Cinquième Assemblée Générale du GdR Ondes Gravitationnelles

Session

Groupe de Travail: Tests de la relativité générale et théories alternatives

11 oct. 2021, 16:45

LAPP - Laboratoire d'Annecy de Physique des Particules

12. Gravitational Waves in Scalar-Tensor Theory to one-and-a-half post-Newtonian order

David Trestini (IAP et LUTH)

11/10/2021 16:45

TESTS DE LA RELATIVITÉ GÉNÉRALE ET THÉORIES ALTERNATIVES

We compute the gravitational waves generated by compact binary systems in a class of massless scalar-tensor (ST) theories to the 1.5 post-Newtonian order beyond the standard quadrupole radiation in general relativity (GR). Using (and adapting) the multipolar-post-Minkowskian and post-Newtonian formalism in GR we obtain in particular the tail and non-linear memory terms associated with the...

20. Search for spacetime symmetry breaking during gravitational waves propagation

Leïla Haegel (Laboratoire APC)

11/10/2021 17:00

TESTS DE LA RELATIVITÉ GÉNÉRALE ET THÉORIES ALTERNATIVES

It has been postulated that a unified theory of physics may break local Lorentz invariance and CPT symmetry. A general effective field theory predicts that such violation lead to anisotropic, polarization-dependent dispersion the gravitational waves during their propagation. Using a Bayesian inference analysis, we constrain the coefficients responsible of spacetime symmetry breaking with the...

17. Searching for scalars in spinning binaries

Leong Khim Wong (IPhT, Université Paris-Saclay)

11/10/2021 17:15

TESTS DE LA RELATIVITÉ GÉNÉRALE ET THÉORIES ALTERNATIVES

Light scalar fields that couple disformally to matter are a common feature in many alternative theories of gravity, such as in (beyond) Horndeski and general DHOST theories, in the decoupling limit of massive gravity, and in various brane-world scenarios. Exploring how well this kind of interaction is constrained by observational data thus provides valuable information for distinguishing...