Work

Constraining boundary conditions in nonrational CFTs

Year: 2026

Type: article

Abstract: We revisit the question of conformal boundary conditions in the compact free boson CFT in two dimensions. Besides the well-known Neumann and Dirichlet cases, there is an additional proposed one-parameter family of boundary states when the radius is an irrational multiple of the self-dual radius. These additional states have a continuous open string spectrum, and we give an explicit formula for the density of states. We also discuss several pathologies of these states, including the possible violation of the cluster condition, and that they have a divergent g function.

Source: Physical review. D/Physical review. D.

DOI: 10.1103/44rr-dz2y

Authors: Yucong Cai, Daniel Robbins, Hassaan Saleem

Institution: University at Albany, State University of New York

Language: English

Topic: Black Holes and Theoretical Physics

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

OpenAlex ID: W4417226596

FWCI:

Cites:

Cited by:

Related to: