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SUMMARY:HECAP Seminar by Gerardo Garcia Moreno - Semiclassical Effects in 
 Ultramassive Spacetimes
DTSTART;VALUE=DATE-TIME:20261110T150000Z
DTEND;VALUE=DATE-TIME:20261110T160000Z
DTSTAMP;VALUE=DATE-TIME:20261111T113340Z
UID:indico-event-11557@ictp.it
DESCRIPTION:\n	Abstract\n	A recent work [Senovilla\, Port. Math. 80 (2023)
 ] has shown that accretion of matter by a Schwarzschild-de Sitter black ho
 le can take this object beyond a critical limit where the event and cosmol
 ogical horizons coalesce\, and transform it into a collapsing universe res
 embling a Kantowski–Sachs cosmology. In these configurations\, dubbed ul
 tra-massive spacetimes\, future asymptotic infinity and the event horizon 
 associated with the black hole cease to exist. In this work\, we take the 
 first steps toward exploring semiclassical gravity effects on such geometr
 ies. In particular\, we examine the fate of Hawking radiation in these bac
 kgrounds and analyze the behavior of the renormalized stress-energy tensor
 . We also explore the effect of semiclassical backreaction on the evolutio
 n of the horizon.Based on arXiv:2610.29857 [gr-qc]. \n	 \n\n	Link to Zoom
  registrationhttps://zoom.us/meeting/register/06LZvMT4QquVwvihUIE2Ng\n	 \
 n\n//indico.ictp.it/event/11557/
LOCATION:Hybrid Leonardo Building - Luigi Stasi Seminar Room and via Zoom
URL://indico.ictp.it/event/11557/
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