Can cosmic shear shed light on low cosmic microwave background multipoles?
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Updated: Aug 29, 2026

Scattering And Absorption of Light in Planetary Regoliths
Published on: July 1, 2019
Michael Kesden1, Marc Kamionkowski, Asantha Cooray
1California Institute of Technology, Mail Code 130-33, Pasadena, CA 91125, USA.
Abstract:
The lowest multipole moments of the cosmic microwave background (CMB) are smaller than expected for a scale-invariant power spectrum. One possible explanation is a cutoff in the primordial power spectrum below a comoving scale of k(c) approximately equal to 5.0 x 10(-4) Mpc(-1). Such a cutoff would increase significantly the cross correlation between the large-angle CMB and cosmic-shear patterns. The cross correlation may be detectable at >2sigma which, combined with the low CMB moments, may tilt the balance between a 2sigma result and a firm detection of a large-scale power-spectrum cutoff. The cutoff also increases the large-angle cross correlation between the CMB and the low-redshift tracers of the mass distribution.
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