Reconstructing large scales at cosmic dawn
Selim C. Hotinli, Matthew C. Johnson
Abstract
The cosmic microwave background (CMB) serves as a backlight to large-scale structure during the epoch of reionization, where Thomson scattering gives rise to temperature anisotropies on small angular scales from the kinetic Sunyaev Zel'dovich (kSZ) effect. In this paper, we demonstrate that the technique of kSZ tomography (velocity reconstruction), based on cross-correlations between CMB temperature and 21-cm surveys, can significantly improve constraints on models of inhomogeneous reionization and provide information about large-scale modes that are poorly characterized by 21-cm measurements themselves due to foreground contamination.
Topics & Concepts
Cosmic microwave backgroundReionizationPhysicsAstrophysicsCOSMIC cancer databaseAnisotropyScale (ratio)Thomson scatteringSunyaev–Zel'dovich effectScatteringComputational physicsAstronomyOpticsRedshiftGalaxyQuantum mechanicsRadio Astronomy Observations and TechnologyAstrophysics and Cosmic PhenomenaCosmology and Gravitation Theories