14 citations · 15 across the 9 of their papers we have counts for
12 papers · 1 filter
Toward a Unique Filter for the Gravitational Path Integral
Marc S. Klinger
In recent work, McNamara and Wang demonstrated that the failure of factorization for a gravitational path integral (GPI) can be understood as an incompleteness of its spectrum of s…
How to have your wormholes and factorize, too
Marc S. Klinger
We review three well known inconsistencies in the standard mathematical formulation of semiclassical gravity: the factorization problem, the information problem, and the closed uni…
A Theory of Backgrounds and Background Independence
Marc Klinger
In this note, we describe how the study of backgrounds for general quantum systems can be formulated in terms of the representation theory of abstract algebras. We illustrate…
Generalized Entropy is von Neumann Entropy II: The complete symmetry group and edge modes
Marc S. Klinger, Jonah Kudler-Flam, Gautam Satishchandran
We consider the algebra of observables of perturbative quantum gravity in the exterior of a stationary black hole or the static patch of de Sitter spacetime. It was previously argu…
The Many Faces of Non-invertible Symmetries
Shadi Ali Ahmad, Marc S. Klinger, Yifan Wang
We investigate the interplay between algebraic and categorical notions of non-invertible symmetries. In particular, a fusion categorical symmetry is shown to induce a…
The Problem of Time and its Quantum Resolution
Marc S. Klinger, Robert G. Leigh
In this essay, we argue that the problem of time should not be regarded as an issue to be resolved within the prevailing framework for studying quantum gravity, but rather as an in…