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SUMMARY:Gravitational atom spectroscopy
DTSTART:20260226T143000Z
DTEND:20260226T160000Z
DTSTAMP:20260620T225633Z
UID:ef01c437-3847-400c-9b49-6453fe5727eb
SEQUENCE:1
CREATED:20260220T154507Z
DESCRIPTION: Massive scalar fields can form bound clouds around black hole
 s. Independently of the initial data\, after an initial transient\, these 
 scalar clouds are well described by gravitational atoms\, where the scalar
  field settles into a superposition of quasi-bound states. In a quasi-boun
 d state\, the scalar field oscillates with a proper complex frequency\, de
 cays in time\, has an ingoing wave behaviour at the horizon and exponentia
 lly decays at spatial infinity. Previous results suggest that scalar cloud
 s can be detectable during the inspiral-merger-ringdown. We quantify the e
 ffect of these scalar clouds on the ringdown by computing the shift of the
  fundamental quasi-normal mode in the axial sector. We found that for comp
 act enough configuration\, these shifts are in principle detectable even w
 ith current detectors.  
LAST-MODIFIED:20260220T154507Z
LOCATION:DF Seminar Room (2-8.3)\, 2nd floor of Physics Building
URL:http://df.vps.tecnico.ulisboa.pt/en/events/gravitational-atom-spectros
 copy/
X-ALT-DESC;FMTTYPE=text/html:<p data-block-key="oh6zg"> Massive scalar fie
 lds can form bound clouds around black holes. Independently of the initial
  data\, after an initial transient\, these scalar clouds are well describe
 d by gravitational atoms\, where the scalar field settles into a superposi
 tion of quasi-bound states. <br/><br/>In a quasi-bound state\, the scalar 
 field oscillates with a proper complex frequency\, decays in time\, has an
  ingoing wave behaviour at the horizon and exponentially decays at spatial
  infinity. Previous results suggest that scalar clouds can be detectable d
 uring the inspiral-merger-ringdown. <br/><br/>We quantify the effect of th
 ese scalar clouds on the ringdown by computing the shift of the fundamenta
 l quasi-normal mode in the axial sector. We found that for compact enough 
 configuration\, these shifts are in principle detectable even with current
  detectors.  </p>
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