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Hunting Primordial Black Hole Dark Matter in Lyman-$\alpha$ Forest by Saha, Akash Kumar; Singh, Abhijeet; Parashari, Priyank; Laha, Ranjan is a scholarly article available to read on EtoBox.

What is Hunting Primordial Black Hole Dark Matter in Lyman-$\alpha$ Forest about?

A very pressing question in contemporary physics is the identity of Dark Matter (DM), and one that has not been answered affirmatively to any degree so far. Primordial Black Holes (PBHs) are one of the most well-motivated DM candidates. Light enough PBHs have been constrained by either the non-detection of their Hawking radiation itself, or by the non-observation of any measurable effects of this radiation on astrophysical and cosmological observables. We constrain the PBH density by their Hawking radiation effect on the intergalactic medium (IGM) temperature evolution. We use the latest deductions of IGM temperature from Lyman-$\alpha$ forest observations. We put constraints on the fraction of PBH DM with masses $5 \times 10^{15}$ g - $10^{17}$ g separately for spinning and non-spinning BHs. We derive constraints by dealing with the heating effects of the astrophysical reionization of the IGM in two ways. In one way, we completely neglect this heating due to astrophysical sources, thus giving us weaker constraints, but completely robust to the reionization history of the universe. In the second way, we utilise some modelling of the ionization and temperature history, and use it to

Author

Saha, Akash Kumar; Singh, Abhijeet; Parashari, Priyank; Laha, Ranjan

Published

2024

Language

EN