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SUMMARY:Che-Yu Chen\, "Joining black hole imaging and ringdown: A novel vi
 ew of testing gravity"
DTSTART:20260827T070000Z
DTEND:20260827T090000Z
DTSTAMP:20260821T222900Z
UID:indico-event-1387@indico.ibs.re.kr
DESCRIPTION:Abstract: \nIn geometric-optics limits\, there exists a mappi
 ng connecting black hole images and eikonal black hole quasinormal modes (
 QNMs)\, where the latter characterize the ringdown phase in gravitational 
 wave signals emitted by a perturbed black hole. More explicitly\, the real
  part and imaginary part of the QNM frequencies correspond to the ring siz
 e and the detailed ring structure of the image\, respectively. The explici
 t identification of such eikonal correspondence\, however\, relies a lot o
 n the symmetry of the spacetime under consideration and\, therefore\, is h
 ighly non-trivial. After showing that such a correspondence may be violate
 d in theories beyond GR\, I will discuss how joining the observations of G
 W ringdown and images of black holes could test such a correspondence and 
 constrain a class of modified theories of gravity in which the corresponde
 nce is broken. This kind of joint observation can open a novel window for 
 testing gravity.\n\nhttps://indico.ibs.re.kr/event/1387/
URL:https://indico.ibs.re.kr/event/1387/
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