Speaker
Thomas Sotiriou
Description
I
will consider black hole solutions in gravity theories that
exhibit
Lorentz invariance violations. I will argue on fairly
general grounds
that one does not expect to have black hole solutions in
such
theories. I will then focus for concreteness on two
specific
Lorentz-violating gravity theories, Einstein-aether theory
and
Horava-Lifshitz gravity, and I will present two surprising
results. First, that in both theories static, spherical black-
hole
solutions do exist, contrary to previous expectations.
Second, that in
Horava-Lifshitz gravity slowly-rotating black holes that
reduce to
these static, spherical black holes at the limit of no
rotation do not
exist. I will discuss the theoretical and astrophysical
implication of
these two results.
