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arxiv 1706.07460 v2 pith:HUKBYC7F submitted 2017-06-22 gr-qc astro-ph.HEhep-th

An analytical approximation for the Einstein-dilaton-Gauss-Bonnet black hole metric

classification gr-qc astro-ph.HEhep-th
keywords blackholeanalyticalapproximationfractionmetricconstructcontinued
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We construct an analytical approximation for the numerical black hole metric of P. Kanti, et. al. [PRD54, 5049 (1996)] in the four-dimensional Einstein-dilaton-Gauss-Bonnet (EdGB) theory. The continued fraction expansion in terms of a compactified radial coordinate, used here, converges slowly when the dilaton coupling approaches its extremal values, but for a black hole far from the extremal state, the analytical formula has a maximal relative error of a fraction of one percent already within the third order of the continued fraction expansion. The suggested analytical representation of the numerical black hole metric is relatively compact and good approximation in the whole space outside the black hole event horizon. Therefore, it can serve in the same way as an exact solution when analyzing particles' motion, perturbations, quasinormal modes, Hawking radiation, accreting disks and many other problems in the vicinity of a black hole. In addition, we construct the approximate analytical expression for the dilaton field.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Ces\`aro convergence of the high-order WKB method and its applications to black-hole overtones and long-lived modes

    gr-qc 2026-05 unverdicted novelty 6.0

    High-order WKB with Padé approximants and Cesàro means enables computation of black-hole overtones and long-lived quasinormal modes, with a noted limitation that apparent convergence can be incorrect for some metrics.

  2. Quasi-resonances in the vicinity of Einstein-Maxwell-dilaton black hole

    gr-qc 2026-04 unverdicted novelty 5.0

    Increasing the mass of a perturbing scalar field around Einstein-Maxwell-dilaton black holes strongly suppresses damping in several quasinormal branches, producing quasi-resonant long-lived oscillations.