Constraints on ultracompact minihalos from the extragalactic gamma-ray background observation

Abstract

Ultracompact minihalo (UCMH) is a special type of dark matter halo with a very steep density profile which may form in the early universe seeded by an overdense region or a primordial black hole. Constraints on its abundance give valuable information on the power spectrum of primordial perturbation. In this work, we update the constraints on the UCMH abundance in the universe using the extragalactic gamma-ray background (EGB) observation. Comparing to previous works, we adopt the updated Fermi-LAT EGB measurement and derive constraints based on a full consideration of the astrophysical contributions. With these improvements, we place constraints on UCMH abundance 1-2 orders of magnitude better than previous results. With the background components considered, we can also attempt to search for possible additional components beyond the known astrophysical contributions.

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Cited by in corpus (5)

• Minihalos as probes of the inflationary spectrum: accurate boost factor calculation and new CMB constraints
• Impact of radiation from primordial black holes on the 21-cm angular-power spectrum in the dark ages
• Updated constraints on the primordial power spectrum at sub-Mpc scales
• Cosmological abundance of primordial black holes in mixed dark matter scenarios incorporating Kaluza-Klein dark matter
• KiDS-Legacy: WIMP dark matter constraints from the cross-correlation of weak lensing and Fermi-LAT gamma rays