Thomas Helfer, King's College, London

"Oscillotons and Axion Stars"

Abstract: I will talk about the GW signatures from the collisions of Oscillatons -- which are long-lived non-topological solutions of massive scalar fields. I will describe the technical challenges and present the GW wave forms of such collisions calculated using the numerical relativity code GRCHOMBO. I will show that for black hole end states, the total gravitational waves energy released in such collisions is more than that of BH-BH collisions of equal masses by a significant amount. I will also talk about how Oscillotons behave if they are made of a axion field instead of a scalar field.