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SUMMARY:Exotic Compact  Objects with  Reflecting Surfaces
DTSTART:20240919T143000Z
DTEND:20240919T160000Z
DTSTAMP:20260420T001308Z
UID:fd990b86-6516-4e7b-b4b9-6a03aeefd952
SEQUENCE:1
CREATED:20240917T193618Z
DESCRIPTION: We perform non-linear simulations of ultra-compact spacetimes
  with a light ring and  an object with a surface that reflects scalar and/
 or gravitational fields.The object&#x27\;s material is  unknown\, but repl
 aced by reflecting boundary\, whose location can be freely chosen. We  inv
 estigate the dependence of the emitted waveforms on the position of the su
 rface and compare  to the non-reflecting case. In the waveforms we are loo
 king on features that are conjectured for  some horizonless ultracompact o
 bjects\, such as echoing signals and a cascade to higher  multipoles 
LAST-MODIFIED:20240917T193618Z
LOCATION:Physics Seminar Room - Physics Building - 2nd floor (2-8.3)
URL:http://df.vps.tecnico.ulisboa.pt/en/events/exotic-compact-objects-with
 -reflecting-surfaces/
X-ALT-DESC;FMTTYPE=text/html:<p data-block-key="q4czd"> We perform non-lin
 ear simulations of ultra-compact spacetimes with a light ring and  an obje
 ct with a surface that reflects scalar and/or gravitational fields.<br/><b
 r/>The object&#x27\;s material is  unknown\, but replaced by reflecting bo
 undary\, whose location can be freely chosen. We  investigate the dependen
 ce of the emitted waveforms on the position of the surface and compare  to
  the non-reflecting case.<br/><br/> In the waveforms we are looking on fea
 tures that are conjectured for  some horizonless ultracompact objects\, su
 ch as echoing signals and a cascade to higher  multipoles </p>
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