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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2509.03272 |
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| _version_ | 1866916931002433536 |
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| author | Takátsy, János Zwick, Lorenz O'Neill, David Samsing, Johan |
| author_facet | Takátsy, János Zwick, Lorenz O'Neill, David Samsing, Johan |
| contents | The accretion of dark matter (DM) onto compact objects and the potential gravitational collapse of neutron stars due to this accretion has become a promising indirect probe of DM properties, complementing terrestrial experiments. We show that the accretion flux of DM on stellar objects is amplified in binary systems due to the complex gravitational interaction of said particles with the binary. We perform few-body Monte Carlo simulations to show that this amplification factor is $\sim4-5$ for circular binaries, small DM velocity dispersions and mass ratios $q\gtrsim0.3$. We use this factor to improve previous constraints on the scattering cross section of non-annihilating bosonic DM with baryonic matter, and derive upper bounds on this cross section from the observation of the binary NS merger associated with GW170817. We also show that the maximally accretable mass fraction of DM by binary NSs is $\lesssim10^{-3}$, even for extreme DM densities only possible in DM spikes, due to the dynamical friction exerted by the ambient DM. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_03272 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Amplified capture rate of dark matter in compact binaries and constraints on bosonic dark matter from GW170817 Takátsy, János Zwick, Lorenz O'Neill, David Samsing, Johan High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology High Energy Physics - Phenomenology The accretion of dark matter (DM) onto compact objects and the potential gravitational collapse of neutron stars due to this accretion has become a promising indirect probe of DM properties, complementing terrestrial experiments. We show that the accretion flux of DM on stellar objects is amplified in binary systems due to the complex gravitational interaction of said particles with the binary. We perform few-body Monte Carlo simulations to show that this amplification factor is $\sim4-5$ for circular binaries, small DM velocity dispersions and mass ratios $q\gtrsim0.3$. We use this factor to improve previous constraints on the scattering cross section of non-annihilating bosonic DM with baryonic matter, and derive upper bounds on this cross section from the observation of the binary NS merger associated with GW170817. We also show that the maximally accretable mass fraction of DM by binary NSs is $\lesssim10^{-3}$, even for extreme DM densities only possible in DM spikes, due to the dynamical friction exerted by the ambient DM. |
| title | Amplified capture rate of dark matter in compact binaries and constraints on bosonic dark matter from GW170817 |
| topic | High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2509.03272 |