Abstract

Topics : - The Missing Baryons problem at low redshift - FUV and optical surveys - Challenges and detections in X-rays ​- Understanding the WHIM and its relationship to clusters and the CGM - The future of X-ray spectroscopy of the WHIM (Arcus, Lynx, Athena, super-DIOS, etc.) - Enrichment of gas in cluster outskirts and filaments, production of metals and transport of metals in the IGM.​