# Absorptive Effects and Classical Black Hole Scattering

- Institution: CERN
- Department: Conferences, Workshops & Schools
- Speaker: Callum Jones
- Year: 2023
- Language: English
- Source: [CERN](https://videos.cern.ch/record/3001716)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

I will describe an approach to incorporating absorption effects into the post-Minkowskian effective description of two-body classical gravitational scattering. By coupling the usual point-particle effective description to an invisible sector of gapless internal degrees-of-freedom, the leading-order absorptive effects are encoded in the low-energy expansion of a spectral density function; for black holes this spectral function is obtained by matching an absorption cross-section calculated in black hole perturbation theory. This information is then recycled using the scattering amplitudes-based KMOC formalism to calculate the impulse on and change in rest mass of a Schwarzschild black hole scattering with a second compact body sourcing a massless scalar, electromagnetic or gravitational field. I will show that the results obtained are consistent with both worldline Schwinger-Keldysh calculations and numerical scalar self-force results..

0:00:00 Slide 1

0:02:23 Slide 2

0:04:40 Slide 3

0:06:55 Slide 4

0:09:37 Slide 5

0:10:59 Slide 6

0:13:02 Slide 7

0:14:43 Slide 8

0:17:03 Slide 9

0:18:50 Slide 10

0:20:26 Slide 11

0:22:33 Slide 12

0:23:58 Slide 13

0:25:21 Slide 14

0:27:05 Slide 15

0:28:57 Slide 16

## Lectures

1. [Absorptive Effects and Classical Black Hole Scattering](https://invisiblenetwork.ai/learn/cern/3001716/66649d59693f), 33 min (CERN's player)