153 citations · 908 across the 28 of their papers we have counts for
30 papers
Quantum Fluctuations and Newton-Cartan Geometry for Non-Relativistic de Sitter space
Matthias Harksen, Diego Hidalgo, Watse Sybesma
We study a non-relativistic realisation of two-dimensional de Sitter gravity both from its boundary and bulk description with the goal of learning about de Sitter space and paving…
New Rotating Black Holes in String Theory
Watse Sybesma, Poula Tadros
We present new black hole solutions to the low-energy effective action of string theory. We introduce three- and four-dimensional solutions that are rotating, asymptotically flat,…
Emergence of Krylov complexity through quantum walks: An exploration of the quantum origins of complexity
Dimitrios Patramanis, Watse Sybesma
In this work we study the relationship between quantum random walks on graphs and Krylov/spread complexity. We show that the latter's definition naturally emerges through a canonic…
Limits on the Statistical Description of Charged de Sitter Black Holes
Lars Aalsma, Puxin Lin, Jan Pieter van der Schaar +2
The thermodynamics of de Sitter black holes is complicated by the presence of two horizons and the absence of a globally defined timelike Killing vector. The standard choice of the…
De Sitter Complexity Grows Linearly in the Static Patch
Vyshnav Mohan, Watse Sybesma
The observable universe has undergone periods of expansion that are well approximated by de Sitter (dS) space. Still lacking is a quantum mechanical description of dS, both globall…
Quantum corrections to the path integral of near extremal de Sitter black holes
Matthew J. Blacker, Alejandra Castro, Watse Sybesma +1
We study quantum corrections to the Euclidean path integral of charged and static four-dimensional de Sitter (dS) black holes near extremality. These black holes admit three di…
The spectrum of a quantum Lifshitz black hole in two dimensions
Matthias Harksen, Watse Sybesma
We examine the low-energy spectrum of a four-dimensional near-extremal black hole that arises as a solution to a low energy effective theory of heterotic string theory. The effecti…
Liouville gravity at the end of the world: Deformed defects in AdS/BCFT
Dominik Neuenfeld, Andrew Svesko, Watse Sybesma
We study shape deformations of two-dimensional end-of-the-world (ETW) branes, such as those in bottom-up models of two-dimensional holographic boundary conformal field theories (BC…
Carroll Strings with an Extended Symmetry Algebra
Matthias Harksen, Diego Hidalgo, Watse Sybesma +1
Starting from the Polyakov action we consider two distinct Carroll limits in target space, keeping the string worldsheet relativistic. The resulting magnetic and chiral Carroll str…
Carroll stories
Jan de Boer, Jelle Hartong, Niels A. Obers +2
We study various aspects of the Carroll limit in which the speed of light is sent to zero. A large part of this paper is devoted to the quantization of Carroll field theories. We s…
Krylov complexity in a natural basis for the Schrödinger algebra
Dimitrios Patramanis, Watse Sybesma
We investigate operator growth in quantum systems with two-dimensional Schrödinger group symmetry by studying the Krylov complexity. While feasible for semisimple Lie algebras, cas…
A Zoo of Deformed Jackiw-Teitelboim Models near Large Dimensional Black Holes
Watse Sybesma
We consider a charged Lifshitz black hole in the large transverse dimension limit. In this setup, the dynamics near the black hole horizon are shown to be effectively governed by a…
An Outsider's Perspective on Information Recovery in de Sitter Space
Lars Aalsma, Sergio E. Aguilar-Gutierrez, Watse Sybesma
Entanglement islands play a crucial role in our understanding of how Hawking radiation encodes information in a black hole, but their relevance in cosmological spacetimes is less c…
Conformal Carroll Scalars with Boosts
Stefano Baiguera, Gerben Oling, Watse Sybesma +1
We construct two distinct actions for scalar fields that are invariant under local Carroll boosts and Weyl transformations. Conformal Carroll field theories were recently argued to…
Microcanonical Action and the Entropy of Hawking Radiation
Juan F. Pedraza, Andrew Svesko, Watse Sybesma +1
The island formula -- an extremization prescription for generalized entropy -- is known to result in a unitary Page curve for the entropy of Hawking radiation. This semi-classical…
Carroll symmetry, dark energy and inflation
Jan de Boer, Jelle Hartong, Niels A. Obers +2
Carroll symmetry arises from Poincaré symmetry upon taking the limit of vanishing speed of light. We determine the constraints on the energy-momentum tensor implied by Carroll symm…
Semi-classical thermodynamics of quantum extremal surfaces in Jackiw-Teitelboim gravity
Juan F. Pedraza, Andrew Svesko, Watse Sybesma +1
Quantum extremal surfaces (QES), codimension-2 spacelike regions which extremize the generalized entropy of a gravity-matter system, play a key role in the study of the black hole…
The Price of Curiosity: Information Recovery in de Sitter Space
Lars Aalsma, Watse Sybesma
Recent works have revealed that quantum extremal islands can contribute to the fine-grained entropy of black hole radiation reproducing the unitary Page curve. In this paper, we us…
Pure de Sitter space and the island moving back in time
Watse Sybesma
Observers in de Sitter space can only access the space up to their cosmological horizon. Assuming thermal equilibrium, we use the quantum Ryu-Takayanagi or island formula to comput…
Page Curve for an Evaporating Black Hole
Friðrik Freyr Gautason, Lukas Schneiderbauer, Watse Sybesma +1
A Page curve for an evaporating black hole in asymptotically flat spacetime is computed by adapting the Quantum Ryu-Takayanagi (QRT) proposal to an analytically solvable semi-class…
Non-Boost Invariant Fluid Dynamics
Jan de Boer, Jelle Hartong, Emil Have +2
We consider uncharged fluids without any boost symmetry on an arbitrary curved background and classify all allowed transport coefficients up to first order in derivatives. We assum…
Action Complexity for Semi-Classical Black Holes
Lukas Schneiderbauer, Watse Sybesma, Lárus Thorlacius
We adapt the complexity as action prescription (CA) to a semi-classical model of two-dimensional dilaton gravity and determine the rate of increase of holographic complexity for an…
First order non-Lorentzian fluids, entropy production and linear instabilities
Napat Poovuttikul, Watse Sybesma
In this note, we investigate linear instabilities of hydrodynamics with corrections up to first order in derivatives. It has long been known that relativistic (Lorentzian) first or…
Holographic Complexity: Stretching the Horizon of an Evaporating Black Hole
Lukas Schneiderbauer, Watse Sybesma, Lárus Thorlacius
We obtain the holographic complexity of an evaporating black hole in the semi-classical RST model of two-dimensional dilaton gravity, using a volume prescription that takes into ac…