Designer black holes from new 2D gravity

Understand

We present a family of extensions of spherically symmetric Einstein-Lanczos-Lovelock gravity.

• The field equations are second order and obey a generalized Birkhoff's theorem.
• The Hamiltonian constraint can be written in terms of a generalized Misner-Sharp mass function that determines the form of the vacuum solution.
• The action can be designed to yield interesting non-singular black-hole spacetimes as the unique vacuum solutions, including the Hayward black hole as well as a completely new one.