Asymmetric Dark Matter Capture Leaves Neutron Star Structure and Tidal Deformability Largely Unchanged
Capture-driven asymmetric dark matter accumulation in neutron stars induces only minor compactness increases and tidal-deformability suppression, remaining undetectable in gravitational-wave observations except under contrived extreme conditions over cosmic timescales. The work supplies conservative upper bounds rather than positive signals.
The arXiv preprint develops a time-dependent capture formalism coupled to a three-layer polytropic equation of state and integrates the two-fluid Tolman-Oppenheimer-Volkoff equations over Hubble time. Across a broad parameter scan that deliberately maximizes capture efficiency, the dark-matter mass fraction stays below a few percent except in the densest environments, producing fractional changes in radius and Love number at the percent level or less. For realistic Galactic or cluster densities the structural shifts fall well below current and planned LIGO-Virgo-KAGRA and Einstein Telescope sensitivities.
Liu et al.: No neutron-star merger event observed by LIGO O5 or Einstein Telescope in the first five years will show tidal-deformability deviations exceeding 3 percent attributable to captured asymmetric dark matter.
Sources (3)
- [1]Primary Source(https://arxiv.org/abs/2608.07729)
- [2]Supporting Source(https://arxiv.org/abs/2305.13399)
- [3]Supporting Source(https://journals.aps.org/prd/abstract/10.1103/PhysRevD.107.103028)