Modular Hamiltonian for de Sitter diamonds

MB Fröb - Journal of High Energy Physics, 2023 - Springer
A bstract We determine the Tomita-Takesaki modular data for CFTs in double cone and light
cone regions in conformally flat spacetimes. This includes in particular the modular …

Relative entropy in de Sitter spacetime is a Noether charge

MB Fröb, A Much, K Papadopoulos - Physical Review D, 2023 - APS
We compute the relative entropy between the vacuum and a coherent state for a massive
scalar field in de Sitter spacetime, using Tomita-Takesaki modular theory and the Araki …

[HTML][HTML] From local nets to Euler elements

V Morinelli, KH Neeb - Advances in Mathematics, 2024 - Elsevier
Various aspects of the geometric setting of Algebraic Quantum Field Theory (AQFT) models
related to representations of the Poincaré group can be studied for general Lie groups …

Nets of standard subspaces on non-compactly causal symmetric spaces

J Frahm, KH Neeb, G Olafsson - arxiv preprint arxiv:2303.10065, 2023 - arxiv.org
Let G be a connected simple linear Lie group and H in G a symmetric subgroup such that the
corresponding symmetric space G/H is non-compactly causal. We show that any irreducible …

Wedge domains in compactly causal symmetric spaces

KH Neeb, G Ólafsson - International Mathematics Research …, 2023 - academic.oup.com
Motivated by constructions in Algebraic Quantum Field Theory we introduce wedge domains
in compactly causal symmetric spaces, which includes in particular anti-de Sitter space in all …

Relative Entropy of Fermion Excitation States on the CAR Algebra

S Galanda, A Much, R Verch - Mathematical Physics, Analysis and …, 2023 - Springer
The relative entropy of certain states on the algebra of canonical anticommutation relations
(CAR) is studied in the present work. The CAR algebra is used to describe fermionic …

Modular structure of the Weyl algebra

R Longo - Communications in Mathematical Physics, 2022 - Springer
We study the modular Hamiltonian associated with a Gaussian state on the Weyl algebra.
We obtain necessary/sufficient criteria for the local equivalence of Gaussian states …

Entropy-area law and temperature of de Sitter horizons from modular theory

E D'Angelo, MB Fröb, S Galanda… - … of Theoretical and …, 2024 - academic.oup.com
We derive an entropy-area law for the future horizon of an observer in diamonds inside a
static patch of de Sitter space-time, taking into account the back reaction of quantum matter …

Wedge domains in non-compactly causal symmetric spaces

KH Neeb, G Ólafsson - Geometriae Dedicata, 2023 - Springer
This article is part of an ongoing project aiming at the connections between causal structures
on homogeneous spaces, Algebraic Quantum Field Theory, modular theory of operator …

Bayesian inversion and the Tomita–Takesaki modular group

L Giorgetti, AJ Parzygnat, A Ranallo… - The Quarterly Journal …, 2023 - academic.oup.com
We show that conditional expectations, optimal hypotheses, disintegrations and adjoints of
unital completely positive maps are all instances of Bayesian inverses. We study the …