### Abstract

We present a detailed study of the recently proposed gapless color superconductivity in neutral two-flavor quark matter in β-equilibrium at zero as well as at finite temperature. We clarify the nature of the fermionic quasiparticles, and discuss the physical properties of this gapless phase of quark matter. The appearance of two "secondary" spin-1 condensates in the gapless ground state is pointed out. The gluon screening properties are also discussed. It is found that finite temperature properties of the gapless color superconductor are rather unusual. One of the most striking results is that the ratio of the critical temperature to the gap at zero temperature is not a universal number. Moreover, this ratio could become arbitrarily large at some values of the coupling constant. In addition, the value of the gap parameter is not a monotonic function of temperature, although the phase transition is a second order phase transition. In an extreme case, in fact, a nonzero finite temperature gap can appear even if its zero temperature value is vanishing.

Original language | English (US) |
---|---|

Pages (from-to) | 835-863 |

Number of pages | 29 |

Journal | Nuclear Physics A |

Volume | 729 |

Issue number | 2-4 |

DOIs | |

State | Published - Dec 29 2003 |

Externally published | Yes |

### Fingerprint

### Keywords

- Anderson-Higgs mechanism
- Compact stars
- Dense quark matter
- Gapless color superconductor
- Meissner effect

### ASJC Scopus subject areas

- Nuclear and High Energy Physics

### Cite this

*Nuclear Physics A*,

*729*(2-4), 835-863. https://doi.org/10.1016/j.nuclphysa.2003.10.005

**Gapless color superconductivity at zero and at finite temperature.** / Huang, Mei; Shovkovy, Igor.

Research output: Contribution to journal › Article

*Nuclear Physics A*, vol. 729, no. 2-4, pp. 835-863. https://doi.org/10.1016/j.nuclphysa.2003.10.005

}

TY - JOUR

T1 - Gapless color superconductivity at zero and at finite temperature

AU - Huang, Mei

AU - Shovkovy, Igor

PY - 2003/12/29

Y1 - 2003/12/29

N2 - We present a detailed study of the recently proposed gapless color superconductivity in neutral two-flavor quark matter in β-equilibrium at zero as well as at finite temperature. We clarify the nature of the fermionic quasiparticles, and discuss the physical properties of this gapless phase of quark matter. The appearance of two "secondary" spin-1 condensates in the gapless ground state is pointed out. The gluon screening properties are also discussed. It is found that finite temperature properties of the gapless color superconductor are rather unusual. One of the most striking results is that the ratio of the critical temperature to the gap at zero temperature is not a universal number. Moreover, this ratio could become arbitrarily large at some values of the coupling constant. In addition, the value of the gap parameter is not a monotonic function of temperature, although the phase transition is a second order phase transition. In an extreme case, in fact, a nonzero finite temperature gap can appear even if its zero temperature value is vanishing.

AB - We present a detailed study of the recently proposed gapless color superconductivity in neutral two-flavor quark matter in β-equilibrium at zero as well as at finite temperature. We clarify the nature of the fermionic quasiparticles, and discuss the physical properties of this gapless phase of quark matter. The appearance of two "secondary" spin-1 condensates in the gapless ground state is pointed out. The gluon screening properties are also discussed. It is found that finite temperature properties of the gapless color superconductor are rather unusual. One of the most striking results is that the ratio of the critical temperature to the gap at zero temperature is not a universal number. Moreover, this ratio could become arbitrarily large at some values of the coupling constant. In addition, the value of the gap parameter is not a monotonic function of temperature, although the phase transition is a second order phase transition. In an extreme case, in fact, a nonzero finite temperature gap can appear even if its zero temperature value is vanishing.

KW - Anderson-Higgs mechanism

KW - Compact stars

KW - Dense quark matter

KW - Gapless color superconductor

KW - Meissner effect

UR - http://www.scopus.com/inward/record.url?scp=0345017178&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0345017178&partnerID=8YFLogxK

U2 - 10.1016/j.nuclphysa.2003.10.005

DO - 10.1016/j.nuclphysa.2003.10.005

M3 - Article

VL - 729

SP - 835

EP - 863

JO - Nuclear Physics A

JF - Nuclear Physics A

SN - 0375-9474

IS - 2-4

ER -