6 papers
Target-space fusion of classical topological defects
Saskia Demulder, Chuying Wang
Classical fusion of sigma-model defects is commonly approached by combining their worldsheet actions and eliminating the intermediate fields. This procedure, however, does not syst…
Stringy T-duality on the lattice and the twisted Villain model
Coraline Bacq, Alessio Caddeo, Saskia Demulder +1
We address the question of whether dualities formulated in continuum field theory can be realised exactly at finite lattice spacing, rather than only emerging in the infrared. In t…
Non-invertible circuit complexity from fusion operations
Saskia Demulder
Modern understanding of symmetry in quantum field theory includes both invertible and non-invertible operations. Motivated by this, we extend Nielsen's geometric approach to quantu…
Non-invertible Nielsen circuits and 3d Ising gravity
Saskia Demulder
We extend Nielsen's formulation of quantum circuit complexity to include intrinsically non-invertible operations. Such gates arise from fusion with topological defect operators and…
On topological defects in Chern-Simons theory
Alex S. Arvanitakis, Lewis T. Cole, Saskia Demulder +1
We construct a new class of topological surface defects in Chern-Simons theory with non-compact, non-Abelian gauge groups. These defects are characterized by isotropic subalgebras…
Navigating string theory field space with geometric flows
Saskia Demulder, Dieter Lust, Thomas Raml
The Swampland Distance Conjecture postulates the emergence of an infinite tower of massless states when approaching infinite-distance points in moduli space. However, most string b…