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SUMMARY:Super Rad Reverberations
DTSTART:20261021T100000Z
DTEND:20261021T120000Z
DTSTAMP:20261013T203400Z
UID:indico-event-2728@indico.ifae.es
CONTACT:psesma@ifae.es
DESCRIPTION:Speakers: David Cyncynates (ICTP Trieste)\n\nBlack hole superr
 adiance can populate the surroundings of rapidly spinning black holes with
  dense clouds of ultralight bosons. If these fields interact with Standard
  Model particles\, their presence may leave observable signatures in the e
 mission from surrounding accretion discs. In this talk\, I will explore ho
 w Fe K$\\alpha$ fluorescence lines can be used to search for such clouds i
 n black hole X-ray binary systems. Focusing on a quadratic coupling to ele
 ctrons\, I will show how coherent oscillations of the bosonic field modify
  the energy of the Fe K$\\alpha$ atomic transition\, producing characteris
 tic time-dependent distortions of the observed X-ray spectrum. I will pres
 ent a matched-template search strategy and forecasts for its sensitivity\,
  accounting for the stochastic variability of the X-ray corona and the dyn
 amical response of the accretion disc. For representative benchmark parame
 ters\, discovery sensitivity may be achievable with week-scale exposure ti
 mes\, placing this approach within reach of existing X-ray telescopes and 
 archival datasets depending on the model parameters. Finally\, I will disc
 uss prospects for extending these searches to a broader range of superradi
 ant cloud phenomenology\, including axionlike particles.\n\n \n\n\nhttps:
 //indico.ifae.es/event/2728/
LOCATION:C7b/058 - Seminar (IFAE Main Building C7b)
URL:https://indico.ifae.es/event/2728/
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