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СЕМИНАРЫ |
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Bimetric and multimetric theories of gravity [Биметрическая и мультиметрическая теории гравитации] Фавад Хассан Stockholm University |
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Аннотация: It is well known that the interactions of the gravitational metric with other spin-2 fields are strongly constrained by the absence of ghost instabilities. In this talk I will outline the theoretical motivations for the study of such theories and then describe the ghost free theories of two interacting spin-2 fields (often called bimetric theories) and their known extensions to multiple spin-2 fields (multimetric theories). I will also describe an interesting geometrical aspect of such theories which is relevant for the existence of a consistent notion of space and time in the theory. Язык доклада: английский |