Year: 2025
Type: article
Abstract: We employ the renormalization group optimized perturbation theory (RGOPT) resummation method to evaluate the equation of state (EoS) for strange ( N f = 2 + 1 ) and nonstrange ( N f = 2 ) cold quark matter at next-to-leading order. This allows us to obtain the mass-radius relation for pure quark stars and compare the results with the predictions from perturbative QCD (pQCD) at next-to-next-to-leading order. Choosing the renormalization scale to generate maximum star masses of order M = 2 − 2.6 M ⊙ , we show that the RGOPT can produce mass-radius curves compatible with the masses and radii of some recently observed pulsars, regardless of their strangeness content. The scale values required to produce the desired maximum masses are higher in the strange scenario since the EoS is softer in this case. The possible reasons for such behavior are discussed. Our results also show that, as expected, the RGOPT predictions for the relevant observables are less sensitive to scale variations than those furnished by pQCD.
DOI: 10.1103/7x41-j7mv
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Funders: Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro, Instituto Nacional de Ciência e Tecnologia: Física Nuclear e Aplicações, Fundação para a Ciência e a Tecnologia
Awards: G1044127334, Matéria em condições extremas: estrelas de neutrões na era multi-mensageiro, G1759509370, G214826906, G229093490, G2530734026, G29316538, Centro de Física da Universidade de Coimbra, G3588731312, G3892534497, G3978731422, G429285467, G4903323466, G5232016159, G5822632109, G584384340, G6489768745, G6997658380, Centro de Física da Universidade de Coimbra, G7418193128, G797411214, G9000291925
OpenAlex ID: W4406879740