{"id":4551,"date":"2019-09-08T16:50:21","date_gmt":"2019-09-08T14:50:21","guid":{"rendered":"https:\/\/www.oa-cagliari.inaf.it\/seminari\/hermes-grailquest-hunting-for-gravitational-wave-electromagnetic-counterparts-probing-space-time-quantum-foam\/"},"modified":"2019-09-08T16:50:21","modified_gmt":"2019-09-08T14:50:21","slug":"hermes-grailquest-hunting-for-gravitational-wave-electromagnetic-counterparts-probing-space-time-quantum-foam","status":"publish","type":"seminari","link":"https:\/\/www.oa-cagliari.inaf.it\/en\/seminars\/hermes-grailquest-hunting-for-gravitational-wave-electromagnetic-counterparts-probing-space-time-quantum-foam\/","title":{"rendered":"HERMES &amp; GrailQuest: Hunting for Gravitational Wave Electromagnetic Counterparts Probing Space-Time Quantum Foam"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-1649\" src=\"https:\/\/www.oa-cagliari.inaf.it\/wp-content\/uploads\/2025\/09\/2019091309495107565-300x226.png\" alt=\"\" width=\"300\" height=\"226\" srcset=\"https:\/\/www.oa-cagliari.inaf.it\/wp-content\/uploads\/2025\/09\/2019091309495107565-300x226.png 300w, https:\/\/www.oa-cagliari.inaf.it\/wp-content\/uploads\/2025\/09\/2019091309495107565.png 500w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>I discuss how several of the proposed models for space-time quantization predict an energy-dependent speed for photons. Although the predicted discrepancies with the general speed of light are minuscule, I discuss how it is possible to detect this intriguing signature of space-time granularity with a new concept of a modular observatory for photons in the energy band 10 keV\u2212 30 MeV. This observatory may consist of a swarm of micro\/nano-satellites in low orbits. Sub-microsecond time resolution and a wide energy band allow probing tiny energy-dependent delays, expected to be the signature of the granular structure of space-time in several of the proposed theories of Quantum Gravity.<br \/>\nMoreover, this kind of experiment allows performing temporal triangulation of high signal-to-noise impulsive events with positional accuracies of a few arc-seconds, making an observatory like that a promising hunter for the elusive electromagnetic counterparts of Gravitational Waves.   <\/p>\n","protected":false},"template":"","class_list":["post-4551","seminari","type-seminari","status-publish","hentry","categorie_seminari-colloquium"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.oa-cagliari.inaf.it\/en\/wp-json\/wp\/v2\/seminari\/4551","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.oa-cagliari.inaf.it\/en\/wp-json\/wp\/v2\/seminari"}],"about":[{"href":"https:\/\/www.oa-cagliari.inaf.it\/en\/wp-json\/wp\/v2\/types\/seminari"}],"wp:attachment":[{"href":"https:\/\/www.oa-cagliari.inaf.it\/en\/wp-json\/wp\/v2\/media?parent=4551"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}