Discretely Charged Dark Matter in Inflation Models Based on Holographic Space-time

TL;DR

This paper proposes a model where tiny primordial black holes with discrete charges, originating from holographic space-time inflation, could account for dark matter, fitting cosmological observations with a small fraction of charged black holes.

Contribution

It introduces a novel inflationary dark matter model involving discretely charged primordial black holes within the holographic space-time framework.

Findings

Charged black holes constitute a plausible dark matter candidate.

The model matches the observed matter-radiation equality temperature.

The fraction of charged black holes is estimated to be around 2×10^{-9}.

Abstract

The Holographic Space-time (HST) model of inflation has a potential explanation for dark matter as tiny primordial black holes. Motivated by a recent paper of Barrau\cite{barrau} we propose a version of this model where some of the Inflationary Black Holes (IBHs), whose decay gives rise to the Hot Big Bang, carry the smallest value of a discrete symmetry charge. The fraction $f$ of IBHs carrying this charge is difficult to estimate from first principles, but we fix it by requiring that the crossover between radiation and matter domination occurs at the correct temperature $T_{eq} \sim 1 eV = 10^{-28} M_P$. The fraction is small, $f \sim 2\times 10^{-9}$ so we believe this gives an extremely plausible model of dark matter.