$g$-mode oscillations of dark matter admixed neutron stars
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866914177785790464 |
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| author | Shirke, Swarnim Chatterjee, Debarati Jaikumar, Prashanth |
| author_facet | Shirke, Swarnim Chatterjee, Debarati Jaikumar, Prashanth |
| contents | We investigate $g$-mode oscillations in dark matter admixed neutron stars employing a relativistic mean field model to describe hadronic matter and a model for self-interacting fermionic dark matter motivated by the neutron decay anomaly. Following the construction of such admixed configurations, we derive the equilibrium and adiabatic speeds of sound therein, leading to a computation of the star's $g$-mode spectrum in the Cowling approximation. In particular, we explore the effect of dark matter self-interaction, the nucleon effective mass and dark matter fraction on the principal $g$-mode frequency, and its first overtone. We show that the effect on $g$-mode frequency depends predominantly on the dark matter fraction, and demonstrate an equation of state-independent constraint for the latter. Prospects of identifying the presence of dark matter in neutron stars using $g$-mode are discussed. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_18892 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | $g$-mode oscillations of dark matter admixed neutron stars Shirke, Swarnim Chatterjee, Debarati Jaikumar, Prashanth General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena Solar and Stellar Astrophysics Nuclear Theory We investigate $g$-mode oscillations in dark matter admixed neutron stars employing a relativistic mean field model to describe hadronic matter and a model for self-interacting fermionic dark matter motivated by the neutron decay anomaly. Following the construction of such admixed configurations, we derive the equilibrium and adiabatic speeds of sound therein, leading to a computation of the star's $g$-mode spectrum in the Cowling approximation. In particular, we explore the effect of dark matter self-interaction, the nucleon effective mass and dark matter fraction on the principal $g$-mode frequency, and its first overtone. We show that the effect on $g$-mode frequency depends predominantly on the dark matter fraction, and demonstrate an equation of state-independent constraint for the latter. Prospects of identifying the presence of dark matter in neutron stars using $g$-mode are discussed. |
| title | $g$-mode oscillations of dark matter admixed neutron stars |
| topic | General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena Solar and Stellar Astrophysics Nuclear Theory |
| url | https://arxiv.org/abs/2506.18892 |