Speaker
Camille Bonvin
(University of Cambridge)
Description
In the past few years it has been shown that the two-point correlation function of galaxies is affected by relativistic effects at large scales. Various terms like gravitational redshift, Doppler effects or time delay corrections induce subtle changes in the correlation function. These effects are however subdominant at all but the largest scales, rendering their detection challenging. In this talk, I will present a novel method to measure relativistic effects in large-scale structure by looking at the anti-symmetric part of the correlation function between two populations of galaxies. I will show that gravitational redshift and Doppler terms induce a dipolar modulation in the correlation function, which allows to isolate the relativistic effects at scales accessible by current surveys.
Author
Camille Bonvin
(University of Cambridge)
Co-authors
Prof.
Enrique Gaztanaga
(Institut de Ciencies de l'Espai, Barcelona)
Prof.
Lam Hui
(Columbia University)
