Phase diagram of neutral quark matter in nonlocal chiral quark models
We consider the phase diagram of two-flavor quark matter under neutron star constraints for two nonlocal, covariant quark models within the mean-field approximation. In the first case (Model I) the nonlocality arises from the regularization procedure, motivated by the instanton liquid model, whereas...
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| Autores principales: | , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
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2006
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/126040 |
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I19-R120-10915-126040 |
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dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ciencias Exactas Física phase diagram Physics quark matter neutral quark matter |
| spellingShingle |
Ciencias Exactas Física phase diagram Physics quark matter neutral quark matter Gómez Dumm, Daniel Alberto Blaschke, David Grunfeld, Ana Gabriela Scoccola, Norberto Nerio Phase diagram of neutral quark matter in nonlocal chiral quark models |
| topic_facet |
Ciencias Exactas Física phase diagram Physics quark matter neutral quark matter |
| description |
We consider the phase diagram of two-flavor quark matter under neutron star constraints for two nonlocal, covariant quark models within the mean-field approximation. In the first case (Model I) the nonlocality arises from the regularization procedure, motivated by the instanton liquid model, whereas in the second one (Model II) a separable approximation of the one-gluon exchange interaction is applied. We find that Model II predicts a larger quark mass gap and a chiral symmetry breaking (CSB) phase transition line which extends 15–20% further into the phase diagram spanned by temperature (T) and chemical potential (μ). The corresponding critical temperature at μ = 0,T<sub>c</sub>(0) ≃ 140 MeV, is in better accordance to recent lattice QCD results than the prediction of the standard local NJL model, which exceeds 200 MeV. For both Model I and Model II we have considered various coupling strengths in the scalar diquark channel, showing that different low-temperature quark matter phases can occur at intermediate densities: a normal quark matter (NQM) phase, a two-flavor superconducting (2SC) quark matter phase and a mixed 2SC-NQM phase. Although in most cases there is also a gapless 2SC phase, this occurs in general in a small region at nonzero temperatures, thus its effect should be negligible for compact star applications. |
| format |
Articulo Articulo |
| author |
Gómez Dumm, Daniel Alberto Blaschke, David Grunfeld, Ana Gabriela Scoccola, Norberto Nerio |
| author_facet |
Gómez Dumm, Daniel Alberto Blaschke, David Grunfeld, Ana Gabriela Scoccola, Norberto Nerio |
| author_sort |
Gómez Dumm, Daniel Alberto |
| title |
Phase diagram of neutral quark matter in nonlocal chiral quark models |
| title_short |
Phase diagram of neutral quark matter in nonlocal chiral quark models |
| title_full |
Phase diagram of neutral quark matter in nonlocal chiral quark models |
| title_fullStr |
Phase diagram of neutral quark matter in nonlocal chiral quark models |
| title_full_unstemmed |
Phase diagram of neutral quark matter in nonlocal chiral quark models |
| title_sort |
phase diagram of neutral quark matter in nonlocal chiral quark models |
| publishDate |
2006 |
| url |
http://sedici.unlp.edu.ar/handle/10915/126040 |
| work_keys_str_mv |
AT gomezdummdanielalberto phasediagramofneutralquarkmatterinnonlocalchiralquarkmodels AT blaschkedavid phasediagramofneutralquarkmatterinnonlocalchiralquarkmodels AT grunfeldanagabriela phasediagramofneutralquarkmatterinnonlocalchiralquarkmodels AT scoccolanorbertonerio phasediagramofneutralquarkmatterinnonlocalchiralquarkmodels |
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Repositorios |
| _version_ |
1764820450039300096 |