The accelerated expansion of space during the cosmological inflation period leads to trans-
Planckian issues which need to be addressed. Most importantly, the physical wavelength of …

This white paper summarizes recent progress in the cosmological bootstrap, an approach to
the study of the statistics of primordial fluctuations from consistency with unitarity, locality and …

A bstract We study some aspects of the de Sitter version of Jackiw-Teitelboim gravity.
Though we do not have propagating gravitons, we have a boundary mode when we …

A bstract We obtain solutions of the Wheeler-DeWitt equation with positive cosmological
constant for a closed universe in the large-volume limit. We argue that this space of solutions …

A bstract In this paper we discuss quantum computational restrictions on the types of thought
experiments recently used by Almheiri, Marolf, Polchinski, and Sully to argue against the …

A bstract We study aspects of Jackiw-Teitelboim (JT) quantum gravity in two-dimensional
nearly de Sitter (dS) spacetime, as well as pure de Sitter quantum gravity in three …

We propose a new duality relation between codimension-two space-like surfaces in
gravitational theories and quantum states in dual Hilbert spaces. This surface state …

We give an introductory review of gauge/gravity duality, and associated ideas of holography,
emphasising the conceptual aspects. The opening sections gather the ingredients, viz. anti …

We explore the construction and stability of asymptotically anti-de Sitter Euclidean
wormholes in a variety of models. In simple ad hoc low-energy models, it is not hard to …

A bstract We study the natural norm on the space of solutions to the Wheeler-DeWitt
equation in an asymptotically de Sitter spacetime. We propose that the norm is obtained by …