Quark mass effects on the stability of hybrid stars

M. Buballa, F. Neumann, M. Oertel, Igor Shovkovy

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

We perform a study of the possible existence of hybrid stars with color superconducting quark cores using a specific hadronic model in a combination with an NJL-type quark model. It is shown that the constituent mass of the non-strange quarks in vacuum is a very important parameter that controls the beginning of the hadron-quark phase transition. At relatively small values of the mass, the first quark phase that appears is the two-flavor color superconducting (2SC) phase which, at larger densities, is replaced by the color-flavor locked (CFL) phase. At large values of the mass, on the other hand, the phase transition goes from the hadronic phase directly into the CFL phase avoiding the 2SC phase. It appears, however, that the only stable hybrid stars obtained are those with the 2SC quark cores.

Original languageEnglish (US)
Pages (from-to)36-43
Number of pages8
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume595
Issue number1-4
DOIs
StatePublished - Aug 12 2004
Externally publishedYes

Fingerprint

quarks
stars
color
quark models
vacuum

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Quark mass effects on the stability of hybrid stars. / Buballa, M.; Neumann, F.; Oertel, M.; Shovkovy, Igor.

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 595, No. 1-4, 12.08.2004, p. 36-43.

Research output: Contribution to journalArticle

@article{5bd49caf22d8420ab7782a86372d37a7,
title = "Quark mass effects on the stability of hybrid stars",
abstract = "We perform a study of the possible existence of hybrid stars with color superconducting quark cores using a specific hadronic model in a combination with an NJL-type quark model. It is shown that the constituent mass of the non-strange quarks in vacuum is a very important parameter that controls the beginning of the hadron-quark phase transition. At relatively small values of the mass, the first quark phase that appears is the two-flavor color superconducting (2SC) phase which, at larger densities, is replaced by the color-flavor locked (CFL) phase. At large values of the mass, on the other hand, the phase transition goes from the hadronic phase directly into the CFL phase avoiding the 2SC phase. It appears, however, that the only stable hybrid stars obtained are those with the 2SC quark cores.",
author = "M. Buballa and F. Neumann and M. Oertel and Igor Shovkovy",
year = "2004",
month = "8",
day = "12",
doi = "10.1016/j.physletb.2004.05.064",
language = "English (US)",
volume = "595",
pages = "36--43",
journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",
issn = "0370-2693",
publisher = "Elsevier",
number = "1-4",

}

TY - JOUR

T1 - Quark mass effects on the stability of hybrid stars

AU - Buballa, M.

AU - Neumann, F.

AU - Oertel, M.

AU - Shovkovy, Igor

PY - 2004/8/12

Y1 - 2004/8/12

N2 - We perform a study of the possible existence of hybrid stars with color superconducting quark cores using a specific hadronic model in a combination with an NJL-type quark model. It is shown that the constituent mass of the non-strange quarks in vacuum is a very important parameter that controls the beginning of the hadron-quark phase transition. At relatively small values of the mass, the first quark phase that appears is the two-flavor color superconducting (2SC) phase which, at larger densities, is replaced by the color-flavor locked (CFL) phase. At large values of the mass, on the other hand, the phase transition goes from the hadronic phase directly into the CFL phase avoiding the 2SC phase. It appears, however, that the only stable hybrid stars obtained are those with the 2SC quark cores.

AB - We perform a study of the possible existence of hybrid stars with color superconducting quark cores using a specific hadronic model in a combination with an NJL-type quark model. It is shown that the constituent mass of the non-strange quarks in vacuum is a very important parameter that controls the beginning of the hadron-quark phase transition. At relatively small values of the mass, the first quark phase that appears is the two-flavor color superconducting (2SC) phase which, at larger densities, is replaced by the color-flavor locked (CFL) phase. At large values of the mass, on the other hand, the phase transition goes from the hadronic phase directly into the CFL phase avoiding the 2SC phase. It appears, however, that the only stable hybrid stars obtained are those with the 2SC quark cores.

UR - http://www.scopus.com/inward/record.url?scp=3843112114&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=3843112114&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2004.05.064

DO - 10.1016/j.physletb.2004.05.064

M3 - Article

VL - 595

SP - 36

EP - 43

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

SN - 0370-2693

IS - 1-4

ER -