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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
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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
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.'
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
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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