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