Siam Physics Congress 2022 (SPC2022)

Implications of the Interacting Quark EoS in the Quark Stars with 4D Einstein-Gauss-Bonnet gravity

S4 High Energy and Particle Physics

23 Jun 2022, 10:45

30m

QUARTZ

Board: INV-S4-1

Invited Speaker High Energy and Particle Physics S4 High Energy and Particle Physics

Speaker

Daris Samart

Description

The detection of gravitational waves (GWs) from the binary neutron star (BNS) has opened a new window on the gravitational wave astronomy. With current sensitivities, detectable signals coming from compact objects like neutron stars turn out to be a crucial ingredient for probing their structure, composition, and evolution. Moreover, the astronomical observations on the pulsars and their mass-radius relations put important constraints on the dense matter equation of state (EoS). In this talk, we will consider a homogeneous and unpaired charge-neutral 3-flavor interacting quark matter with (m${}^4$${}_{\text{s}}$) corrections that account for the moderately heavy strange quark instead of the naive MIT bag model. In addition, we study a strange quark star in the context of recently proposed 4D Einstein-Gauss-Bonnet (EGB) theory of gravity. However, this theory is not well defined in four-dimensional spacetime. Thus, we thoroughly show that the equivalence of the actions in the regularized 4D EGB theory and in the original one is satisfied for a spherically symmetric spacetime. We pay particular attention to the possible existence of massive neutron stars of mass compatible with M ~ 2M${}_{\text{⨀}}$. Our findings suggest that the fourth-order corrections parameter (a${}_{\text{4}}$) of the QCD perturbation and coupling constant α of the GB term play an important role in the mass-radius relation as well as the stability of the quark star. Finally, we compare the results with the well-measured limits of the pulsars and their mass and radius extracted from the spectra of several X-ray compact sources.