Work

Effects of dark boson mediated feeble interaction between dark matter (DM) and quark matter on f-mode oscillation of DM admixed quark stars

Year: 2025

Type: article

Abstract: We investigate the behavior of the prominent non-radial fundamental f -mode oscillations of dark matter (DM) admixed strange quark stars (DMSQSs), by adopting an equation of state (EoS) developed in Ref. Sen and Guha (Mon Not R Astron Soc 517:518, 2022. https://doi.org/10.1093/mnras/stac2675 ), which considers the possible presence of feebly interacting DM in strange quark stars (SQSs) for the first time. Within the model, feeble interaction between fermionic DM $$\chi $$ χ and strange quark matter (SQM) is invoked via a vector new physics mediator $$\xi $$ ξ with coupling strength $$y_{\xi }$$ y ξ . The pure SQM is described by the vector MIT Bag model. By varying different EoS parameters, the structural properties viz. the mass, radius and tidal deformability ( $$\Lambda $$ Λ ) of the DMSQSs are studied with respect to various astrophysical constraints. We study in detail the f -mode spectra within the Cowling approximation by obtaining the frequencies as a function of mass, compactness and $$\Lambda $$ Λ of the star. To the best of our knowledge, this study represents the first analysis of non-radial f -mode oscillations of DMSQSs. Our investigation indicates that the presence of DM and its interaction with SQM has great impact on the f -modes. We show that the f -mode frequencies are larger for DMSQSs, which are largely populated with massive DM fermions, compared to the SQSs. Further, we obtain a linear empirical relation between the f -modes and the average density of the star. We also find that the mass-scaled angular frequency varies universally with compactness and $$\ln {\Lambda }$$ ln Λ for DMSQSs. Further, our studies indicate that the inclusion of DM in compact stars reduces the deviation of f -mode frequency from general relativistic to Cowling approximation.

Source: The European Physical Journal C

DOI: 10.1140/epjc/s10052-025-14109-w

Authors: O. P. Jyothilakshmi, Lakshmi J. Naik, Debashree Sen, Atanu Guha, V. Sreekanth

Institutions: Amrita Vishwa Vidyapeetham, Korea University, Chungnam National University

Language: English

Topic: Pulsars and Gravitational Waves Research

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: diamond

Funders: National Research Foundation, National Research Foundation of Korea, Ministry of Science and ICT, South Korea

Awards: G1883778784, G3439883687, G4143380926