Adiabatic index of hot and cold compact objects

被引：19

作者：

Casali, R. H. ^{[1
]}

Menezes, D. P. ^{[1
]}

机构：

[1] Univ Fed Santa Catarina, CFM, Dept Fis, BR-88040900 Florianopolis, SC, Brazil

来源：

BRAZILIAN JOURNAL OF PHYSICS | 2010年 / 40卷 / 02期

关键词：

Neutron stars; Quark stars; Adiabatic index; NEUTRON-STARS; MIXED-PHASE; MATTER;

D O I：

10.1590/S0103-97332010000200007

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In the present work we calculate the adiabatic index of neutron stars formed by hadronic or quarkionic matter, under two possible conditions, with and without trapped neutrinos, and for two values of the entropy per baryon S = 0, 2 k(B)/ baryon. We use the nonlinear Walecka model to describe hadronic stars, and the MIT bag model to describe quark stars. Particle fractions for each case are obtained and the appearance of particles are compared with drops in the adiabatic index, whenever possible.

引用

页码：166 / 171

页数：6

共 20 条

[1] Mixed-phase induced core-quakes and the changes in neutron-star parameters [J].

Bejger, M ;

Haensel, P ;

Zdunik, JL .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2005, 359 (02) :699-706

[2]

CASALI RH, 2008, THESIS U FEDERAL SAN

[3] The importance of strange mesons in neutron star properties [J].

Cavagnoli, R ;

Menezes, DP .

BRAZILIAN JOURNAL OF PHYSICS, 2005, 35 (3B) :869-872

[4] Warm protoneutron stars with strange mesons [J].

Cavagnoli, Rafael ;

Menezes, Debora P. .

JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, 2008, 35 (11)

[5] NEW EXTENDED MODEL OF HADRONS [J].

CHODOS, A ;

JAFFE, RL ;

JOHNSON, K ;

THORN, CB ;

WEISSKOP.VF .

PHYSICAL REVIEW D, 1974, 9 (12) :3471-3495

[6] Relativistic equations of state in a Thomas-Fermi approach for neutron stars -: art. no. 045803 [J].

Espíndola, AL ;

Menezes, DP .

PHYSICAL REVIEW C, 2002, 65 (04) :458031-458038

[7] Relativistic effects in polytropic compact stars [J].

Ferrari, L. ;

Estrela, G. ;

Malheiro, M. .

INTERNATIONAL JOURNAL OF MODERN PHYSICS E, 2007, 16 (09) :2834-2837

[8]

FERRARI L, J MOD PHY D IN PRESS

[9]

Glendenning N.K., 2000, COMPACT STARS NUCL P

[10] Analytical representations of unified equations of state of neutron-star matter [J].

Haensel, P ;

Potekhin, AY .

ASTRONOMY & ASTROPHYSICS, 2004, 428 (01) :191-197

← 1 2 →