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Since the derivation of a well-defined $D\rightarrow 4$ limit for 4 dimensional Einstein Gauss-Bonnet (4DEGB) gravity coupled to a scalar field, there has been interest in testing it as an alternative to Einstein's general theory of…

General Relativity and Quantum Cosmology · Physics 2025-02-11 Michael Gammon , Robert B. Mann , Sarah Rourke

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…

General Relativity and Quantum Cosmology · Physics 2021-01-15 Ayan Banerjee , Takol Tangphati , Daris Samart , Phongpichit Channuie

In this study we obtain interior solutions and investigate structural properties of isotropic compact stars in the framework of four-dimensional regularized Einstein-Gauss-Bonnet (4DEGB) gravity. For stellar matter content, we adopt a…

General Relativity and Quantum Cosmology · Physics 2026-01-21 G. Panotopoulos , Á. Rincón , I. Lopes

The current trend concerning dense matter physics at sufficiently high densities and low temperatures is expected to behave as a degenerate Fermi gas of quarks forming Cooper pairs, namely a color superconductor, in the core of compact…

General Relativity and Quantum Cosmology · Physics 2021-09-15 Takol Tangphati , Anirudh Pradhan , Ayan Banerjee , Grigoris Panotopoulos

In the present paper we investigate the structure of relativistic stars in 4D Einstein-Gauss-Bonnet gravity. The mass-radius relations are obtained for realistic hadronic and for strange quark star equations of state, and for a wide range…

General Relativity and Quantum Cosmology · Physics 2021-05-19 Daniela D. Doneva , Stoytcho S. Yazadjiev

The existence of strange matter in compact stars may pose striking sequels of the various physical phenomena. As an alternative to neutron stars, a new class of compact stars called strange stars should exist if the strange matter…

General Relativity and Quantum Cosmology · Physics 2021-03-02 Ayan Banerjee , Takol Tangphati , Phongpichit Channuie

We investigate the properties of non-rotating, electrically charged strange quark stars in four-dimensional Einstein-Maxwell theory. For quark matter we adopt the well-motivated quantum chromodynamics (QCD) equation-of-state, while for the…

General Relativity and Quantum Cosmology · Physics 2022-05-04 Grigoris Panotopoulos , Takol Tangphati , Ayan Banerjee

Since the derivation of a well-defined $D\to4$ limit for 4D Einstein-Gauss-Bonnet (4DEGB) gravity coupled to a scalar field, there has been considerable interest in testing it as an alternative to Einstein's general theory of relativity.…

General Relativity and Quantum Cosmology · Physics 2025-04-25 Alejandro Saavedra , Octavio Fierro , Michael Gammon , Robert B. Mann , Guillermo Rubilar

Perturbative Quantum Chromodynamics corrections and the colour superconductivity indicate that strongly interacting matter can manifest unique physical behaviours under extreme conditions. Motivated by this notion, we investigate the…

General Relativity and Quantum Cosmology · Physics 2025-01-22 Debadri Bhattacharjee , Koushik Ballav Goswami , Pradip Kumar Chattopadhyay

In this work we study the properties of compact spheres made of a charged perfect fluid with a MIT bag model EoS for quark matter. Considering static spherically symmetric spacetime we derive the hydrostatic equilibrium equations in the…

General Relativity and Quantum Cosmology · Physics 2022-03-01 Juan M. Z. Pretel , Ayan Banerjee , Anirudh Pradhan

Hybrid star is the term given to a neutron star with a quark core. Due to a lot of uncertainties in the calculations and compositions of such a high-density system, it is of great interest and a preferred scenario for particle physicists…

General Relativity and Quantum Cosmology · Physics 2023-12-14 Akashdip Karmakar , Pramit Rej

We address the equilibrium configurations and stability properties of anisotropic compact stars whose interior is described by a modified Chaplygin gas (MCG) equation of state in the framework of the regularized four-dimensional…

General Relativity and Quantum Cosmology · Physics 2025-11-13 Anirudh Pradhan , Takol Tangphati , Ayan Banerjee , Javlon Rayimbaev

We investigate the properties of dense quark matter and strange quark stars within a nonperturbative, Poincar\'e-covariant framework. Employing a symmetry-preserving vector$\,\otimes\,$vector contact interaction model, we extend the quark…

Nuclear Theory · Physics 2026-04-23 Hao-Ran Zhang , Bo-Lin Li , Zhu-Fang Cui

We study non-rotating and isotropic strange quark stars in Lorentz-violating theories of gravity, and in particular in Ho\v{r}ava gravity and Einstein-{\ae}ther theory. For quark matter we adopt both linear and non-linear equations of…

General Relativity and Quantum Cosmology · Physics 2020-06-22 Grigoris Panotopoulos , Daniele Vernieri , Ilídio Lopes

White dwarfs (WDs), as the remnants of low to intermediate-mass stars, provide a unique opportunity to explore the interplay between quantum mechanical degeneracy pressure and gravitational forces under extreme conditions. In this study, we…

General Relativity and Quantum Cosmology · Physics 2025-05-22 Juan M. Z. Pretel , Takol Tangphati , İzzet Sakallı , Ayan Banerjee

The article explores the first exact solution in a four-dimensional EGB-gravity with an anisotropic matter source. The solution has been found by two assumptions, a metric potential and the MIT-bag equation of state. Further, the solution…

General Relativity and Quantum Cosmology · Physics 2021-10-08 Ksh. Newton Singh , S. K. Maurya , Abhisek Dutta , Farook Rahaman , Somi Aktar

It is still a matter of debate to understand the equation of state of cold supra-nuclear matter in compact stars because of unknown on-perturbative strong interaction between quarks. Nevertheless, it is speculated from an astrophysical view…

Solar and Stellar Astrophysics · Physics 2015-05-20 X. S. Na , R. X. Xu

We investigate interacting quark matter (IQM), including the perturbative QCD correction and color superconductivity, for both up-down quark matter ($ud$QM) and strange quark matter (SQM). We first derive an equation of state (EOS) unifying…

High Energy Astrophysical Phenomena · Physics 2021-09-20 Chen Zhang , Robert B. Mann

This study explores the properties of quark stars (QS) formulated with an interacting quark matter equation of state (EoS) within the framework of Rastall gravity, a modified theory of gravity. We derive the mass-radius relationships and…

General Relativity and Quantum Cosmology · Physics 2024-12-13 Ayan Banerjee , Anirudh Pradhan , Izzet Sakalli , Archana Dixit

We investigate the impact of hyperons and phase transition to quark matter on the structural properties of neutron stars within the regularized four-dimensional Einstein-Gauss-Bonnet gravity (4DEGB). We employ the density-dependent…

Nuclear Theory · Physics 2025-11-04 Ishfaq Ahmad Rather , Grigoris Panotopoulos
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