Neutrino and Positron Constraints on Spinning Primordial Black Hole Dark Matter

Abstract

Angular momentum is a fundamental property of a black hole and is known to have a strong effect on its evaporation rate. It has recently been postulated that primordial black holes can have substantial spin. We conduct a comprehensive study of the detectability of primordial black holes with non-negligible spin, via the searches for the diffuse supernova neutrino background and observation of the 511 keV gamma-ray line from positrons in the Galactic center, setting competitive constraints. Spinning primordial black holes are probed up to a slightly higher mass range compared to non-spinning ones. Our constraint using neutrinos is slightly weaker than that due to the diffuse gamma-ray background. We find that the positron constraints are typically weaker in the lower mass range and stronger in the higher mass range for the spinning primordial black holes compared to the non-spinning ones. They are generally stronger than those derived from the diffuse gamma-ray measurements for primordial black holes having masses greater than a few × 10 16 g.

INTEGRAL constraints on primordial black holes and particle dark matter

“…5, where we see that IN-TEGRAL can rule out PBHs composing the entirety of the DM for masses up to M PBH = 2 × 10 17 g, providing the strongest constraint to date. Our result improves upon that obtained through the flux of electronpositron pairs in the Galaxy, which would then annihilate and emit a line at 511 keV [55][56][57]. Additionally, our constraint is tighter than CMB limits [61], as well as those from Voyager-1 measurements [50].…”

“…Instead, a promising avenue consists of searching for the radiation from ultralight PBHs as they Hawking evaporate [45][46][47][48][49]. Previous works have searched for Hawking-evaporating PBHs through electron-positron pairs [50][51][52][53][54][55][56][57], extra-Galactic gamma rays [58][59][60], and the CMB [61][62][63]. These studies have ruled out PBHs as the entirety of DM for M PBH 10 17 g. Here we search for gamma rays from PBHs in the DM halo around the Milky-Way (MW), which would appear as a modified black-body spectrum in the INTEGRAL data.…”

Primordial black holes as a dark matter candidate

“…There are somewhat tighter constraints (that exclude f PBH = 1 up to M PBH ≈ 2 × 10 17 g) from INTEGRAL measurements of the Galactic diffuse flux in the MeV range [160]. There are also constraints from Super-Kamiokande measurements of the diffuse neutrino background [178].…”

Primordial black holes in Higgs-R2 inflation as the whole of dark matter

“…Taking a reasonable ∆ c value, f PBH peaks with a value of approximately f peak PBH ∼ O (0.1 − 1) in a mass range M PBH ∼ O 10 −17 − O 10 −11 M , covering all of the range allowed for PBHs to dominate as dark matter. Several studies proposed methods including femtolensing and GW observations that directly constrain this mass range [13,101,102], which allows our scenario to be tested in the near future.…”