26th Capra Meeting on Radiation Reaction in General Relativity

Session

Friday Morning

7 Jul 2023, 09:00

Chr. Hansen Auditorium (Niels Bohr Institute)

Conveners

Friday Morning: Talks

• Chris Kavanagh

Friday Morning: Talks

• Chris Kavanagh

93. Symplectic mechanics of a spinning particle around a Schwarzschild black hole

Paul Ramond (Paris Observatory)

07/07/2023, 09:00

I will present a new Hamiltonian analysis of the motion of a spinning particle orbiting a Scwharzschild black hole. First I will reduce the Mathisson-Papapetrou equations at linear order in spin to a Poisson system. Second, I will present a reduction of this system to a 6 degrees-of-freedom (dof), constrained Hamiltonian system. Third, specialising to the Schwarzschild spacetime, a reduction...

47. Motion of spinning particles near Schwarzschild black holes: exact solution

Vojtech Witzany (Charles U., Prague)

07/07/2023, 09:20

The spin of the secondary in large mass ratio inspirals contributes to the inspiral phasing at the same order as the conservative self-force. Hence, treating the secondary spin at least to linear order is important for precise waveforms from these systems. In this talk I will present solutions of general motion of spinning test particles near a Schwarzschild black hole to linear order in spin...

85. On the effective action of compact objects from full GR

Neev Khera (University of Guelph)

07/07/2023, 09:40

Calculations involving compact objects, such as post-Newtonian (PN) or self-force calculations, are greatly simplified by treating the body as point particles. Going to higher orders in compactness introduces successively higher order multipolar structure to the compact object. Effective field theory methods provide a systematic tool to account for these finite size effects, by using an...

42. Extended-body motion, local symmetries, and Petrov types

Abraham Harte (Dublin City University)

07/07/2023, 10:00

To a first approximation, objects in general relativity move along geodesics. Looked at more closely, a body's internal structure affects its motion, causing different objects to fall in different ways. This talk will explore which extended-body effects are possible and which are not. For example, can an appropriately-engineered spacecraft escape from a bound orbit without the use of a rocket?...

55. Extreme mass-ratio inspiral of a spinning body into a Kerr black hole

Lisa Drummond (Massachusetts Institute of Technolohy)

07/07/2023, 11:00

Accurate models of large mass-ratio systems must include post-geodesic corrections, which account for forces driving the small body away from the geodesic. An important post-geodesic effect is gravitational self-force, which describes the small body's interaction with its own spacetime curvature. This effect includes the backreaction due to gravitational-wave emission that leads to the...

58. Asymptotic gravitational-wave fluxes from a spinning test body on generic orbits around a Kerr black hole

Viktor Skoupý (Astronomical Institute of the Czech Academy of Sciences; Charles University)

07/07/2023, 11:20

This work provides gravitational wave energy and angular momentum asymptotic fluxes from a spinning body moving on generic orbits in a Kerr spacetime up to linear in spin approximation. To achieve this, we have developed a new frequency domain Teukolsky equation solver that calculates asymptotic amplitudes from generic orbits of spinning bodies with their spin aligned with the total orbital...