School of Particles and Accelerator  July 11, 2007 
DoubleHorizon Limit, AdS Geometry and Entropy FunctionMr. Reza Fareghbal from SUT, IPM 

 Abstract: By starting from a generic metric which describes four dimensional stationary black holes in an arbitrary theory of gravity , we show that the AdS near horizon geometry is a consequence of ﬁniteness and doublehorizon limit. For the neutral and electrically charged rotating black holes in some theories of gravity such as f(RT gravity which are described by this general metric , we show that applying this limit in the equations of motion results a set of decoupled equations at the horizon which can be solved and give the near horizon parameters. It is shown that these decoupled equations come from variation of a function like entropy function which is evaluated at the horizon by imposing doublehorizon limit and without going to the nearhorizon coordinate. We simplify Wald formula at the horizon by using this limit and get the results similar to the entropy function method.
Time: July 11, 2007  


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