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BEGIN:VEVENT
UID:6202@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20220107T110000
DTEND;TZID=Europe/Paris:20220107T123000
DTSTAMP:20241120T200934Z
URL:https://www.i2m.univ-amu.fr/evenements/conformally-flat-spacetimes-wit
 h-complete-photons/
SUMMARY:Rym SMAÏ (LMA\, Université d’Avignon): Conformally flat spaceti
 mes with complete photons
DESCRIPTION:Rym SMAÏ: In 2013\, Rossi proved that if a maximal globally hy
 perbolic (abbrev. MGH) conformally flat spacetime has two distinct homotop
 ic lightlike geodesics with the same ends then it is a finite quotient of 
 the Einstein universe. In this case\, the ends of such lightlike geodesics
  are said to be conjugate.\nIn the continuity of this result\, I am intere
 sted in describing MGH conformally flat spacetimes with complete lightlike
  geodesics (i.e. which develop as lightlike geodesics joining two conjugat
 e points in the Einstein universe). In this talk\, I will describe an exam
 ple that I call a Misner domain of the Einstein universe.\nUnder some hypo
 thesis\, I prove that the universal covering of a MGH conformally flat spa
 cetime with complete lightlike geodesics contains a Misner strip.\nThe goa
 l would be to prove that any MGH Cauchy compact conformally flat spacetime
  can be obtained by grafting (or removing) a Misner strip from another one
 . This would be the Lorentzian analogous of the operation of grafting on h
 yperbolic surfaces introduced by Thurston.\n\nLien Zoom : \n\n\nhttps://u
 niv-amu-fr.zoom.us/j/96198593810?pwd=MnZRY3RMT1h3UVFsaExHSWNRMkl6Zz09\n\nM
 eeting ID: 961 9859 3810\n\nPasscode: voir mail\n\n&nbsp\;\n\n
ATTACH;FMTTYPE=image/jpeg:https://www.i2m.univ-amu.fr/wp-content/uploads/2
 021/10/Rym_Smai.jpg
CATEGORIES:Séminaire,Hybrid,Rauzy
LOCATION:Saint-Charles - FRUMAM  (2ème étage)\, 3 Place Victor Hugo\, Mar
 seille\, 13003\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=3 Place Victor Hugo\, Marse
 ille\, 13003\, France;X-APPLE-RADIUS=100;X-TITLE=Saint-Charles - FRUMAM  (
 2ème étage):geo:0,0
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