Color-flavor locked quark stars in energy-momentum squared gravity

Abstract

Several attempts have been made in the past decades to search for the true ground state of the dense matter at sufficiently large densities and low temperatures via compact astrophysical objects. Focusing on strange stars, we derive the hydrostatic equilibrium assuming a maximally symmetric phase of homogeneous superconducting quark matter called the \textit{color-flavor-locked} (CFL) phase in the background of energy-momentum squared gravity (EMSG). Theoretical and experimental investigations show that strange quark matter (SQM) in a CFL state can be the true ground state of hadronic matter at least for asymptotic densities, and even if the unequal quark masses. Motivated by these theoretical models, we explore the structure of stellar objects in recently proposed EMSG, which allows a correction term $T_{\mu \nu }{T}^{\mu \nu }$ in the action functional of the theory. Interestingly, EMSG may be effective to resolve the problems at high energy densities, e.g., relevant to the early universe and dense compact astrophysical objects without invoking some new forms of fluid stress, such as bulk viscosity or scalar fields. Finally, we solve the complicated field equations numerically to obtain the mass-radius relations for strange stars in CFL equation of state.

7 pages, 7 figures; accepted for publication in Phys.Dark Univ

References in corpus (7)

• Shapiro delay measurement of a two solar mass neutron star
• A Massive Pulsar in a Compact Relativistic Binary
• Color superconductivity in dense quark matter
• Neutron-star radius constraints from GW170817 and future detections
• Energy-Momentum Squared Gravity
• Non-exotic matter wormholes in a trace of the energy-momentum tensor squared gravity
• Low redshift constraints on energy-momentum-powered gravity models

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• Gravitationally induced matter creation in scalar-tensor $f(R,T_{\mu \nu }{T}^{\mu \nu })$ gravity
• Cosmological models in scale-independent energy-momentum squared gravity
• Noether Symmetries and Anisotropic Universe in Energy-Momentum Squared Gravity
• Energy-Momentum Squared Gravity: A Brief Overview
• Relativistic structure of charged quark stars in energy-momentum squared gravity
• Axion stars in MGD background
• Shadow behavior of an EMSG charged black hole
• Weak field and slow motion limits in energy-momentum powered gravity
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• When gravitational decoupling and quantum gravity (re)unite
• Modification of the universal relation between mass, radius and nonradial $f$-mode oscillation in proto-neutron stars
• Cosmological perturbations in the energy-momentum squared gravity theory: constraints from gravitational wave standard sirens and redshift space distortions
• Statistical complexity as a probe of mass and phase structure in compact objects