Conformal Perturbation Theory for Twisted Fields

Christoph A. Keller; Ida G. Zadeh

Conformal Perturbation Theory for Twisted Fields

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arxiv 1907.08207 v2 pith:6VWXU7EM submitted 2019-07-18 hep-th

Christoph A. Keller , Ida G. Zadeh This is my paper · ORCID

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keywords conformalordercoverevaluatefieldsintegralsmarginalmathbb

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abstract

We investigate second order conformal perturbation theory for $\mathbb{Z}_2$ orbifolds of conformal field theories in two dimensions. To evaluate the necessary twisted sector correlation functions and their integrals, we map them from the sphere to its torus double cover. We discuss how this relates crossing symmetry to the modular group, and introduce a regularization scheme on the cover that allows to evaluate the integrals numerically. These methods do not require supersymmetry. As an application, we show that in the torus orbifold of 8 and 16 free bosons, $\mathbb{Z}_2$ twist fields are marginal at first order, but stop being marginal at second order.

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Symmetric Product Orbifold Universality and the Mirage of an Emergent Spacetime
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Symmetric product orbifolds have large-N thermal correlators identical to BTZ, undercutting the claim that a type III1 von Neumann algebra implies a sharp emergent horizon.

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