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SUMMARY:Static Vacuum Geometry Determines Gravitational Collapse and Cosmo
 logy
DTSTART;VALUE=DATE-TIME:20261107T063000Z
DTEND;VALUE=DATE-TIME:20261107T070000Z
DTSTAMP;VALUE=DATE-TIME:20261023T163751Z
UID:indico-contribution-2936@indico.itp.ac.cn
DESCRIPTION:Speakers: cong zhang (Beijing Normal University)\nBeyond gener
 al relativity\, regular black-hole geometries and modified cosmologies are
  often constructed independently\, raising the question of whether black h
 oles\, gravitational collapse\, and cosmology can still arise as different
  regimes of a common gravitational dynamics. We answer this question by sh
 owing that\, within the covariant spherically symmetric effective Hamilton
 ian framework\, the dynamics of gravity coupled to irrotational dust can b
 e determined directly from a prescribed static vacuum family\, although th
 e Hamiltonian reconstruction of that family is not unique. Requiring the r
 esulting dust dynamics to admit an FLRW sector further yields a necessary 
 and sufficient restriction on the static vacuum family and determines the 
 corresponding modified Friedmann equation. Thus\, static vacuum geometry d
 etermines the collapse dynamics\, while cosmological homogeneity feeds bac
 k to select the admissible static geometries. This generality may be roote
 d in the combined roles of general covariance and Birkhoff's theorem in th
 e underlying theory.\n\nhttps://indico.itp.ac.cn/event/417/contributions/2
 936/
LOCATION:
URL:https://indico.itp.ac.cn/event/417/contributions/2936/
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