# Sitemap

A list of all the posts and pages found on the site. For you robots out there is an XML version available for digesting as well.

## pages

## posts

## Capra 25

** Published:**

This week I attended the 25th Capra Meeting on Radiation Reaction in General Relativity at University College Dublin which was my first in person conference in over two years! It emphasised how useful the small discussions can be and was very useful to talk to other people from my field in a such a way that had been impossible with the pandemic.

## Sagittarius A*

** Published:**

Five years, petabytes of data and many hours of computing time has gone into imaging the supermassive black hole at the centre of our own Milky Way galaxy. Congratulations to the Event Horizon Telescope Collaboration on this amazing feat!

## Viva voce

** Published:**

Today was a remarkable day. My PhD viva consisted of a 45 minute presentation on my thesis followed by the standard Q&A session. Profs Carlos Sopuerta and Oscar Campos-Dias were very diligent examiners and asked many thought provoking questions about everything from the history of self-force formulation right through to my future plans. To be truly honest it felt just like casually discussing research for a couple of hours rather than an examination. I actually enjoyed it! The best part of the day though was when I got to come back into the room and was told that I had passed with no corrections!

## portfolio

## publications

## Time-domain metric reconstruction for hyperbolic scattering Permalink

Published in *Physical Review D*, 2021

Citation: **O. Long** & L. Barack. Time-domain metric reconstruction for hyperbolic scattering. *Phys. Rev. D* **104**, 024014 (2021).

## Self-force in hyperbolic black hole encounters Permalink

Published in *ePrints, University of Southampton*, 2022

**PhD Thesis**

arXiv:2209.03836

Citation: **O. Long** (2022) Self-force in hyperbolic black hole encounters. *University of Southampton*, *Doctoral Thesis*, 139pp.

## Self-force correction to the deflection angle in black-hole scattering: a scalar charge toy model Permalink

Published in *Physical Review D*, 2022

Citation: L. Barack & **O. Long**. Self-force correction to the deflection angle in black-hole scattering: a scalar charge toy model. *Phys. Rev. D* **106**, 104031 (2022).

## Hyperboloidal discontinuous time-symmetric numerical algorithm with higher order jumps for gravitational self-force computations in the time domain Permalink

Published in *arXiv*, 2023

Accepted for publication in *Phys. Rev. D*.

arXiv:2306.13153

Citation: L. J. Gomes Da Silva, R. Panosso Macedo, J. E. Thompson, J. A. Valiente Kroon, *et al*. Hyperboloidal discontinuous time-symmetric numerical algorithm with higher order jumps for gravitational self-force computations in the time domain. *arXiv:2306.13153*.

## Comparison of post-Minkowskian and self-force expansions: Scattering in a scalar charge toy model Permalink

Published in *Physical Review D*, 2023

Citation: L. Barack, Z. Bern, E. Hermann, **O. Long**, *et al*. Comparison of post-Minkowskian and self-force expansions: Scattering in a scalar charge toy model. *Phys. Rev. D* **108**, 024025 (2023).

## Extending black-hole remnant surrogate models to extreme mass ratios Permalink

Published in *Physical Review D*, 2023

Citation: M. Boschini, D. Gerosa, V. Varma, *et al*. Extending black-hole remnant surrogate models to extreme mass ratios. *arXiv:2307.03435*.

## Waveform Modelling for the Laser Interferometer Space Antenna Permalink

Published in *arXiv*, 2023

Citation: N. Afshordi, *et al* (LISA Consortium Waveform Working Group). Waveform Modelling for the Laser Interferometer Space Antenna. *arXiv:2311.01300*.

## Black hole scattering near the transition to plunge: Self-force and resummation of post-Minkowskian theory Permalink

Published in *arXiv*, 2024

Citation: **O. Long**, C. Whittall & L. Barack. Black hole scattering near the transition to plunge: Self-force and resummation of post-Minkowskian theory. *arXiv:2406.08363*.

## talks

## Self-force in hyperbolic black hole encounters

** Published:**

Runner Up for the Best Student Talk Prize.

## Extraction of high-order post-Minkowskian results from scattering self-force calculations

** Published:**

Invited talk

## Comparison of post-Minkowskian and self-force expansions: Scattering in a scalar charge toy model

** Published:**

## Hyperbolic self-force calculations within a hyperboloidal framework

** Published:**

Invited talk

## Self-force meets post-Minkowskian in the scattering regime Permalink

** Published:**

Invited talk

## Double the hype: Hyperboloidal framework for self-force in hyperbolic black hole encounters

** Published:**