TY  - JOUR
AU  - Agius, D.
AU  - Essig, R.
AU  - Gaggero, D.
AU  - Scarcella, F.
AU  - Suczewski, G.
AU  - Valli, M.
PY  - 2024
DA  - 2024//
TI  - Feedback in the dark: a critical examination of CMB bounds on primordial black holes
T2  - J. Cosmol. Astropart. Phys.
JO  - Journal of Cosmology and Astroparticle Physics
SP  - 003
EP  - 36pp
VL  - 07
IS  - 7
PB  - IOP Publishing Ltd
KW  - accretion
KW  - cosmological parameters from CMBR
KW  - dark matter theory
KW  - primordial black holes
AB  - If present in the early universe, primordial black holes (PBHs) would have accreted matter and emitted high-energy photons, altering the statistical properties of the Cosmic Microwave Background (CMB). This mechanism has been used to constrain the fraction of dark matter that is in the form of PBHs to be much smaller than unity for PBH masses well above one solar mass. Moreover, the presence of dense dark matter mini -halos around the PBHs has been used to set even more stringent constraints, as these would boost the accretion rates. In this work, we critically revisit CMB constraints on PBHs taking into account the role of the local ionization of the gas around them. We discuss how the local increase in temperature around PBHs can prevent the dark matter mini -halos from strongly enhancing the accretion process, in some cases significantly weakening previously derived CMB constraints. We explore in detail the key ingredients of the CMB bound and derive a conservative limit on the cosmological abundance of massive PBHs.
SN  - 1475-7516
UR  - https://arxiv.org/abs/2403.18895
UR  - https://doi.org/10.1088/1475-7516/2024/07/003
DO  - 10.1088/1475-7516/2024/07/003
LA  - English
N1  - WOS:001262242300001
ID  - Agius_etal2024
ER  -