Stefan Eccles
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View article: Erratum to: Crossed products and quantum reference frames: on the observer-dependence of gravitational entropy
Erratum to: Crossed products and quantum reference frames: on the observer-dependence of gravitational entropy Open
A correction to this paper has been published: https://doi.org/10.1007/JHEP07(2025)063
View article: Gravitational entropy is observer-dependent
Gravitational entropy is observer-dependent Open
A bstract In quantum gravity, it has been argued that a proper accounting of the role played by an observer promotes the von Neumann algebra of observables in a given spacetime subregion from Type III to Type II. While this allows for a ma…
View article: Crossed products and quantum reference frames: on the observer-dependence of gravitational entropy
Crossed products and quantum reference frames: on the observer-dependence of gravitational entropy Open
A bstract A significant step towards a rigorous understanding of perturbative gravitational entropy was recently achieved by a series of works showing that a proper accounting of gauge invariance and observer degrees of freedom converts th…
View article: Linearization (in)stabilities and crossed products
Linearization (in)stabilities and crossed products Open
A bstract Modular crossed product algebras have recently assumed an important role in perturbative quantum gravity as they lead to an intrinsic regularization of entanglement entropies by introducing quantum reference frames (QRFs) in plac…
View article: Linearization (in)stabilities and crossed products
Linearization (in)stabilities and crossed products Open
A bstract Modular crossed product algebras have recently assumed an important role in perturbative quantum gravity as they lead to an intrinsic regularization of entanglement entropies by introducing quantum reference frames (QRFs) in plac…
View article: Why ETH? On thermalization and locality
Why ETH? On thermalization and locality Open
The eigenstate thermalization hypothesis (ETH) is foundational to modern discussions of thermalization in closed quantum systems. In this work, we expand on traditional explanations for the prevalence of ETH by emphasizing the role of oper…
View article: Edge modes as dynamical frames: charges from post-selection in generally covariant theories
Edge modes as dynamical frames: charges from post-selection in generally covariant theories Open
We develop a framework based on the covariant phase space formalism that identifies gravitational edge modes as dynamical reference frames. As such, they enable both the identification of the associated spacetime region and the imposition …
View article: Generic ETH: Eigenstate Thermalization beyond the Microcanonical
Generic ETH: Eigenstate Thermalization beyond the Microcanonical Open
The Eigenstate Thermalization Hypothesis (ETH) has played a key role in recent advances in the high energy and condensed matter communities. It explains how an isolated quantum system in a far-from-equilibrium initial state can evolve to a…
View article: Edge modes as dynamical frames: charges from post-selection in generally covariant theories
Edge modes as dynamical frames: charges from post-selection in generally covariant theories Open
We develop a framework based on the covariant phase space formalism that identifies gravitational edge modes as dynamical reference frames. They enable the identification of the associated spacetime region and the imposition of boundary co…
View article: Holographic complexity : bulk tests and implications
Holographic complexity : bulk tests and implications Open
This dissertation consists of four chapters. The first broadly and briefly orients the reader through an introduction to holographic complexity within the AdS/CFT correspondence. The next three chapters correspond to distinct lines of rese…
View article: Speed of quantum information spreading in chaotic systems
Speed of quantum information spreading in chaotic systems Open
In this work, we present a general theory of quantum information propagation in chaotic quantum many-body systems. The generic expectation in such systems is that quantum information does not propagate in localized form; instead, it tends …
View article: Holographic purification complexity
Holographic purification complexity Open
We study holographic subregion complexity, and its possible connection to purification complexity suggested recently by Ag\'on et al. In particular, we study the conjecture that subregion complexity is the purification complexity by consid…
View article: Holographic complexity and volume
Holographic complexity and volume Open
A bstract The previously proposed “Complexity=Volume” or CV-duality is probed and developed in several directions. We show that the apparent lack of universality for large and small black holes is removed if the volume is measured in units…
View article: Vector field instability and the primordial tensor spectrum
Vector field instability and the primordial tensor spectrum Open
It has recently been shown that the presence of a spectator pseudoscalar field, coupled to photons through a Chern-Simons term, can amplify the primordial tensor spectrum without observationally disrupting the primordial scalar spectrum. T…