Little string theories (LSTs ) are non-local six dimensional (6D) theories that arise as a particular limit in string theory where gravity decouples, and they provide the ultraviolet (UV) completion for 6D effective local quantum field theories. The authors classify all such LSTs and show that they can be obtained as mild extensions of 6D superconformal field theories.
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Bhardwaj et al. (2016) studied this question.
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