Future Constraints on Primordial Black Holes from XGIS-THESEUS

TL;DR

This paper investigates how upcoming X-ray and gamma-ray telescopes on the THESEUS mission could set new constraints on primordial black holes in the asteroid mass range, potentially surpassing current limits especially for rotating black holes.

Contribution

It demonstrates that the XGIS-THESEUS mission can provide the strongest bounds on non-rotating and rotating primordial black holes within specific mass ranges, improving existing constraints.

Findings

Projected limits are comparable with existing literature for certain mass ranges.

XGIS-THESEUS can provide the strongest bounds for non-rotating PBHs between 10^{17} and 3×10^{18} grams.

Bounds are nearly an order of magnitude more stringent for maximally rotating PBHs in the mass range 5×10^{15} to 10^{19} grams.

Abstract

Current observations allow Primordial Black Holes (PBHs) in asteroid mass range $10^{17}-10^{22}$ g to constitute the entire dark matter (DM) energy density (barring a small mass range constrained by 21 cm observations). In this work, we explore the possibility of probing PBH with masses $10^{17}-10^{19}\,{\rm g}$ via upcoming X and Gamma Imaging Spectrometer (XGIS) telescope array on-board the Transient High-Energy Sky and Early Universe Surveyor (THESEUS) mission. While our projected limits are comparable with those proposed in the literature for $10^{16}\,{\rm g}\,<\,M_{\mathrm{PBH}}\,<\,10^{17}\,{\rm g}$, we show that the XGIS-THESEUS mission can potentially provide the strongest bound for $10^{17} \mathrm{~g}<M_{\mathrm{PBH}} \lesssim 3\times 10^{18} \mathrm{~g}$ for non-rotating PBHs. The bounds become more stringent by nearly an order of magnitude for maximally rotating PBHs in the mass range $5\times10^{15}\,{\rm g}\,<\,M_{\rm PBH}\,\lesssim\,10^{19}\,{\rm g}$.