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Boundary conformal field theory at the extraordinary transition: The layer susceptibility to O(ε)

  • Regular Article - Theoretical Physics
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  • Published: 12 January 2021
  • volume 2021, Article number: 55 (2021)
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Boundary conformal field theory at the extraordinary transition: The layer susceptibility to O(ε)
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  • M. A. Shpot  ORCID: orcid.org/0000-0001-9098-97451 

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A preprint version of the article is available at arXiv.

Abstract

We present an analytic calculation of the layer (parallel) susceptibility at the extraordinary transition in a semi-infinite system with a flat boundary. Using the method of integral transforms put forward by McAvity and Osborn [Nucl. Phys. B 455 (1995) 522] in the boundary CFT, we derive the coordinate-space representation of the mean-field propagator at the transition point. The simple algebraic structure of this function provides a practical possibility of higher-order calculations. Thus we calculate the explicit expression for the layer susceptibility at the extraordinary transition in the one-loop approximation. Our result is correct up to order O(ε) of the ε = 4 − d expansion and holds for arbitrary width of the layer and its position in the half-space. We discuss the general structure of our result and consider the limiting cases related to the boundary operator expansion and (bulk) operator product expansion. We compare our findings with previously known results and less complicated formulas in the case of the ordinary transition. We believe that analytic results for layer susceptibilities could be a good starting point for efficient calculations of two-point correlation functions. This possibility would be of great importance given the recent breakthrough in bulk and boundary conformal field theories in general dimensions.

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    M. A. Shpot

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Shpot, M.A. Boundary conformal field theory at the extraordinary transition: The layer susceptibility to O(ε). J. High Energ. Phys. 2021, 55 (2021). https://doi.org/10.1007/JHEP01(2021)055

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  • Received: 19 May 2020

  • Revised: 25 September 2020

  • Accepted: 19 November 2020

  • Published: 12 January 2021

  • DOI: https://doi.org/10.1007/JHEP01(2021)055

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Keywords

  • Boundary Quantum Field Theory
  • Conformal Field Theory
  • Field Theories in Higher Dimensions
  • Renormalization Group
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