Theoretical research about constraints on extended gravity theory

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Applying AdS/CFT correspondence to a brane world model, it is expected that an asymptotically flat static black hole which is localized on the brane does not exist. In contrast, in asymptotic AdS case, the existence of black holes is anticipated. By examining such asymptotic AdS black holes, we clarified that one can apply AdS/CFT correspondence to this system. In addition, we developed research about how strongly one can pose constraints on possible modification to the gravity theory from the observation of gravitational waves.