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We explore how the dilepton production rate is modified near the critical temperature of color superconductivity and QCD critical point by the soft modes inherently associated with the phase transitions of second-order. It is shown that the…

High Energy Physics - Phenomenology · Physics 2023-03-22 Toru Nishimura , Masakiyo Kitazawa , Teiji Kunihiro

We investigate modification of the dilepton production rate by the diquark fluctuations that form well-developed collective modes near the critical temperature of color superconductivity. Through the analysis of the photon self-energy…

High Energy Physics - Phenomenology · Physics 2021-10-15 Toru Nishimura , Masakiyo Kitazawa , Teiji Kunihiro

We study how the dilepton production rates and electric conductivity are affected by the phase transition to color superconductivity and the QCD critical point. Effects of the soft modes associated with these phase transitions are…

High Energy Physics - Phenomenology · Physics 2023-12-18 Toru Nishimura , Masakiyo Kitazawa , Teiji Kunihiro

We give a systematic account of the soft mode dynamics of QCD critical point and the two-flavor color-superconductivity based on the 2-flavor Nambu--Jona-Lasinio model, and investigate their effects on electromagnetic observables in…

High Energy Physics - Phenomenology · Physics 2026-05-22 Masakiyo Kitazawa , Teiji Kunihiro

We study the quark spectrum at nonzero temperature and density near the critical point (CP) of the chiral phase transition incorporating effects of the scalar- and pseudoscalar-density fluctuations in a chiral effective model with a nonzero…

High Energy Physics - Phenomenology · Physics 2015-01-07 Masakiyo Kitazawa , Teiji Kunihiro , Yukio Nemoto

We explore the quark properties at finite temperature near but above the critical temperature of the chiral phase transition. We investigate the effects of the precursory soft mode of the phase transition on the quark dispersion relation…

High Energy Physics - Phenomenology · Physics 2009-11-11 Masakiyo Kitazawa , Teiji Kunihiro , Yukio Nemoto

The mean-field level calculation shows that the QCD matter can have multiple critical points incorporating the color superconductivity under charge neutrality constraint due to the repulsive vector interaction; this actually implies that…

Nuclear Theory · Physics 2011-03-10 T. Kunihiro , Y. Minami , Z. Zhang

We investigate fluctuation effects of a gap parameter in color-superconductors. The fluctuation modes in the super phase are described by two scalar fields of diquarks. One of them is a Nambu-Goldstone boson and the other is a diquark boson…

High Energy Physics - Phenomenology · Physics 2009-11-07 M. Iwasaki , K. Yamaguchi , O. Miyamura

We compute the modification of the photon self-energy due to dynamical diquark fluctuations developed near the critical temperature of the color superconductivity through the Aslamasov-Larkin, Maki-Thompson and density of states terms,…

High Energy Physics - Phenomenology · Physics 2022-01-07 Toru Nishimura , Masakiyo Kitazawa , Teiji Kunihiro

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…

High Energy Physics - Phenomenology · Physics 2009-11-11 Masakiyo Kitazawa , Tomoi Koide , Teiji Kunihiro , Yukio Nemoto

We investigate the quark spectrum near but above the critical temperature of the chiral transition, taking into account the precursory soft modes. It is found that there appear novel excitation spectra of quasi-quarks and quasi-antiquarks…

High Energy Physics - Phenomenology · Physics 2007-06-20 Yukio Nemoto , Masakiyo Kitazawa , Teiji Kunihiro

We show how the quasiparticle picture of quarks changes near but above the critical temperature T_c of the color-superconducting phase transition in the heated quark matter. We demonstrate that a non-Fermi liquid behavior of the matter…

High Energy Physics - Phenomenology · Physics 2009-11-11 Masakiyo Kitazawa , Teiji Kunihiro , Yukio Nemoto

We investigate the quark spectrum in the quark-gluon plasma phase near color superconducting (CS) and chiral phase transitions. Owing to the precursory soft modes of the phase transitions, there appear novel excitaion spectra: In the CS…

High Energy Physics - Phenomenology · Physics 2008-11-26 Yukio Nemoto , Masakiyo Kitazawa , Tomoi Koide , Teiji Kunihiro

Thermal fluctuations of the color superconducting order parameter in dense quark matter are investigated in terms of the phenomenological Ginzburg - Landau approach. Our estimates show that fluctuations of the di-quark gap may strongly…

Nuclear Theory · Physics 2007-05-23 D. N. Voskresensky

We study how the quasiparticle picture of the quark can be modified near but above the critical tempearture (Tc) of the chiral phase transition; we incorporate into the quark self-energy the effects of the precursory soft modes of the phase…

High Energy Physics - Phenomenology · Physics 2009-11-11 Masakiyo Kitazawa , Teiji Kunihiro , Yukio Nemoto

We investigate whether the soft mode that becomes massless at the QCD critical point (CP) causes an enhancement of the dilepton production rate (DPR) and the electric conductivity around the CP through the modification of the photon…

High Energy Physics - Phenomenology · Physics 2023-02-08 Toru Nishimura , Masakiyo Kitazawa , Teiji Kunihiro

Fluctuations of the color superconducting order parameter in dense quark matter at finite temperatures are investigated in terms of the phenomenological Ginzburg - Landau approach. Our estimates show that fluctuations of the di-quark gap…

Nuclear Theory · Physics 2009-11-10 D. N. Voskresensky

Near the critical temperature of the chiral phase transition, a collective excitation due to fluctuation of the chiral order parameter appears. We investigate how it affects the quark spectrum near but above the critical temperature. The…

High Energy Physics - Phenomenology · Physics 2007-05-23 Masakiyo Kitazawa , Teiji Kunihiro , Yukio Nemoto

We study the superconducting order parameter fluctuations near the phase transition into the Larkin-Ovchinnikov-Fulde-Ferrell state in the clean limit at zero temperature. In contrast to the usual normal metal-to-uniform superconductor…

Superconductivity · Physics 2009-11-11 K. V. Samokhin , M. S. Mar'enko

Type-I color superconductors display a first-order phase transition due to thermal gauge-field fluctuations. We numerically evaluated the critical temperature of the first-order phase transition and the corresponding discontinuity of the…

Nuclear Theory · Physics 2009-11-11 Jorge L. Noronha , Hai-cang Ren , Ioannis Giannakis , Defu Hou , Dirk H. Rischke
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