Neutron Stars with Bose-Einstein Condensation of Antikaons as MIT Bags

다국어 초록 (Multilingual Abstract)

We investigate the properties of an antikaon in medium, regarding it as a MIT bag. We first
construct the MIT bag model for a kaon with σ* and in order to describe the interaction of
s-quarks in hyperonic matter in the framework of the modied quark-meson coupling model. The
coupling constant g0BK in the density-dependent bag constant B(σ) is treated as a free parameter
to reproduce the optical potential of a kaon in a symmetric matter and all other couplings are
determined by using SU(6) symmetry and the quark counting rule. With various values of the kaon
potential, we calculate the effective mass of a kaon in medium to compare it with that of a point-like
kaon. We then calculate the population of octet baryons, leptons and K- and the equation of state
for neutron star matter. The results show that kaon condensation in hyperonic matter is sensitive
to the s-quark interaction and also to the way of treating the kaon. The mass and the radius of a
neutron star are obtained by solving the Tolmann-Oppenheimer-Volkoff equation.

참고문헌 (Reference)

1 Y. Akaishi, 65 : 044005-, 2002

2 S. Pal, 60 : 015802-, 1999

3 M. Sato, 659 : 107-, 2008

4 M. Agnello, 94 : 212303-, 2005

5 E. Oset, 74 : 015207-, 2006

6 V. K. Magas, 74 : 025206-, 2006

7 D. B. Kaplan, 175 : 57-, 1986

8 G. E. Brown, 66 : 2720-, 1991

9 G. E. Brown, 567 : 937-, 1994

10 T. Suzuki, 597 : 263-, 2004

11 T. Muto, 77 : 015810-, 2008

12 N. K. Glendenning, 81 : 4564-, 1998

13 N. K. Glendenning, 60 : 025803-, 1999

14 S. Banik, 64 : 055805-, 2001

15 D. P. Menezes, 72 : 035802-, 2005

16 C. Y. Ryu, 75 : 055804-, 2007

17 P. A. M. Guichon, 200 : 235-, 1988

18 S. Fleck, 510 : 731-, 1990

19 X. Jin, 54 : 1427-, 1996

20 K. Tsushima, 630 : 691-, 1998

21 K. Tsushima, 429 : 239-, 1998

22 C. Y. Ryu, 72 : 045206-, 2005

23 Chang-Hwan Lee, "Double Neutron Star Binaries: Implications for LIGO" 한국물리학회 49 (49): 803-807, 2006