# Evolution of electromagnetic and Dirac perturbations around a black hole in Horava gravity - General Relativity and Quantum Cosmology

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Abstract: The evolution of electromagnetic and Dirac perturbations in the spacetimegeometry of Kehagias-SfetsosKS black hole in the deformed Horava-LifshitzHLgravity is investigated and the associated quasinormal modes are evaluatedusing time domain integration and WKB methods. We find a considerable deviationin the nature of field evolution in HL theory from that in the Schwarzschildspacetime and QNMs region extends over a longer time in HL theory before thepower-law tail decay begins. The dependence of the field evolution on the HLparameter $\alpha$ are studied. In the time domain picture we find that thelength of QNM region increases with $\alpha$. But the late time decay of fieldfollows the same power-law tail behavior as in the case of Schwarzschild blackhole.

Autor: Nijo Varghese, V C Kuriakose

Fuente: https://arxiv.org/