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Spinning Black Holes in Modified Gravity via Spectral Methods
Kelvin Ka-Ho Lam1, Adrian Ka-Wai Chung1,2, Nicolás Yunes1
1University of Illinois Urbana-Champaign, Illinois Center for Advanced Studies of the Universe and Department of Physics, Urbana, Illinois 61801, USA.
Abstract:
Rapidly rotating black-hole spacetimes outside general relativity are key to many tests of Einstein's theory. We here develop an efficient spectral method to represent such spacetimes analytically, in closed-form, and to high accuracy, in a large class of effective-field-theory extensions of general relativity. We exemplify this method by constructing, for the first time, closed-form and analytic representations of spinning black holes in scalar-Gauss-Bonnet, dynamical Chern-Simons, and axidilaton gravity to an accuracy better than 10^{-8} for all dimensionless spins below 0.99.
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