Orateur
Description
The compelling evidence for the presence of nHz gravitational waves (GWs) in pulsar timing data calls for a refinement of what can and cannot be expected beyond vanilla scenarios. Under the hypothesis of an astrophysical origin for the GWs, we discuss possible imprints left in the signal by the fact the Universe is inherently clustered, with anisotropic large scale structure.
At the background level, this should imply primary anisotropies in the GW signal. Distinguishing the latter from the Poisson anisotropies due to the discreteness of sources appears as a challenge for which cross-correlations with galaxy catalogues is a promising approach.
If time allows, we may also discuss secondary imprints induced by the clustered Universe on individual continuous wave signals from supermassive binaries.