Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-05-30
Phys.Rev. C66 (2002) 065801
Astronomy and Astrophysics
Astrophysics
20 pages, 7 figures; final version to appear in Physical Review C
Scientific paper
10.1103/PhysRevC.66.065801
We investigate $K^-$ and $\bar K^0$ 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 potential. 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, $K^-$ condensation sets in even in the presence of negatively charged hyperons. The threshold of $\bar K^0$ 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.
Bandyopadhyay Debades
Banik Sarmistha
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