Résume | Kudla and Rallis inititaed the subject of the regularized Siegel-Weil formula for its application to the Rallis inner product formula. The purpose of the regularized Siegel-Weil formula is to relate a regularized theta integral to a Siegel-Eisenstein series. For symplectic groups, they proved an identity (called the first term identity) between the leading terms of the Laurent expansion of the two sides, and this was subsequently extended to other classical groups by others. Such a first term identtiy is sufficient for the Rallis inner product formula in certain situations. In this talk, we discussed joint work with Yannan Qiu and Shuichiro Takeda in which we proved the general second term identity which relates the next terms in the Laurent expansion. This second term identity is necessary to establish the Rallis inner product formula in the remaining situations. |