MaxPlanckInstitut für Gravitationsphysik, AlbertEinsteinInstitut  

Fourdimensional Traversable Wormholes and Bouncing Cosmologies in Vacuum 
Starts at:  Tue 15 Jan 2019, 14:00  
Speaker:  Andres Anabalon  Institute:  U. Adolfo Ibanez, Chile 
Abstract:  In this talk we point out the existence of solutions to General Relativity with a negative cosmological constant in four dimensions, which contain solitons as well as traversable wormholes. The latter connect two asymptotically locally AdS4 spacetimes. At every constant value of the radial coordinate the spacetime is a spacelike warped AdS3. We compute the dual energy momentum tensor at each boundary showing that it yields different results. We also show that these vacuum wormholes can have more than one throat and that they are indeed traversable by computing the time it takes for a light signal to go from one boundary to the other, as seen by a geodesic observer. We generalize the wormholes to include rotation and charge. When the cosmological constant is positive we find a cosmology that is everywhere regular, has either one or two bounces and that for late and early times matches the FriedmannLemaitreRobertsonWalker metric with spherical topology.  
TexDocument  
Seminartype:  Ordinary  
Room:  Seminarraum 0.01  
Contact: Matin Mojaza  