4 papers
Threshold Corrections in Heterotic String Theory from Conformal Perturbation Theory
Dilan Nur Demirtaş, Christoph A. Keller, Manki Kim
We use conformal perturbation theory to compute one-loop threshold corrections to the Kähler potential of the heterotic string. For this we consider the theory compactified at the…
CFTs with Large Gap from Barnes-Wall Lattice Orbifolds
Christoph A. Keller, Ashley Winter Roberts, Jeremy Roberts
We investigate orbifolds of lattice conformal field theories with the goal of constructing theories with large gap. We consider Barnes-Wall lattices, which are a family of lattices…
Conformal Perturbation Theory on K3: The Quartic Gepner Point
Christoph A. Keller
The Gepner model (2)^4 describes the sigma model of the Fermat quartic K3 surface. Moving through the nearby moduli space using conformal perturbation theory, we investigate how th…
Sparse Modular Forms, Lattices, and Codes
Christoph A. Keller, Ashley Winter Roberts
Motivated by sparseness conditions for holographic CFTs, we investigate sparseness of modular forms, lattices, and codes. For this we investigate the free energy of such objects as…