In theoretical physics, little string theory is a non-gravitational non-local theory in six spacetime dimensions that can be obtained as an effective theory of NS5-branes in the limit in which gravity decouples. Little string theories exhibit T-duality, much like the full string theory.
References
Aharony, Ofer (2000). "A brief review of "little string theories"". Quantum Grav. 17 (5). doi:10.1088/0264-9381/17/5/302.
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