Rotating Black Holes in Higher Order Gravity

Abstract

We develop a new technique for finding black hole solutions in modified gravity that have "stealth" hair, i.e., hair whose only gravitational effect is to tune the cosmological constant. We consider scalar-tensor theories in which gravitational waves propagate at the speed of light, and show that Einstein metrics can be painted with stealth hair provided there exists a family of geodesics always normal to spacelike surfaces. We also present a novel scalar-dressed rotating black hole that has finite scalar field at both the black hole and cosmological event horizons.

5 pages, 3 figures

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• High precision numerical sequences of rotating hairy black holes
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• Quantifying closeness between black hole spacetimes: a superspace approach
• Shadow of a disformal Kerr black hole in quadratic DHOST theories
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• Recent Developments in Degenerate Higher Order Scalar Tensor Theories
• Theoretical filters for shift-symmetric Horndeski gravities
• Spherically symmetric, static black holes with scalar hair, and naked singularities in nonminimally coupled k-essence
• Testing the Non-circularity of the Spacetime around Sagittarius A* with Orbiting Pulsars