Utilize este identificador para referenciar este registo: https://hdl.handle.net/10316/95848
Título: Hybrid stars with large strange quark cores constrained by GW170817
Autor: Ferreira, Márcio
Pereira, Renan Câmara
Providência, Constança 
Palavras-chave: Nuclear Theory; High Energy Physics; Phenomenology
Data: 13-Mai-2021
Editora: American Physical Society
Projeto: PD/BD/128234/2016 
POCI-01-0145-FEDER-029912 
UID/04564/2020 
UID/FIS/04564/2019 
Título da revista, periódico, livro ou evento: Physical Review D
Volume: 103
Número: 12
Resumo: We analyze the impact of several multi-quark interaction channels on the properties of hybrid stars. Four and eight vector interactions were included in the $SU(3)$ NJL model to describe the quark matter, and all vector like interactions were investigated. The hybrid stars were built starting from an hadronic EoS that satisfy presently accepted nuclear matter properties and considering the quark model constrained by the vacuum properties of several light mesons. The interplay between the 8-quark vector interaction and the 4-quark isovector-vector interaction determine the size of the quark core and its strangeness content. The inclusion of a isovector-vector interaction is essential to obtain large $s$-quark contents and a smaller central speed of sound, although this interaction pushes the onset of quarks to larger densities. It is observed that low mass stars, with a mass below 1.4$M_\odot$, may contain a quark core but with small strangeness content. It is shown that the presently existing mass and tidal deformability constraints from NS observations allow for the existence of hybrid stars with a large strangeness content and large quark cores for binary mass ratios $q=M_2/M_1\gtrsim 0.85$.
Descrição: 12 pages, 8 figures; matches the published version
URI: https://hdl.handle.net/10316/95848
ISSN: 2470-0010
2470-0029
DOI: 10.1103/PhysRevD.103.123020
Direitos: openAccess
Aparece nas coleções:I&D CFis - Artigos em Revistas Internacionais

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