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SUMMARY:On cosmological properties of black-hole hair in linearly coupled 
 scalar–Gauss–Bonnet theory
DTSTART;VALUE=DATE-TIME:20260522T053000Z
DTEND;VALUE=DATE-TIME:20260522T061000Z
DTSTAMP;VALUE=DATE-TIME:20260530T122554Z
UID:indico-contribution-2438@indico.itp.ac.cn
DESCRIPTION:Speakers: Dražen Glavan (Institute of Physics of the Czech Ac
 ademy of Sciences)\nWe investigate the superhorizon behavior of scalar hai
 r sourced by black holes in de Sitter spacetime in the linearly coupled sh
 ift-symmetric scalar--Gauss--Bonnet theory. This hair exhibits both spatia
 l and temporal growth\, which has been suggested to be problematic. We sho
 w that this growth is expected\, as it is not a special consequence of the
  black hole\, but instead follows from the dynamics of a minimally coupled
  massless scalar field in expanding de Sitter spacetime. Moreover\, it is 
 not specific to black holes\, but also arises for a point scalar charge in
  de Sitter\, indicating that a scalarized black hole acts effectively as a
  localized subhorizon source of scalar perturbations. Backreaction\, when 
 important\, first arises on subhorizon scales and does not by itself elimi
 nate the superhorizon profile. The time-dependent scalar hair also carries
  a steady outward energy flux\, which helps explain the difficulties encou
 ntered in attempts to construct self-consistent static solutions.\n\nhttps
 ://indico.itp.ac.cn/event/419/contributions/2438/
LOCATION:Small Lecture Hall\, Chongqing University Library (图书馆小
 报告厅) 1F-9
URL:https://indico.itp.ac.cn/event/419/contributions/2438/
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