This article reviews the present status of the spin-foam approach to the quantization of
gravity. Special attention is payed to the pedagogical presentation of the recently-introduced …

A bstract In this note we study the 1+ 1 dimensional Jackiw-Teitelboim gravity in Lorentzian
signature, explicitly constructing the gauge-invariant classical phase space and the quantum …

BF gravity comprises all the formulations of gravity that are based on deformations of BF
theory. Such deformations consist of either constraints or potential terms added to the …

A bstract We propose an exact quantization of two-dimensional Jackiw-Teitelboim (JT)
gravity by formulating the JT gravity theory as a 2D gauge theory placed in the presence of a …

JT gravity has a first-order formulation as a two-dimensional BF theory, which can be viewed
as the dimensional reduction of the Chern-Simons description of $3 d $ gravity. We consider …

A bstract Quantum extremal surfaces (QES), codimension-2 spacelike regions which
extremize the generalized entropy of a gravity-matter system, play a key role in the study of …

A bstract We investigate structural aspects of JT gravity through its BF description. In
particular, we provide evidence that JT gravity should be thought of as (a coset of) the …

A bstract We discuss JT gravity in AdS and dS space in the second order formalism. For the
pure dS JT theory without matter, we show that the path integral gives rise in general to the …

A bstract A longstanding enigma within AdS/CFT concerns the entanglement entropy of
holographic quantum fields in Rindler space. The vacuum of a quantum field in Minkowski …

A bstract We discuss the canonical quantisation of JT gravity in de Sitter space, following
earlier work by Henneaux, with particular attention to the problem of time. Choosing the …