Title: Observational Predictions of Generalized Galilean Genesis

Abstract: Inflation is a very successful scenario for the early universe. However, even an inflationary universe has a singularity in the past, and the alternative scenarios motivated by this problem have been discussed. In this talk, we focus on one of the alternative scenarios called Galilean genesis. This scenario has the fascinating feature that the universe starts expanding from approximately Minkowski space-time. We discuss two aspects of primordial gravitational waves generated in the genesis phase. One is the gravitation and solution of GW’s during the genesis-reheating transformation and, after that, the radiation-dominated universe. The other is the possibility of the various spectrum of GW’s by extending the existing genesis models. The genesis models we discuss in this talk are described in the Horndeski theory, which is the generalized scalar-tensor theory having up to second derivative terms.