Exact WKB methods in SU(2) Nf = 1

Alba Grassi (Section de Mathématiques, Université de Genève, Genève 4, 1211, Switzerland; Theoretical Physics Department, CERN, Geneva 23, 1211, Switzerland) ; Qianyu Hao (Department of Physics, University of Texas at Austin, 2515 Speedway, C1600, Austin, TX, 78712-1992, USA) ; Andrew Neitzke (Department of Mathematics, Yale University, P.O. Box 208283, New Haven, CT, 06520-8283, USA)

We study in detail the Schrödinger equation corresponding to the four dimensional SU(2) N $$ \mathcal{N} $$ = 2 SQCD theory with one flavour. We calculate the Voros symbols, or quantum periods, in four different ways: Borel summation of the WKB series, direct computation of Wronskians of exponentially decaying solutions, the TBA equations of Gaiotto-Moore-Neitzke/Gaiotto, and instanton counting. We make computations by all of these methods, finding good agreement. We also study the exact quantization condition for the spectrum, and we compute the Fredholm determinant of the inverse of the Schrödinger operator using the TS/ST correspondence and Zamolodchikov’s TBA, again finding good agreement. In addition, we explore two aspects of the relationship between singularities of the Borel transformed WKB series and BPS states: BPS states of the 4d theory are related to singularities in the Borel transformed WKB series for the quantum periods, and BPS states of a coupled 2d+4d system are related to singularities in the Borel transformed WKB series for local solutions of the Schrödinger equation.

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      "source": "Springer", 
      "value": "We study in detail the Schr\u00f6dinger equation corresponding to the four dimensional SU(2)   <math> <mi>N</mi> </math>  $$ \\mathcal{N} $$  = 2 SQCD theory with one flavour. We calculate the Voros symbols, or quantum periods, in four different ways: Borel summation of the WKB series, direct computation of Wronskians of exponentially decaying solutions, the TBA equations of Gaiotto-Moore-Neitzke/Gaiotto, and instanton counting. We make computations by all of these methods, finding good agreement. We also study the exact quantization condition for the spectrum, and we compute the Fredholm determinant of the inverse of the Schr\u00f6dinger operator using the TS/ST correspondence and Zamolodchikov\u2019s TBA, again finding good agreement. In addition, we explore two aspects of the relationship between singularities of the Borel transformed WKB series and BPS states: BPS states of the 4d theory are related to singularities in the Borel transformed WKB series for the quantum periods, and BPS states of a coupled 2d+4d system are related to singularities in the Borel transformed WKB series for local solutions of the Schr\u00f6dinger equation."
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Published on:
11 January 2022
Publisher:
Springer
Published in:
Journal of High Energy Physics , Volume 2022 (2022)
Issue 1
Pages 1-63
DOI:
https://doi.org/10.1007/JHEP01(2022)046
arXiv:
2105.03777
Copyrights:
The Author(s)
Licence:
CC-BY-4.0

Fulltext files: