An astrometric method for gravitational wave detection

Gravitational waves have a periodic effect on the apparent positions of stars on the sky. This effect can be quantified and hence ultra-precise astrometric measurements (like the ones from Gaia) can provide a new method to search for gravitational signals. I will describe the principles which give rise to the astrometric signature of gravitational waves, and examine this result in the context of Einsteinian and alternative polarization states. I will discuss some of the data analysis challenges that will have to be overcome when trying to search for GWs in the extremely large (>10^9 stars) Gaia data set, and will present some preliminary estimates of the sensitivity that may be achievable. I will also describe the significance of astrometric measurements for probing stochastic GW backgrounds, and derive the relevant response correlation functions for all polarization modes. If time permits, I will also describe a novel method for constraining the speed of gravity by using astrometry. Throughout, I will keep a parallel between our work and analogous results from the PTA community.

Dates: 

Mardi, 8 juin, 2021 - 14:00 to 15:00

Localisation / Location: 

APC

Salle / Local: 

contact roperpol@apc.in2p3.fr for Zoom meeting details
  • Séminaire

Nom/Prénom // Last name/First name: 

Deyan Mihaylov

Affiliation: 

Max Planck Institute

Equipe(s) organisatrice(s) / Organizing team(s): 

  • Théorie

Pays / Country: 

Germany