Multiscatter capture of superheavy dark matter by Pop. III stars
Aug 26, 201923 pages
Published in:
- JCAP 12 (2019) 051,
- JCAP 10 (2020) E01 (erratum)
- Published: Dec 17, 2019
e-Print:
- 1908.02700 [astro-ph.CO]
DOI:
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Abstract: (IOP)
If captured by the gravitational field of stars or other compact objects, dark matter can self-annihilate and produce a potentially detectable particle flux. In the case of superheavy dark matter ( mX ≳ 108 GeV), a large number of scattering events with nuclei inside stars are necessary to slow down the dark matter particles below the escape velocity of the stars, at which point the Dark Matter (DM) particle becomes trapped, or captured. Using the recently developed analytical formalism for multiscatter capture, combined with the latest results on the constraints of dark-matter-baryon scattering cross-section, we calculate upper bounds on the capture rates for superheavy dark matter particles by the first (Pop. III) stars. Assuming that a non-zero fraction of the products of captured superheavy dark matter (SHDM) annihilations can be trapped and thermalized inside the star, we find that this additional heat source could influence the evolutionary phase of Pop. III stars. Moreover, requiring that Pop. III stars shine with sub-Eddington luminosity, we find upper bounds on the masses of the Pop. III stars. This implies a DM dependent cutoff on the initial mass function (IMF) of Pop. III stars, thus opening up the intriguing possibility of constraining DM properties using the IMF of extremely metal-poor stars.Note:
- Added an appendix with details regarding the SHDM annihilations
- star: velocity
- dark matter: scattering
- capture
- dark matter: annihilation
- dark matter: mass
- gravitation
- nucleus
- flux
References(53)
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