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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2603.16508 |
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| _version_ | 1866910056224653312 |
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| author | Xiao, Shuo Zhang, Shuang-Nan |
| author_facet | Xiao, Shuo Zhang, Shuang-Nan |
| contents | A nearby primordial-black-hole (PBH) evaporation burst would produce a curved gamma-ray wavefront, leading to detectable departures from plane-wave inter-satellite delays. We introduce a purely geometric method that combines imaging localizations with multi-spacecraft timing to determine the distance of a gamma-ray transient. Applied to \textit{Swift}-localized short GRBs, the current sample shows no significant deviation from the plane-wave expectation, with the most constraining event reaching $1.2$ AU and already probing a meaningful Solar-System-scale regime. Our analysis shows that direct distance measurements are achievable to $10^3$ AU scales with the current and near-future technical capabilities. Once a finite source distance is measured, the corresponding PBH mass and lifetime can be directly inferred. Future wide-field localization and long-baseline deep-space gamma-ray detectors could extend such searches to $10^5$ AU and beyond. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_16508 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Geometric Search for Hawking Radiation from Nearby Primordial Black Holes Xiao, Shuo Zhang, Shuang-Nan Instrumentation and Methods for Astrophysics High Energy Astrophysical Phenomena A nearby primordial-black-hole (PBH) evaporation burst would produce a curved gamma-ray wavefront, leading to detectable departures from plane-wave inter-satellite delays. We introduce a purely geometric method that combines imaging localizations with multi-spacecraft timing to determine the distance of a gamma-ray transient. Applied to \textit{Swift}-localized short GRBs, the current sample shows no significant deviation from the plane-wave expectation, with the most constraining event reaching $1.2$ AU and already probing a meaningful Solar-System-scale regime. Our analysis shows that direct distance measurements are achievable to $10^3$ AU scales with the current and near-future technical capabilities. Once a finite source distance is measured, the corresponding PBH mass and lifetime can be directly inferred. Future wide-field localization and long-baseline deep-space gamma-ray detectors could extend such searches to $10^5$ AU and beyond. |
| title | Geometric Search for Hawking Radiation from Nearby Primordial Black Holes |
| topic | Instrumentation and Methods for Astrophysics High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2603.16508 |