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Compact stars consisting of massless quark matter and fermionic dark matter are studied by solving the Tolman-Oppenheimer-Volkoff equations for two fluids separately. Dark matter is further investigated by incorporating inter-fermionic…

High Energy Astrophysical Phenomena · Physics 2016-04-27 Payel Mukhopadhyay , Juregen Schaffner-Bielich

We study the effects of dark matter on the structural properties of neutron stars. In particular we investigate how the presence of a dark matter component influences the mass-radius relation, the value of the maximum mass of a neutron star…

High Energy Astrophysical Phenomena · Physics 2025-05-29 Domenico Scordino , Ignazio Bombaci

We study an impact of asymmetric fermionic dark matter on neutron star properties, including tidal deformability, mass, radius, etc. We present the conditions at which dark matter particles tend to form a compact structure in a core of the…

High Energy Astrophysical Phenomena · Physics 2021-11-29 V. Sagun , E. Giangrandi , O. Ivanytskyi , I. Lopes , K. A. Bugaev

We study the structure of compact objects that contain non-self annihilating, self-interacting dark matter admixed with ordinary matter made of neutron star and white dwarf materials. We extend the previous work Phys. Rev. D 92 123002…

General Relativity and Quantum Cosmology · Physics 2019-05-15 Maksym Deliyergiyev , Antonino Del Popolo , Laura Tolos , Morgan Le Delliou , Xiguo Lee , Fiorella Burgio

In this work we investigate the properties of neutron stars admixed with selfinteracting scalar bosonic dark matter. The dark matter interaction is described by a generalized $\phi^n$ power-law potential. We perform a stability analysis of…

High Energy Astrophysical Phenomena · Physics 2024-12-11 Sarah Louisa Pitz , Jürgen Schaffner-Bielich

We investigate the impact of dark matter on neutron star properties using the relativistic mean-field theory. By incorporating the dark matter model, we explore how dark matter parameters, specifically dark matter mass and Fermi momentum,…

High Energy Astrophysical Phenomena · Physics 2024-08-29 Ankit Kumar , Hajime Sotani

We study the hydrostatic equilibrium configuration of an admixture of degenerate dark matter and normal nuclear matter by using a general relativistic two-fluid formalism. We consider non- self-annihilating dark matter particles of mass ~ 1…

Cosmology and Nongalactic Astrophysics · Physics 2011-11-09 S. -C. Leung , M. -C. Chu , L. -M. Lin

The tidal deformability and the radius of neutron stars are observables, which have been used to constrain the neutron star equation of state and explore the composition in neutron stars. We investigated the radius and tidal deformability…

High Energy Astrophysical Phenomena · Physics 2024-09-06 Hongyi Sun , Dehua Wen

Neutron stars could contain a mixture of ordinary nuclear matter and dark matter, such that dark matter could influence observable properties of the star, such as its mass and radius. We study these dark matter admixed neutron stars for two…

General Relativity and Quantum Cosmology · Physics 2021-11-09 Ben Kain

We investigate compact objects formed by dark matter admixed with ordinary matter made of neutron star matter and white dwarf material. We consider non-self annihilating dark matter with an equation-of-state given by an interacting Fermi…

High Energy Astrophysical Phenomena · Physics 2022-02-21 Laura Tolos , Juergen Schaffner-Bielich , Yannick Dengler

We investigate neutron star-black hole (NS-BH) merger candidates as a test for compact exotic objects. Using the events GW190814, GW200105 and GW200115 measured by the LIGO-Virgo collabration, which represent a broad profile of the masses…

High Energy Astrophysical Phenomena · Physics 2023-12-14 Stephan Wystub , Yannick Dengler , Jan-Erik Christian , Jürgen Schaffner-Bielich

We investigate the structural and observable impacts of dark matter (DM) on neutron stars using a combined equation of state that integrates the relativistic mean field (RMF) model for baryonic matter with a variable density profile for DM,…

High Energy Astrophysical Phenomena · Physics 2025-01-14 Ankit Kumar , Hajime Sotani

We consider a thermodynamically consistent approach for the computation of the masses, radii, and tidal deformabilities of compact stars consisting of two interacting fluids with separately conserved quantum numbers. We apply this…

High Energy Physics - Phenomenology · Physics 2026-02-25 Fazlollah Hajkarim , Jürgen Schaffner-Bielich , Laura Tolos

We investigate the structure of admixed neutron stars with a regular hadronic component and a fraction of fermionic self-interacting dark matter. Using two limiting equations of state for the dense baryonic interior, constructed from…

We investigate the influence of ideal Fermi gas dark matter on the observable properties of neutron stars (NSs). Our analysis considers dark matter (DM) particle masses ($\mu$) ranging from $0.2$ GeV to $1$ GeV and various DM mass fractions…

General Relativity and Quantum Cosmology · Physics 2026-03-24 Monmoy Molla , Masum Murshid , Mehedi Kalam

Compact stars consisting of fermions with arbitrary masses and interaction strengths are studied by solving the structure equation of general relativity, the Tolman-Oppenheimer-Volkoff equations. Scaling solutions are derived for a free and…

Astrophysics · Physics 2008-11-26 Gaurav Narain , Jurgen Schaffner-Bielich , Igor N. Mishustin

The masses and radii of non-rotating and rotating configurations of pure hadronic stars mixed with self-interacting fermionic Asymmetric Dark Matter are calculated within the two-fluid formalism of stellar structure equations in general…

Nuclear Theory · Physics 2017-07-06 Somnath Mukhopadhyay , Debasis Atta , Kouser Imam , D. N. Basu , C. Samanta

The neutron star properties are generally determined by the equation of state of $\beta$-equilibrated dense matter. In this work, we consider the interaction of fermionic dark matter (DM) particles with the nucleons via Higgs exchange and…

High Energy Astrophysical Phenomena · Physics 2022-01-19 H. C. Das , Ankit Kumar , Bharat Kumar , S. K. Patra

By assuming that only gravitation acts between dark matter (DM) and normal matter (NM), we studied DM admixed neutron stars (DANSs) using the two-fluid TOV equations. The NM and DM of compact stars are simulated by the relativistic mean…

Cosmology and Nongalactic Astrophysics · Physics 2019-09-25 X. D. Wang , B. Qi , N. B. Zhang , S. Y. Wang

We investigate how simultaneous mass and radius measurements of massive neutron stars (NSs) can help constrain properties of dark matter (DM) possibly admixed in them. Within a fermionic DM model that interacts only through gravitation,…

High Energy Astrophysical Phenomena · Physics 2025-10-07 Nai-Bo Zhang , Bao-An Li , Jia-Yu Zhang , Wei-Na Shen , Hui Zhang
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