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Hořava Gravity after GW170817
A. Emir Gumrukcuoglu, Mehdi Saravani, Thomas P. Sotiriou
The recent detection of gravitational wave GW170817 has placed a severe bound on the deviation of the speed of gravitational waves from the speed of light. We explore the consequen…
Spontaneous scalarization of black holes and compact stars from a Gauss-Bonnet coupling
Hector O. Silva, Jeremy Sakstein, Leonardo Gualtieri +2
We identify a class of scalar-tensor theories with coupling between the scalar and the Gauss-Bonnet invariant that exhibit spontaneous scalarization for both black holes and compac…
Detecting Lorentz Violations with Gravitational Waves from Black Hole Binaries
Thomas P. Sotiriou
Gravitational wave observations have been used to test Lorentz symmetry by looking for dispersive effects that are caused by higher order corrections to the dispersion relation. In…
Constructing Neutron Stars with a Gravitational Higgs Mechanism
Nicola Franchini, Andrew Coates, Thomas P. Sotiriou
In scalar-tensor theories, spontaneous scalarization is a phase transition that can occur in ultra-dense environments such as neutron stars. The scalar field develops a non-trivial…
Black hole horizons at the extremal limit in Lorentz-violating gravity
Nicola Franchini, Mehdi Saravani, Thomas P. Sotiriou
Lorentz-violating gravity theories with a preferred foliation can have instantaneous propagation. Nonetheless, it has been shown that black holes can still exist in such theories a…