Decreasing entropy of dynamical black holes in critical gravity
Maeda, H.; Švarc, R.; Podolský, J.
Critical gravity is a quadratic curvature gravity in four dimensions which
is ghost-free around the AdS background. Constructing a Vaidya-type exact solution,
we show that the area of a black hole defined by a future outer trapping horizon can
shrink by injecting a charged null fluid with positive energy density, so that a black hole
is no more a one-way membrane even under the null energy condition. In addition, the
solution shows that the Wald-Kodama dynamical entropy of a black hole is negative and
can decrease. These properties expose the pathological aspects of critical gravity at the
non-perturbative level.
| type: | article |
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| journal: | J. High Energy Phys. |
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| volume: | 06 |
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| pages: | 118 |
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| year: | 2018 |
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| grants: | Spacetimes and Fields in Einstein's Theory of Gravity and its Generalizations, GAČR 17-01625S; 2017-2019; hlavní řešitel: Jiří Podolský |
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