Quark Stars in a QCD-like Effective Theory

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  • 量子色力学類似有効理論に於けるクォーク星
  • リョウシショク リキガク ルイジ ユウコウ リロン ニ オケル クォークセイ

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The spatial structure of quark Cooper pairs in two-flavor quark matter is investigated numerically within the framework of a modified QCD-like effective model, in which the lattice-QCD-based gluon propagator is used. The propagator is considered to include the nonperturbative effects in the quenched QCD. We consider β-equilibrated quark matter with electric charge neutrality condition. We find that the coherence length ε ～ 1:1 fm at low to moderate quark chemical potential (0:2 < μ < 0:7 GeV). Cooper pair is considered to be bosonic at μ < 0:4 GeV, because »=d < 1 in the region(d: interquark distance). Therefore, in the universe, the quark-Bose-Einstein condensation may exist inside some of compact stars. Furthermore, we investigate quark stars in our model. We find that, for example, at B^(1/4) =150MeV, the maximum mass is 1:92Msun and its radius is 10:61km (Msun : solar mass, B : bag constant).

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