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Ayon Tarafdar (Memorial University of Newfoundland)18/06/2024, 09:00Oral
In this talk, I explore the determination of an event horizon candidate for slowly evolving dynamical black holes (BHs). Such a candidate has been termed as a slowly evolving null surface (SENS). Such surfaces are of interest because they coincide with the event horizon and are causal, unlike apparent horizons. Moreover, known laws of BH mechanics can be established for these slowly evolving...
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Dipanjan Dey (Dalhousie University, Canada)18/06/2024, 09:30Oral
In this talk, I will define the photon surface conditions using Cartan scalars within an invariant spin frame which offers a comprehensive description of the local spacetime geometry. By employing this approach, one can gain novel insights into the geometry and dynamics of photon surfaces, independent of the global spacetime structure. I will first discuss the photon surface conditions in a...
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Matin Tavayef18/06/2024, 10:00Oral
We construct a family of local static, vacuum five-dimensional solutions with two commuting spatial isometries describing a black hole with an $S^3 $ horizon and a 2-cycle ‘bubble’ in the domain of outer communications. The solutions are obtained by adding distortions to an asymptotically flat seed solution. We show that the conical singularities in the undistorted geometry can be removed by...
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