Density dependent hadron field theory for neutron stars with antikaon condensates

被引:49
|
作者
Banik, S [1 ]
Bandyopadhyay, D [1 ]
机构
[1] Saha Inst Nucl Phys, Kolkata 700064, W Bengal, India
来源
PHYSICAL REVIEW C | 2002年 / 66卷 / 06期
关键词
D O I
10.1103/PhysRevC.66.065801
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 investigate K- and (K) over bar (0) condensation in beta-equilibrated hyperonic matter within a density dependent hadron field theoretical model. In this model, baryon-baryon and (anti)kaon-baryon interactions are mediated by the exchange of mesons. Density dependent meson-baryon coupling constants are obtained from microscopic Dirac-Brueckner calculations using Groningen and Bonn A nucleon-nucleon potentials. It is found that the threshold of antikaon condensation is not only sensitive to the equation of state but also to antikaon optical potential depth. Only for large values of antikaon optical potential depth does K- condensation set in even in the presence of negatively charged hyperons. The threshold of (K) over bar (0) condensation is always reached after K- condensation. Antikaon condensation makes the equation of state softer thus resulting in smaller maximum mass stars compared with the case without any condensate.
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页数:12
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