Future Constraints on Primordial Black Holes from XGIS-THESEUS

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 $10^{17}-10^{19}\mathrm{g}$ 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 $10^{16}\mathrm{g}<M_{\mathrm{PBH}}<10^{17}\mathrm{g}$, 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 $5\times 10^{15}\mathrm{g}<M_{\mathrm{PBH}}\lesssim 10^{19}\mathrm{g}$.

added references, minor corrections in Fig. 5

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