Speaker
Description
Galaxy clusters have long proven to be a valuable cosmological tool: arising from the highest peaks of the matter density field, they serve as sensitive probes of the growth of structures and cosmic expansion. Current and upcoming wide-area surveys --- such as DES, Euclid, Rubin LSST, eROSITA, SPT and ACT --- seek to use the abundance and spatial distribution of galaxy clusters detected across different wavelengths to improve constraints on the late-time normalization of the matter power spectrum, dark energy and modified gravity models. One of the main limitations for the exploitation of such datasets resides in our capability to calibrate selection functions and recover unbiased cluster mass estimates from observable mass proxies.
In this review talk, I will provide an overview of the results and challenges encountered by current cluster cosmological studies at different wavelengths, emphasizing the key role of multi-wavelength observations in mitigating different sources of systematics, including contaminations, selection and mass biases, and miscentering. I will linger on the lessons learned from the analysis of the Dark Energy Survey photometric cluster catalog and conclude by discussing future directions and perspectives of multi-wavelength cluster cosmology studies.
