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Mechanics of Isolated Horizons in Scalar-Tensor Theories

Based on the first-order action for scalar-tensor theories with the Immirzi parameter, the symplectic form for the spacetimes admitting a weakly isolated horizon as internal boundary is derived by the covariant phase space approach. The first law of thermodynamics for the weakly isolated horizons with rotational symmetry is obtained. It turns out that the Immirzi parameter appears in the expression of the angular momentum of isolated horizon, and the scalar field contributes to the horizon entropy.

preprint2020arXivOpen access
Shupeng SongYongge Ma
gr-qc
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Shupeng SongYongge Ma

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