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Rym Smai

Conformally flat spacetimes with complete photons
Jeudi, 3 Février, 2022 - 14:00
Résumé : 

In 2013, Rossi proved that if a maximal globally hyperbolic (abbrev. MGH) conformally flat spacetime has two distinct homotopic 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. In the continuity of this result, I am interested in describing MGH conformally flat spacetimes with complete lightlike geodesics (i.e. which develop as lightlike geodesics joining two conjugate points in the Einstein universe). In this talk, I will describe an example that I call a Misner domain of the Einstein universe. Under some hypothesis, I prove that the universal covering of a MGH conformally flat spacetime with complete lightlike geodesics contains a Misner strip. The goal 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 hyperbolic surfaces introduced by Thurston.

Institution de l'orateur : 
Thème de recherche : 
Théorie spectrale et géométrie
Salle : 
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