Pre-Critical Phenomena of Two-Flavor Color Superconductivity in Heated Quark Matter : Diquark-Pair Fluctuations and Non-Fermi Liquid Behavior(Nuclear Physics)
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概要
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We investigate the fluctuations of the diquark-pair field and their effects on observables above the critical temperature T_c in two-flavor color superconductivity (CSC) at moderate density using a Nambu-Jona-Lasinio-type effective model of QCD. Because of the strong-coupling nature of the dynamics, the fluctuations of the pair field develop a collective mode, which has a prominent strength even well above T_c. We show that the collective mode is actually the soft mode of CSC. We examine the effects of the pair fluctuations on the specific heat and the quark spectrum for T above but close to T_c. We find that the specific heat exhibits singular behavior because of the pair fluctuations, in accordance with the general theory of second-order phase transitions. The quarks display a typical non-Fermi liquid behavior, owing to the coupling with the soft mode, leading to a pseudo-gap in the density of states of the quarks in the vicinity of the critical point. Some experimental implications of the precursory phenomena are also discussed.
- 理論物理学刊行会の論文
- 2005-07-25
著者
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Kunihiro T
Yukawa Institute For Theoretical Physics Kyoto University:(present Office)department Of Physics Kyot
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Kunihiro Teiji
Yukawa Institute For Theoretical Physics Kyoto Univ.
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Koide Tomoi
Instituto De Fisica Universidade Federal Do Rio De Janeiro
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Koide T
Kyoto Univ. Kyoto Jpn
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Koide Tomoi
Institute De Fisica Universidade De Sao Paulo C.p.
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Nemoto Yukio
Department Of Physics Nagoya University
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KITAZAWA Masakiyo
Yukawa Institute for Theoretical Physics, Kyoto University
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NEMOTO Yukio
RIKEN-BNL Research Center
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Tamiya Kyuichiro
Department Of Physics Kyoto University
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Kitazawa Masakiyo
Department Of Physics Osaka University
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