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Speaker 1: Nami Uchikata Title : "New solutions of charged regular black holes and their stability" Abstract : Regular black holes are black holes without spacetime singularities. We construct one of regular black hole models, which is composed of de Sitter and Reissner-Nordstrom spacetimes separated by a thin shell. We have assumed the shell is dust and timelike. We have numerically obtained new solutions of such a regular black hole model and also examined the stability against the radial displacement of the shell. The black hole parameters of the stable solutions obtained in this study range in 0.87L < m < 2L and Q/m > 0.86, where m, L, and Q are the mass of the black hole, de Sitter horizon radius and charge of the black hole, respectively. Speaker 2: Chunshan Lin TBA |