Speaker
Sota Nakajima
(Osaka City U)
Description
The target space duality of string theory without spacetime supersymmetry, which is constructed by splitting the Narain lattice by a shift-vector with order 2, is investigated. We show that the duality symmetry of such a model is obtained by imposing a congruence condition on $O\left(d_{L},d_{R},\mathbb{Z}\right) $, that is, the non-supersymmetric string model is invariant under a congruence subgroup of $O\left(d_{L},d_{R},\mathbb{Z}\right)$.
