Analysis of algebraic and geometrical structure in superstring theory

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In this project, the head investigator S. Uehara investigated the supermembrane theory which is one of the important fundamental excitations of M-theory. Uehara succeeded in giving the matrix representation of the affine Lie algebra which appears when supermembrane wraps on a circle. Uehara also gave the matrix representation of the wrapped supermembrane on 2-torus. Furthermore, Uehara succeeded in deriving the(p, q)-string action directly from the supermembrane action.S. Aoyama showed a new formula of the triplet Killing potentials of quatenionic Kaehler manifolds with the metric of the manifolds. Aoyama also investigated two-dimensional non-linear sigma-models on the Kaehler maniforld G/H in the first order formalism and constructed the G-symmetry currents and primaries by using the Berkovits method.T. Kawai discussed the geometry of D2-D0 branes may be related to Gromov-Witten theory of Calabi-Yau threefolds. Kawai also discussed the relation to Gopakumar-Vafa invariants.H. Awata investigated the connection of Nekrasov's partition function in the Omega background and the moduli space of D-branes and showed that the spin contents obtained by Nekrasov's formula are consistent with the Gopakumar-Vafa invariants on a local Hirzebruch surface. Awata also proposed the refined topological vertex in terms of the specialization of the Macdonald function.