Portal de Periódicos da CAPES

Modular invariance and two-loop bosonic string vacuum amplitude

1986; Elsevier BV; Volume: 179; Issue: 3 Linguagem: Inglês

10.1016/0370-2693(86)90573-3

1873-2445

Asuka Kato, Yutaka Matsuo, Satoru Odake,

Algebraic structures and combinatorial models

An explicit formula is obtained for the two-loop vacuum amplitude of the closed bosonic string in terms of a Siegel modular form (cusp form) of weight ten.