Talk detail

Participant	Wondrak, Michael Florian
Institution	Frankfurt Institute for Advanced Studies (FIAS) - Ruth-Moufang-Str. 1 - Frankfurt am Main - Hessen - Germany

Session	AT1	Accepted		Order	Time
Talk	Oral abstract	Title	Superradiance in Rotating MOG Black Holes
Coauthors
Abstract	As an alternative to the introduction of dark matter, John Moffat proposed Modified Gravity (MOG), a covariant extension of general relativity by a fifth force. In this theory, the gravitational interaction is weakened on small distances due to the presence of a massive mediating vector field. The relative difference between the effective gravitational constants on large and on small scales is denoted by the parameter á. Black hole solutions in MOG differ from those in general relativity in several properties, e.g., the shape and size of the black hole shadow. This allows an in principal constraint on á by observation. In this talk, we investigate superradiance of rotating MOG black holes. Superradiance stands for the amplification of a classical field amplitude in a scattering process with a black hole. This process extracts energy from the black hole similar to the Penrose effect for classical particles. We calculate the impact of á on the critical frequency, below which superradiance occurs.
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