Publikace ÚTF

Decreasing entropy of dynamical black holes in critical gravity

Maeda, H., Švarc, R. and 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.
typ:article
journal:J. High Energy Phys.
volume:06
pages:118
year:2018
pacs:https://doi.org/10.1007/JHEP06(2018)118

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