Speaker
Giuseppe Fanizza
(LUM University)
Description
In this talk, I will present the full expression for the redshift-drift at second-order in perturbation theory, corroborate its validity by explicitly showing its gauge-invariance for both the observer and source terms, and discuss its validity also for cosmological models beyond LambdaCDM. Afterwards, I will discuss the geometrical hierarchy of the leading terms at leading and next-to-leading order and quantify how well redshift-drift can provide in the future a new dataset to test cosmological models in the nonlinear regime.
Based on arXiv:2604.26690
Author
Giuseppe Fanizza
(LUM University)