Physical black holes in fourth-order gravity

Black holes in three-dimensional topological gravity.

Vortices and black holes in dilatonic gravity

The extrapolation of the black hole ‘no-hair’ conjecture, initially proposed by Ruffini and Wheeler [1] and stating that a stationary black hole is uniquely determined by its mass, electromagnetic charge and angular momentum, to the stronger statement of ‘no dressing’ of the horizon, has been proven to be false [2], [3]. A common feature of such ‘counterexamples’ is that they involve nontrivial...

Astrophysical black holes in screened modified gravity

Chameleon, environmentally dependent dilaton, and symmetron gravity are three models of modified gravity in which the effects of the additional scalar degree of freedom are screened in dense environments. They have been extensively studied in laboratory, cosmological, and astrophysical contexts. In this paper, we present a preliminary investigation into whether additional constraints can be pro...

Non-singular Gravity without Black Holes Non-singular Gravity without Black Holes

Canada " What are the everywhere regular solutions of these field equations? " Abstract A non-singular static spherically symmetric solution of the nonsymmetric gravita-tional and electromagnetic theory (NGET) field equations is derived, which depends on the four parameters m, ℓ 2 , Q and s, where m is the mass, Q is the electric charge, ℓ 2 is the NGT charge of a body and s is a dimensionless ...

Black Holes in Einstein - Lovelock Gravity ∗

Static, spherically symmetric solutions of the field equations for a particular dimensional continuation of general relativity with negative cosmological constant are found. In even dimensions the solution has many similarities with the Schwarzschild metric. In odd dimensions, the equations of motion are explicitly anti de-Sitter invariant, and the solution is alike in many ways to the 2+1 blac...