Non-extremal near-horizon geometries
arXiv:2211.03861 · doi:10.1088/1361-6382/acd980
Abstract
When Gaussian null coordinates are adapted to a Killing horizon, the near-horizon limit is defined by a coordinate rescaling and then by taking the regulator parameter to be small, as a way of zooming into the horizon hypersurface. In this coordinate setting, it is known that the metric of a non-extremal Killing horizon in the near-horizon limit is divergent, and it has been a common practice to impose extremality in order to set the divergent term to zero. Although the metric is divergent, we show for a class of Killing horizons that the vacuum Einstein's equations can be separated into a divergent and a finite part, leading to a well-defined minimal set of Einstein's equations one needs to solve. We extend the result to Einstein gravity minimally coupled to a massless scalar field. We also discuss the case of Einstein gravity coupled to a Maxwell field, in which case the separability holds if the Maxwell potential has non-vanishing components only in the directions of the horizon spatial cross section.
arXiv commentv2: 14 pages, comment added regarding the validity of the result to a class of near-horizon geometries where higher order corrections to equation (1.4) are set to zero. Section 1.3.1 added on applications of the result. Version accepted for publication in Classical and Quantum Gravity
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