Physical characteristics and maximum allowable mass of hybrid star in the context of f(Q) gravity

• Published in: The European physical journal. C, Particles and fields Vol. 83; no. 7; pp. 646 - 19
• Main Authors: Bhar, Piyali, Pradhan, Sneha, Malik, Adnan, Sahoo, P. K.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-07-2023; Springer; Springer Nature B.V; SpringerOpen
• Subjects: Analysis; Anisotropy; Astronomy; Astrophysics and Cosmology; Baryons; Density; Elementary Particles; Equations of state; Gravity; Hadrons; Heavy Ions; Linear equations; Mathematical models; Measurement Science and Instrumentation; Nuclear Energy; Nuclear Physics; Parameters; Physical properties; Physics; Physics and Astronomy; Quadratic forms; Quantum Field Theories; Quantum Field Theory; Quarks; Regular Article - Theoretical Physics; Stellar models; String Theory
• ISSN: 1434-6052; 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-023-11745-y

In this study, we explore several new characteristics of a static anisotropic hybrid star with strange quark matter (SQM) and ordinary baryonic matter (OBM) distribution. Here, we use the MIT bag model equation of state to connect the density and pressure of SQM inside stars, whereas the linear equation of state
p
r
=
α
ρ
-
β
connects the radial pressure and matter density caused by baryonic matter. The stellar model was developed under a background of
f
(
Q
) gravity using the quadratic form of
f
(
Q
). We utilized the Tolman–Kuchowicz ansatz (Tolman in Phys. Rev. 55:364–373, 1939; Kuchowicz in Acta Phys Pol 33: 541, 1968) to find the solutions to the field equations under modified gravity. We have matched the interior solution to the external Schwarzschild spacetime in order to acquire the numerical values of the model parameters. We have selected the star Her X-1 to develop various profiles of the model parameters. Several significant physical characteristics have been examined analytically and graphically, including matter densities, tangential and radial pressures, energy conditions, anisotropy factor, redshirt, compactness, etc. The main finding is that there is no core singularity present in the formations of the star under investigation. The nature of mass and the bag constant
B
g
have been studied in details through equi-mass and equi-
B
g
contour. The maximum allowable mass and the corresponding radius have been obtained via
M
-
R
plots.