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- W1971389804 abstract "We study the imaginary part of the Lorentzian gravitational action for bounded regions, as described in arXiv:1301.7041. By comparing to a Euclidean calculation, we explain the agreement between the formula for this imaginary part and the formula for black hole entropy. We also clarify the topological structure of the imaginary part in Lovelock gravity. We then evaluate the action's imaginary part for some special regions. These include cylindrical slabs spanning the exterior of a stationary black hole spacetime, 'maximal diamonds' in various symmetric spacetimes, as well as local near-horizon regions. In the first setup, the black hole's entropy and conserved charges contribute to the action's imaginary and real parts, respectively. In the other two setups, the imaginary part coincides with the relevant entropy." @default.
- W1971389804 created "2016-06-24" @default.
- W1971389804 creator A5088309566 @default.
- W1971389804 date "2013-07-22" @default.
- W1971389804 modified "2023-09-24" @default.
- W1971389804 title "Imaginary part of the gravitational action at asymptotic boundaries and horizons" @default.
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- W1971389804 doi "https://doi.org/10.1103/physrevd.88.024037" @default.
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