CMB Lensing and Scale Dependent New Physics

Abstract

Cosmic microwave background lensing has become a new cosmological probe, carrying rich information on the matter power spectrum and distances over the redshift range $z\approx 1$-4. We investigate the role of scale dependent new physics, such as from modified gravity, neutrino mass, and cold (low sound speed) dark energy, and its signature on CMB lensing. The distinction between different scale dependences, and the different redshift dependent weighting of the matter power spectrum entering into CMB lensing and other power spectra, imply that CMB lensing can probe simultaneously a diverse range of physics. We highlight the role of arcminute resolution polarization experiments for distinguishing between physical effects.

9 pages, 8 figures; v2 added 2 figures, some more details, matches PRD version

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Cited by in corpus (5)

• Testing General Relativity in Cosmology
• A Vacuum Phase Transition Solves $H_0$ Tension
• Variable sound speed in interacting dark energy models
• Gaugessence: a dark energy model with early time radiation-like equation of state
• Cold dark energy constraints from the abundance of galaxy clusters