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pro vyhledávání: '"Marolf, Donald"'
Autor:
Marolf, Donald
Spacetime wormholes in gravitational path integrals have long been interpreted in terms of ensembles of theories. Here we probe what sort of theories such ensembles might contain. Careful consideration of a simple $d=2$ topological model indicates th
Externí odkaz:
http://arxiv.org/abs/2407.04625
Spacetime wormholes can provide non-perturbative contributions to the gravitational path integral that make the actual number of states $e^S$ in a gravitational system much smaller than the number of states $e^{S_{\mathrm{p}}}$ predicted by perturbat
Externí odkaz:
http://arxiv.org/abs/2405.04571
Autor:
Marolf, Donald, Zhang, Daiming
Euclidean path integrals for UV-completions of $d$-dimensional bulk quantum gravity were studied in [1] by assuming that they satisfy axioms of finiteness, reality, continuity, reflection-positivity, and factorization. Sectors ${\cal H}_{\cal B}$ of
Externí odkaz:
http://arxiv.org/abs/2402.09691
Random tensor networks (RTNs) have proved to be fruitful tools for modelling the AdS/CFT correspondence. Due to their flat entanglement spectra, when discussing a given boundary region $R$ and its complement $\bar R$, standard RTNs are most analogous
Externí odkaz:
http://arxiv.org/abs/2401.02487
Consider two boundary subregions $A$ and $B$ that lie in a common boundary Cauchy surface, and consider also the associated HRT surface $\gamma_B$ for $B$. In that context, the constrained HRT surface $\gamma_{A:B}$ can be defined as the codimension-
Externí odkaz:
http://arxiv.org/abs/2311.18290
Due to the conformal factor problem, the definition of the Euclidean gravitational path integral requires a non-trivial choice of contour. The present work examines a generalization of a recently proposed rule-of-thumb \cite{Marolf:2022ntb} for selec
Externí odkaz:
http://arxiv.org/abs/2310.08555
Recent works by Chandrasekaran, Penington, and Witten have shown in various special contexts that the quantum-corrected Ryu-Takayanagi (RT) entropy (or its covariant Hubeny-Rangamani-Takayanagi (HRT) generalization) can be understood as computing an
Externí odkaz:
http://arxiv.org/abs/2310.02189
A trace inequality for Euclidean gravitational path integrals (and a new positive action conjecture)
The AdS/CFT correspondence states that certain conformal field theories are equivalent to string theories in a higher-dimensional anti-de Sitter space. One aspect of the correspondence is an equivalence of density matrices or, if one ignores normaliz
Externí odkaz:
http://arxiv.org/abs/2309.02497
Autor:
Marolf, Donald
Thermal partition functions for gravitational systems have traditionally been studied using Euclidean path integrals. But in Euclidean signature the gravitational action suffers from the conformal factor problem, which renders the action unbounded be
Externí odkaz:
http://arxiv.org/abs/2203.07421
The concept of fixed-area states has proven useful for recent studies of quantum gravity, especially in connection with gravitational holography. We explore the Lorentz-signature spacetime geometry intrinsic to such fixed-area states in this paper. T
Externí odkaz:
http://arxiv.org/abs/2203.04973