scalar gluon condensate <({alpha}{sub s}/{pi})G{sub {mu}{nu}}{sup a}G{sup a{mu}{nu}>} and the twist-2 tensorial gluon operator <({alpha}{sub s}/{pi})G{sub {mu}{sigma}}{sup a}G{sup a}{sub {nu}}{sup {sigma}>} in the nuclear medium are calculated from the medium modification of a scalar dilaton field introduced to incorporate trace anomalies of QCD within the chiral SU(3) model used in the present investigation. The effects ofmore » isospin asymmetry, density, and temperature of the nuclear medium on the in-medium masses of the lowest charmonium states J/{psi} and {eta}{sub c} mesons are investigated in the present work. The results of the present investigation are compared with the existing results on the masses of these states. The medium modifications of the masses of these charmonium states (J/{psi} and {eta}{sub c}) seem to be appreciable at high densities and should modify the experimental observables arising from the compressed baryonic matter produced in asymmetric heavy-ion collision experiments at the future facility of Facility for Antiproton and Ion Research, GSI.« less
  • We analyze the process of fragmentation in heavy-ion interactions from the viewpoint of growth of instabilities in hot expanding nuclear matter. The growth rates of modes in a medium unstable to small density perturbations of finite wavelength are calculated from a kinetic equation. This enables us to treat the case where the nucleon mean free path is comparable to or greater than the wavelength of the fluctuation, and the temperature is arbitrary. We estimate for hot nuclear matter the initial conditions which, after expansion, will result in fragmentation, evaporation, or vaporization.
  • Direct URCA processes, occurring in neutron-star matter with a proton fraction exceeding the critical value of (11--15)%, can strongly enhance the bulk viscosity of the matter.