Stephanie Escoffier

Euclid: The linear-construction covariance and cosmology

We study the properties of galaxy cluster two-point correlation function covariance matrices estimated using the linear-construction (LC) method, which is computationally up to 20 times faster than the standard sample-covariance method. Our goal is to assess how well the LC metho...

The Back-in-time Void Finder: Dynamical identification of cosmic voids through optimal transport reconstruction

Cosmic voids have increasingly emerged as a powerful cosmological probe. However, their large spatial extent and intrinsically underdense environments make their identification highly sensitive to shot noise, redshift-space distortions (RSDs), and observational systematics, parti...