Schwarzschild/CFT from soft black hole hair?

Understand

Recent studies of asymptotic symmetries suggest, that a Hamiltonian phase space analysis in gravitational theories might be able to account for black hole microstates.

• In this context we explain, why the use of conventional Bondi fall-off conditions for the gravitational field is too restrictive in the presence of an event horizon.
• This implies an enhancement of physical degrees of freedom ($\mathcal{A}$-modes).
• They provide new gravitational hair and are responsible for black hole microstates.