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SUMMARY:Zhen Zhong "Instability and backreaction of massive spin-2 fields 
 around black holes"
DTSTART:20260401T103000Z
DTEND:20260401T123000Z
DTSTAMP:20260503T013300Z
UID:indico-event-51659@agenda.infn.it
CONTACT:zhen.zhong@uniroma1.it
DESCRIPTION:Ultralight bosonic fields are compelling dark matter candidate
 s. In particular\, massive spin-2 fields can not only extract energy from 
 rotating black holes via superradiant instabilities but also trigger a uni
 que monopolar instability—specifically\, the axisymmetric (azimuthal num
 ber m = 0) instability—which can even affect non-rotating black holes. T
 his instability dominates in most of the parameter space and could potenti
 ally influence all black holes\, from stellar-mass to supermassive. A thor
 ough understanding of its nonlinear evolution and final state is therefore
  of great importance. In this work\, based on ghost-free massive gravity t
 heories (dRGT and the Hassan–Rosen bigravity theory)\, we employ time-do
 main evolution methods to systematically investigate the nonlinear dynamic
 s of this instability in a spherically symmetric black hole background. Ou
 r results show that the final outcome of the evolution depends on the mode
 l parameters: the system can either evolve into a stable "hairy" black hol
 e or experience a breakdown of the theory itself due to nonlinear effects.
  This study provides important insights into the nonlinear dynamics of mas
 sive gravity theories and paves the way for testing ultralight spin-2 dark
  matter models through astronomical observations.\n\nhttps://agenda.infn.i
 t/event/51659/
LOCATION:Sala Lauree (Marconi Building) (La Sapienza)
URL:https://agenda.infn.it/event/51659/
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