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AR 14291 (Archival Research)

Mon Jul 15 04:59:48 GMT 2024

Principal Investigator: Neal Dalal
PI Institution: Perimeter Institute for Theoretical Physics
Investigators (xml)

Title: Backsplash as a probe of cosmology
Cycle: 23

Abstract
We propose to investigate a newly discovered feature in the density profiles of dark matter halos found in numerical simulations. This feature, a localized steepening of the density profile associated with backsplash material, could provide a calibratable standard ruler enabling new probes of the background cosmology. The proposed theoretical work would directly benefit HST observing programs that measure weak gravitational lensing of galaxy clusters, by providing a new cosmological test that cluster observations could perform, possibly using existing data.