Mr
James Edholm
(Lancaster University)
11/01/2018, 15:30
Infinite Derivative Gravity (IDG) provides a mechanism for resolving the singularity present in General Relativity as well as producing inflation. Here I will discuss how the weak-field limit can be made regular using IDG around both flat and curved backgrounds.
Mr
Thomas Helfer
(Kings College London)
11/01/2018, 15:50
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...
Ben Maybee
(University of Edinburgh)
11/01/2018, 16:10
The double copy is a direct duality between Yang-Mills theory and gravity that emerges from the modern scattering amplitudes programme. In this talk I will discuss how the double copy can be applied to the scattering of Reissner-Nordström black holes, deriving the classical perturbative result from charged scalar diagrams, and showing that a novel external axion mode also arises. Such...
Mr
Bogdan Ganchev
(University of Cambridge)
11/01/2018, 16:30
We present a numerical analysis of the stability properties of the black holes with scalar hair constructed by Herdeiro and Radu. We prove the existence of a novel gauge where the scalar field perturbations decouple from the metric perturbations, and analyse the resulting quasinormal mode spectrum. We find unstable modes with characteristic growth rates which for uniformly small hair are...
Mr
Josu C. Aurrekoetxea
(King's College London)
11/01/2018, 16:50
In this talk I will give a very brief introduction to the field of Numerical Relativity and how it can be applied to get full GR Cosmic String simulations.
