Conference: Meeting of the National Research Group on Gravitational Waves

Session

Contributed talks: Waveforms

30 mars 2021, 09:30

7. Spinning black holes fall in Love

Dr Alexandre Le Tiec (Observatoire de Paris)

30/03/2021 09:30

FORMES D’ONDE

The open question of whether a black hole can become tidally deformed by an external gravitational field has profound implications for fundamental physics, astrophysics and gravitational-wave astronomy. Love tensors characterize the tidal deformability of compact objects such as astrophysical (Kerr) black holes under an external static tidal field. We prove that all Love tensors vanish...

2. Effective two-body approach to the hierarchical three-body problem

Adrien Kuntz (Scuola Normale Superiore, Pisa)

30/03/2021 09:45

FORMES D’ONDE

The three body-problem, even in the simple Newtonian case, exhibits very rich dynamical behaviors. The study of a hierachical configuration, in which a close inner binary is orbited by a distant perturber, has been initiated by Lidov and Kozai in the 60's. The eccentricity oscillations that they discovered is particularly relevant to gravitational wave astronomy. On the other hand, several...

6. Schwarzschild-Tangherlini metric from scattering amplitudes in various dimensions

Stavros Mougiakakos (IPhT,CEA-Saclay)

30/03/2021 10:00

FORMES D’ONDE

We derive the static Schwarzschild-Tangherlini metric by extracting the classical contributions from the multiloop vertex functions of a graviton emitted from a massive scalar field. At each loop order the classical contribution is proportional to a unique master integral given by the massless sunset integral. By computing the scattering amplitudes up to three-loop order in general dimension,...

55. Gravitational Bremsstrahlung in the Post-Minkowskian Effective Field Theory

Massimiliano Maria Riva

30/03/2021 10:15

FORMES D’ONDE

We study the gravitational radiation emitted during the scattering of two spinless bodies in the post-Minkowskian Effective Field Theory approach. We derive the conserved stress-energy tensor linearly coupled to gravity and the classical probability amplitude of graviton emission at leading and next-to-leading order in the Newton’s constant $G$. The amplitude can be expressed in compact
form...