Name: Takashi Hiramatsu
 Institution: Yukawa Institute for Theoretical Physics, Kyoto University
 Title: Gravitational waves from Q-balls in gravity mediation
 Key Words: cosmology, Q-ball, gravitational waves
 Abstract: We study the gravitational waves generated during Q-ball formation in the expanding universe on 3D lattice simulations. We obtain detailed spectrum of the gravitational waves in the cases with circular orbit and also highly elliptic orbit of the initial Affleck-Dine field in the phase space. Together with detailed analysis of our previous numerical study on Q-ball formation, we discuss the shape of the gravitational wave spectra, and predict their amplitudes at the present time in some models.