3 papers
hep-th2026
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…
hep-th2025
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…
hep-th2024
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…