题  目：The positive energy theorem for asymptotically de Sitter spacetimes

报告人：张晓教授

时  间：11月16日15:00pm

地  点：管理科研楼1518

摘  要：De Sitter spacetime can be separated into two parts along two kinds of hypersurfaces and the half-de Sitter spacetimes are covered by the planar and hyperbolic coordinates respectively. Two positive mass theorems were proved previously for certain P-asymptotically de Sitter and H-asymptotically de Sitter initial data sets in joint work with
M. Luo and N. Xie. These initial data sets are asymptotic to time slices of the two kinds of half-de Sitter spacetimes respectively, and their mean curvatures are bounded above by certain constants. When the mean curvatures violate these conditions, the spacelike hypersurfaces are constructed in a joint work with Z. Liang, which have negative total energy in the two kinds of half-de Sitter spacetimes.

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