Bosonic ghostbusting: the bosonic ghost vertex algebra admits a logarithmic module category with rigid fusion

Allen, Robert and Wood, Simon ORCID: https://orcid.org/0000-0002-8257-0378 2022. Bosonic ghostbusting: the bosonic ghost vertex algebra admits a logarithmic module category with rigid fusion. Communications in Mathematical Physics 390 , pp. 959-1015. 10.1007/s00220-021-04305-6

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Abstract

The rank 1 bosonic ghost vertex algebra, also known as the βγ ghosts, symplectic bosons or Weyl vertex algebra, is a simple example of a conformal field theory which is neither rational, nor C2-cofinite. We identify a module category, denoted category F, which satisfies three necessary conditions coming from conformal field theory considerations: closure under restricted duals, closure under fusion and closure under the action of the modular group on characters. We prove the second of these conditions, with the other two already being known. Further, we show that category F has sufficiently many projective and injective modules, give a classification of all indecomposable modules, show that fusion is rigid and compute all fusion products. The fusion product formulae turn out to perfectly match a previously proposed Verlinde formula, which was computed using a conjectured generalisation of the usual rational Verlinde formula, called the standard module formalism. The bosonic ghosts therefore exhibit essentially all of the rich structure of rational theories despite satisfying none of the standard rationality assumptions such as C2-cofiniteness, the vertex algebra being isomorphic to its restricted dual or having a one-dimensional conformal weight 0 space. In particular, to the best of the authors’ knowledge this is the first example of a proof of rigidity for a logarithmic non-C2-cofinite vertex algebra.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Mathematics
Additional Information:	This article is licensed under a Creative Commons Attribution 4.0 International License
Publisher:	Springer
ISSN:	0010-3616
Funders:	EPSRC
Date of First Compliant Deposit:	18 January 2022
Date of Acceptance:	27 December 2021
Last Modified:	17 May 2023 17:59
URI:	https://orca.cardiff.ac.uk/id/eprint/146765

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