Limits on the Primordial Black Holes Dark Matter with current and future missions

TL;DR

This paper reviews current constraints on primordial black holes as dark matter, highlighting the remaining open mass window and evaluating the potential of upcoming missions to probe this range.

Contribution

It provides a comprehensive overview of existing limits on PBH dark matter and assesses the capabilities of future and next-generation missions to explore the remaining mass window.

Findings

Current limits exclude most PBH mass ranges as dark matter candidates.

The open window in the mass range 3×10^{16}–10^{18} g remains unconstrained.

Future missions like Athena and THESEUS could significantly tighten constraints on PBHs.

Abstract

In this proceeding we consider primordial black holes (PBHs) as a dark matter candidate. We discuss the existing limits on the fraction $f_{pbh}$ of the dark matter constituting of PBHs as a function of PBHs mass. The discussed limits cover almost all possible mass range with the currently only open window in $3\cdot 10^{16}-10^{18}$ g in which the PBHs can make up to 100% of the dark matter content of the universe. We present the estimates of the capabilities of the near-future instruments (Einstein Probe/WXT, SVOM/MXT) and discuss the potential of next-generation missions(Athena, THESEUS, eXTP) to probe this mass range. We discuss the targets most suitable for the PBH dark matter searches with these missions and the potential limiting factor of the systematics on the derived results.