München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 11: Theorie

HK 11.1: Vortrag

Montag, 20. März 2006, 16:30–16:45, B

Stability of color-superconducting strangelets — •Osamu Kiriyama — Institut fuer Theoretische Physik, J.W. Goethe-Universitaet, 60438 Frankfurt am Main, Germany

The two-flavor color-superconducting (2SC) phase in small ($A ∖ll 10^7$) strangelets is studied [1]. In such small strangelets, electrons mainly stay outside of quark core. Therefore, in the study of the quark core of small strangelets, the (local) electric neutrality condition can be neglected, but finite-size effects should be included instead. Consequently, the phase structure of small strangelets could be different from that of strange quark matter in bulk.

In order to describe the 2SC phase we use the three-flavor Nambu–Jona-Lasinio model. We explicitly take into account finite size effects by making use of the approximation for the density of states in spherical cavities called multiple reflection expansion (MRE). (The MRE density of states has been used to calculate thermodynamic quantities of strangelets and reproduced well the results of the MIT bag model [2].)

The thermodynamic potential for the 2SC strangelets is derived in the mean-field approximation with the help of the MRE. We found that 2SC phase survives in small strangelets with a sizable gap. Consequences for the 2SC phase will be also presented.

∖Zitat{1}{O. Kiriyama, Phys. Rev. D {∖bf 72}, 054009 (2005); hep-ph/0401075 (to be published in Int. J. Mod. Phys. A).} ∖Zitat{2}{M.S. Berger and R.L. Jaffe, Phys. Rev. C {∖bf 35}, 213 (1987); {∖bf 44}, 566(E) (1991); J. Madsen, Phys. Rev. D {∖bf 50}, 3328 (1994).}