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UID:2194@qft.physik.hu-berlin.de
DTSTART;TZID=Europe/Berlin:20241023T133000
DTEND;TZID=Europe/Berlin:20241023T143000
DTSTAMP:20241017T080413Z
URL:https://qft.physik.hu-berlin.de/next-seminars/gerardo-garcia-moreno/
SUMMARY:Gerardo García-Moreno (IAA-CSIC) - 
DESCRIPTION:Speaker: Gerardo García-Moreno\n\nTitle: Dissecting Buchdahl
 ’s limit: A surgeon’s guide to compact objects\n\nAbstract:\nOne of th
 e theoretical motivations behind the belief that black holes as described 
 by general relativity exist in nature is that it is hard to find solutions
  that mimic their properties\, especially their compactness. One of the cl
 assic results that goes in this direction is the so-called Buchdahl limit:
  a bound for the maximum compactness that\, under a few assumptions\, stat
 ic fluid spheres in hydrostatic equilibrium can possibly have. In this tal
 k\, I will highlight two of the main assumptions that could be violated in
  realistic physical situations: isotropy and outward decreasing monotonici
 ty of the density profile\, which\, as I will discuss in detail\, can be u
 nderstood as a form of energy condition. I will illustrate separately how 
 this limit can be overcome as long as any of these two assumptions are rel
 axed. For that purpose\, I will present two toy models exemplifying that v
 iolations of any of these two assumptions can yield objects that are more 
 compact than the Buchdahl limit. I will also discuss how these toy models 
 represent some of the main features of realistic systems\, and how they co
 uld be extended to find more realistic models.
CATEGORIES:Pizza Seminars
LOCATION:Room 1.221\, IRIS building\, Zum großen Windkanal 6\, Berlin\, 12
 489\, Germany
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 erlin\, 12489\, Germany;X-APPLE-RADIUS=100;X-TITLE=Room 1.221\, IRIS build
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