N = 4 superconformal bootstrap of the K[subscript 3] CFT
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Author(s)
Simmons-Duffin, David
Yin, Xi
Lin, YingHsuan
Shao, Shu-Heng
Wang, Yifan
Date Issued
May 2017
Journal
Journal of High Energy Physics
Publisher
Springer Berlin Heidelberg
Citation
Lin, Ying-Hsuan et al. "N = 4 superconformal bootstrap of the K[subscript 3] CFT." Journal of High Energy Physics 2017 (May 2017): 126-176 © 2017 The Authors
Version
Final published version
Abstract
We study two-dimensional (4, 4) superconformal field theories of central charge c = 6, corresponding to nonlinear sigma models on K[subscript 3] surfaces, using the superconformal bootstrap. This is made possible through a surprising relation between the BPS N = 4 superconformal blocks with c = 6 and bosonic Virasoro conformal blocks with c = 28, and an exact result on the moduli dependence of a certain integrated BPS 4-point function. Nontrivial bounds on the non-BPS spectrum in the K[subscript 3] CFT are obtained as functions of the CFT moduli, that interpolate between the free orbifold points and singular CFT points. We observe directly from the CFT perspective the signature of a continuous spectrum above a gap at the singular moduli, and find numerically an upper bound on this gap that is saturated by the A[subscript 1]N = 4 cigar CFT. We also derive an analytic upper bound on the first nonzero eigenvalue of the scalar Laplacian on K3 in the large volume regime, that depends on the K3 moduli data. As two byproducts, we find an exact equivalence between a class of BPS N = 2 superconformal blocks and Virasoro conformal blocks in two dimensions, and an upper bound on the four-point functions of operators of sufficiently low scaling dimension in three and four dimensional CFTs.
MIT Department
Massachusetts Institute of Technology. Department of Mathematics
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1007/JHEP05(2017)126
