Equation of state of hypernuclear matter: Impact of hyperon-scalar-meson couplings

被引：105
作者：
Colucci, Giuseppe [1 ]
Sedrakian, Armen [1 ]
机构：
[1] Goethe Univ Frankfurt, Inst Theoret Phys, D-60438 Frankfurt, Germany
来源：
PHYSICAL REVIEW C | 2013年 / 87卷 / 05期
关键词：
NEUTRON-STAR; HYBRID STARS; MASS; RADIUS; STRANGENESS;
D O I：
10.1103/PhysRevC.87.055806
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
We study the equation of state and composition of hypernuclear matter within a relativistic density functional theory with density-dependent couplings. The parameter space of hyperon-scalar-meson couplings is explored by allowing for mixing and breaking of SU(6) symmetry, while keeping the nucleonic coupling constants fixed. The subset of equations of state, which corresponds to small values of hyperon-scalar-meson couplings, allows for massive M <= 2.25M(circle dot) compact stars; the radii of hypernuclear stars are within the range 12-14 km. We also study the equation of state of hot neutrino-rich and neutrinoless hypernuclear matter and confirm that neutrinos stiffen the equation of state and dramatically change the composition of matter by keeping the fractions of charged leptons nearly independent of the density prior to the onset of neutrino transparency. We provide piecewise polytropic fits to six representative equations of state of hypernuclear matter, which are suitable for applications in numerical astrophysics.
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页数：10
相关论文
共 65 条
[1]  
Ambartsumyan V.A., 1960, ASTRON ZH, V37, P193
[2]   A global fit to determine the pseudoscalar mixing angle and the gluonium content of the η′ meson [J].
Ambrosino, F. ;
Antonelli, A. ;
Antonelli, M. ;
Archilli, F. ;
Beltrame, P. ;
Bencivenni, G. ;
Bertolucci, S. ;
Bini, C. ;
Bloise, C. ;
Bocchetta, S. ;
Bossi, F. ;
Branchini, P. ;
Capon, G. ;
Capussela, T. ;
Ceradini, F. ;
Ciambrone, P. ;
De Lucia, E. ;
De Santis, A. ;
De Simone, P. ;
De Zorzi, G. ;
Denig, A. ;
Di Domenico, A. ;
Di Donato, C. ;
Di Micco, B. ;
Dreucci, M. ;
Felici, G. ;
Fiore, S. ;
Franzini, P. ;
Gatti, C. ;
Gauzzi, P. ;
Giovannella, S. ;
Graziani, E. ;
Jacewicz, M. ;
Lanfranchi, G. ;
Lee-Franzini, J. ;
Martini, M. ;
Massarotti, P. ;
Meola, S. ;
Miscetti, S. ;
Moulson, M. ;
Mueller, S. ;
Murtas, F. ;
Napolitano, M. ;
Nguyen, F. ;
Palutan, M. ;
Pasqualucci, E. ;
Passeri, A. ;
Patera, V. ;
Santangelo, P. ;
Sciascia, B. .
JOURNAL OF HIGH ENERGY PHYSICS, 2009, (07)
[3]  
[Anonymous], 1999, Pulsars as Astrophysical Observatories for Nuclear and Particle Physics
[4]   A Massive Pulsar in a Compact Relativistic Binary [J].
Antoniadis, John ;
Freire, Paulo C. C. ;
Wex, Norbert ;
Tauris, Thomas M. ;
Lynch, Ryan S. ;
van Kerkwijk, Marten H. ;
Kramer, Michael ;
Bassa, Cees ;
Dhillon, Vik S. ;
Driebe, Thomas ;
Hessels, Jason W. T. ;
Kaspi, Victoria M. ;
Kondratiev, Vladislav I. ;
Langer, Norbert ;
Marsh, Thomas R. ;
McLaughlin, Maura A. ;
Pennucci, Timothy T. ;
Ransom, Scott M. ;
Stairs, Ingrid H. ;
van Leeuwen, Joeri ;
Verbiest, Joris P. W. ;
Whelan, David G. .
SCIENCE, 2013, 340 (6131) :448
[5]   Roles of hyperons in neutron stars [J].
Balberg, S ;
Lichtenstadt, I ;
Cook, GB .
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 1999, 121 (02) :515-531
[6]   Protoneutron star model with nonzero strangeness core [J].
Bednarek, I ;
Keska, M ;
Manka, R .
INTERNATIONAL JOURNAL OF MODERN PHYSICS D, 2004, 13 (02) :215-228
[7]   Compression of matter in the center of accreting neutron stars [J].
Bejger, M. ;
Zdunik, J. L. ;
Haensel, P. ;
Fortin, M. .
ASTRONOMY & ASTROPHYSICS, 2011, 536
[8]   DENSE BARYON MATTER CALCULATIONS WITH REALISTIC POTENTIALS [J].
BETHE, HA ;
JOHNSON, MB .
NUCLEAR PHYSICS A, 1974, A230 (01) :1-58
[9]   THE NEAREST MILLISECOND PULSAR REVISITED WITH XMM-NEWTON: IMPROVED MASS-RADIUS CONSTRAINTS FOR PSR J0437-4715 [J].
Bogdanov, Slavko .
ASTROPHYSICAL JOURNAL, 2013, 762 (02)
[10]   Composition and stability of hybrid stars with hyperons and quark color-superconductivity [J].
Bonanno, Luca ;
Sedrakian, Armen .
ASTRONOMY & ASTROPHYSICS, 2012, 539
1234567