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We revisit constraints on small-scale primordial power from annihilationsignals from dark matter minihalos. Using gamma rays and neutrinos fromextragalactic minihalos and assuming the delta-function primordial spectrum, weshow the dependence of the constraints on annihilation modes, the mass of darkmatter, and the annihilation cross section. We report both conservativeconstraints by assuming minihalos are fully destructed when becoming part ofhalos originating from the standard almost-scale invariant primordial spectrum,and optimistic constraints by neglecting destruction.

Constraints on small-scale primordial power by annihilation signals from extragalactic dark matter minihalos