7-11 September 2015
Warsaw, Poland
Europe/Zurich timezone

Bigravity from gradient expansion in DGP 2-brane model

8 Sep 2015, 12:37
Warsaw, Poland

Warsaw, Poland

University of Warsaw, 26/28 Krakowskie Przedmiescie Street in the building of the Old Library


Yasuho Yamashita (Yukawa Institute for Theoritical Physics, Japan)


Recently the ghost-free bigravity, the gravitational theory which contains two metrics interacting each other, is constructed by tuning the interaction terms to remove Boulware-Deser ghost. Using this model, we can realize the late-time cosmic accelerating expansion and the gravitational wave has a charasteristic feature. However, we have no idea what is the mechanism which tunes the interaction terms to the specific ones derived by the ghost-free condition technically. Therefore, we tried to derive the ghost-free bigravity as an low-energy effective theory of DGP 2-brane model. I will talk about the attempt to obtain a bigravity model by solving the bulk metric with the gradient expansion and how this bigravity model behaves compared with the ghost-free bigravity.

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