title: Can cosmic shear shed light on low cosmic microwave background multipoles?
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.
authors.affiliation: California Institute of Technology, Mail Code 130-33, Pasadena, CA 91125, USA.
authors.forename: Michael
authors.initials: M
authors.lastname: Kesden
authors.forename: Marc
authors.initials: M
authors.lastname: Kamionkowski
authors.forename: Asantha
authors.initials: A
authors.lastname: Cooray