Lecture notes prepared for the 2021 SAGEX PhD School in Amplitudes hosted by the
University of Copenhagen August 10th through 13th. Topics covered include: the …

We review recent developments on the thermodynamics of black holes in extended phase
space, where the cosmological constant is interpreted as thermodynamic pressure and …

The possibility that the dark matter comprises primordial black holes (PBHs) is considered,
with particular emphasis on the currently allowed mass windows at 1 0 16–1 0 17 g, 1 0 20 …

A short, graduate-level synthesis of recent developments in theoretical physics, from a
pioneer in the field Lectures on the Infrared Structure of Gravity and Gauge Theory presents …

We study a two-dimensional dilaton gravity system, recently examined by Almheiri and
Polchinski, which describes near-extremal black holes, or more generally, nearly A d S 2 …

We review recent progress on the information paradox. We explain why exponentially small
correlations in the radiation emitted by a black hole are sufficient to resolve the original …

A bstract In the 1980's, work by Coleman and by Giddings and Strominger linked the physics
of spacetime wormholes to 'baby universes' and an ensemble of theories. We revisit such …

We provide evidence that the classical scattering of two spinning black holes is controlled by
the soft expansion of exchanged gravitons. We show how an exponentiation of Cachazo …

A bstract It is shown that black hole spacetimes in classical Einstein gravity are
characterized by, in addition to their ADM mass M, momentum\(\overrightarrow {P}\), angular …

I argue that a version of the quantum-corrected Ryu–Takayanagi formula holds in any
quantum error-correcting code. I present this result as a series of theorems of increasing …