English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We investigate second order conformal perturbation theory for $\mathbb{Z}_2$orbifolds of conformal field theories in two dimensions. To evaluate thenecessary twisted sector correlation functions and their integrals, we map themfrom the sphere to its torus double cover. We discuss how this relates crossingsymmetry to the modular group, and introduce a regularization scheme on thecover that allows to evaluate the integrals numerically. These methods do notrequire supersymmetry. As an application, we show that in the torus orbifold of8 and 16 free bosons, $\mathbb{Z}_2$ twist fields are marginal at first order,but stop being marginal at second order.

Conformal Perturbation Theory for Twisted Fields