Neutrino and Gamma-Ray Signatures of Inelastic Dark Matter Annihilating outside Neutron Stars
arxiv(2024)
摘要
We present a new inelastic dark matter search: neutron stars in dark
matter-rich environments capture inelastic dark matter which, for interstate
mass splittings between about 45 - 285 MeV, will annihilate away before
becoming fully trapped inside the object. This means a sizable fraction of the
dark matter particles can annihilate while being outside the neutron star,
producing neutron star-focused gamma-rays and neutrinos. We analyze this effect
for the first time and target the neutron star population in the Galactic
Center, where the large dark matter and neutron star content makes this signal
most significant. Depending on the assumed neutron star and dark matter
distributions, we set constraints on the dark matter-nucleon inelastic
cross-section using existing H.E.S.S. observations. We also forecast the
sensitivity of upcoming gamma-ray and neutrino telescopes to this signal, which
can reach inelastic cross-sections as low as ∼ 2 × 10^-47
cm^2.
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