648 citations · 7.5k across the 123 of their papers we have counts for
99 papers · 1 filter
A Lindbladian for exact renormalization of density operators in QFT
Samuel Goldman, Nima Lashkari, Robert G. Leigh
In arXiv:1609.03493, the authors extended the exact renormalization group (ERG) to arbitrary wave-functionals in quantum field theory (QFT). Applying this formalism, we show that t…
Null Raychaudhuri: Canonical Structure and the Dressing Time
Luca Ciambelli, Laurent Freidel, Robert G. Leigh
We initiate a study of gravity focusing on generic null hypersurfaces, non-perturbatively in the Newton coupling. We present an off-shell account of the extended phase space of the…
Crossed Products, Extended Phase Spaces and the Resolution of Entanglement Singularities
Marc S. Klinger, Robert G. Leigh
We identify a direct correspondence between the crossed product construction which plays a crucial role in the theory of Type III von Neumann algebras, and the extended phase space…
On the Inevitable Lightness of Vacuum
Laurent Freidel, Jerzy Kowalski-Glikman, Robert G. Leigh +1
In this essay, we present a new understanding of the cosmological constant problem, built upon the realization that the vacuum energy density can be expressed in terms of a phase s…
Extended Phase Space in General Gauge Theories
Marc S. Klinger, Robert G. Leigh, Pin-Chun Pai
In a recent paper, it was shown that in diffeomorphism-invariant theories, Noether charges associated with a given codimension-2 surface become integrable if one introduces an exte…
BRST Cohomology is Lie Algebroid Cohomology
Weizhen Jia, Marc S. Klinger, Robert G. Leigh
In this paper we demonstrate that the exterior algebra of an Atiyah Lie algebroid generalizes the familiar notions of the physicist's BRST complex. To reach this conclusion, we dev…
Exact Renormalization of Wave Functionals yields Continuous MERA
Samuel Goldman, Nima Lashkari, Robert G. Leigh +1
The exact renormalization group (ERG) is a powerful tool for understanding the formal properties of field theories. By adapting generalized ERG schemes to the flow of wavefunctiona…
Weyl-Ambient Geometries
Weizhen Jia, Manthos Karydas, Robert G. Leigh
Weyl geometry is a natural extension of conformal geometry with Weyl covariance mediated by a Weyl connection. We generalize the Fefferman-Graham (FG) ambient construction for conf…
The Vacuum Energy Density and Gravitational Entropy
Laurent Freidel, Jerzy Kowalski-Glikman, Robert G. Leigh +1
The failure to calculate the vacuum energy is a central problem in theoretical physics. Presumably the problem arises from the insistent use of effective field theory reasoning in…
Universal Corner Symmetry and the Orbit Method for Gravity
Luca Ciambelli, Robert G. Leigh
A universal symmetry algebra organizing the gravitational phase space has been recently found. It corresponds to the subset of diffeomorphisms that become physical at corners -- co…
Infrared Properties of Quantum Gravity: UV/IR Mixing, Gravitizing the Quantum -- Theory and Observation
Per Berglund, Laurent Freidel, Tristan Hubsch +4
We discuss the possible appearance of several rather exotic phenomena in quantum gravity, including UV/IR mixing, novel modifications of infrared phenomenology that extend effectiv…
Embeddings and Integrable Charges for Extended Corner Symmetry
Luca Ciambelli, Robert G. Leigh, Pin-Chun Pai
We revisit the problem of extending the phase space of diffeomorphism-invariant theories to account for embeddings associated with the boundary of sub-regions. We do so by emphasiz…
Isolated Surfaces and Symmetries of Gravity
Luca Ciambelli, Robert G. Leigh
Conserved charges in theories with gauge symmetries are supported on codimension-2 surfaces in the bulk spacetime. It has recently been suggested that various classical formulation…
Lie Algebroids and the Geometry of Off-shell BRST
Luca Ciambelli, Robert G. Leigh
It is well-known that principal bundles and associated bundles underlie the geometric structure of classical gauge field theories. In this paper, we explore the reformulation of ga…
Complexity for link complement States in Chern Simons Theory
Robert G. Leigh, Pin-Chun Pai
We study notions of complexity for link complement states in Chern Simons theory with compact gauge group . Such states are obtained by the Euclidean path integral on the comple…
Aspects of Holography of Taub-NUT-AdS4
Georgios Kalamakis, Robert G. Leigh, Anastasios C. Petkou
In this paper we consider aspects of the holographic interpretation of Taub-NUT-AdS. We review our earlier results which show that TNAdS gives rise to a holographic three-d…
Interfaces and the extended Hilbert space of Chern-Simons theory
Jackson R. Fliss, Robert G. Leigh
The low energy effective field theories of dimensional topological phases of matter provide powerful avenues for investigating entanglement in their ground states. In \cite…
Carroll Structures, Null Geometry and Conformal Isometries
Luca Ciambelli, Robert G. Leigh, Charles Marteau +1
We study the concept of Carrollian spacetime starting from its underlying fiber-bundle structure. The latter admits an Ehresmann connection, which enables a natural separation of t…
Weyl Connections and their Role in Holography
Luca Ciambelli, Robert G. Leigh
It is a well-known property of holographic theories that diffeomorphism invariance in the bulk space-time implies Weyl invariance of the dual holographic field theory in the sense…
The Theory of Metaparticles
Laurent Freidel, Jerzy Kowalski-Glikman, Robert G. Leigh +1
We introduce and develop the theory of metaparticles. At the classical level, this is a world-line theory with the usual reparameterization invariance and two additional features.…
Entanglement Entropy and the Colored Jones Polynomial
Vijay Balasubramanian, Matthew DeCross, Jackson Fliss +3
We study the multi-party entanglement structure of states in Chern-Simons theory created by performing the path integral on 3-manifolds with linked torus boundaries, called link co…
On the Non-commutativity of Closed String Zero Modes
Laurent Freidel, Robert G. Leigh, Djordje Minic
We explore several consequences of the recently discovered intrinsic non-commutativity of the zero-mode sector of closed string theory. In particular, we illuminate the relation be…
Intrinsic non-commutativity of closed string theory
Laurent Freidel, Robert G. Leigh, Djordje Minic
We show that the proper interpretation of the cocycle operators appearing in the physical vertex operators of compactified strings is that the closed string target is non-commutati…
Multi-Boundary Entanglement in Chern-Simons Theory and Link Invariants
Vijay Balasubramanian, Jackson R. Fliss, Robert G. Leigh +1
We consider Chern-Simons theory for gauge group at level on 3-manifolds with boundary consisting of topologically linked tori. The Euclidean path integral on $M_n…