Université de GenèveDépartement de Physique ThéoriqueCAP Genève

Scattering of gravitational waves by compact objects and black holes

11. February 2022 - 11:30
Sam Dolan (University of Sheffield)
Abstract: In principle, a planar gravitational wave passing through a dense body is focussed at a cusp caustic. For the Sun, the cusp is approximately 550 astronomical units away; for a neutron star the cusp forms close to the crust. Conversely, a planar wave impinging on a black hole will be partially absorbed and scattered, and the black hole's light ring will create characteristic diffraction patterns (orbiting and glories). In this talk I will describe general features of scattering by compact objects, and over-dense regions of the universe. I will draw an analogy with time travel maps for tsunamis, in which the height of the sea bed plays the role of the gravitational potential.


Département de Physique Théorique
Université de Genève
24, quai Ernest Ansermet
1211 Genève 4
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