Abstract
B-mode polarization of the cosmic background radiation is induced from purely scalar primordial sources at second order in perturbations of the homogeneous, isotropic universe. We calculate the B-mode angular power spectrum ClBB sourced by the second-order scattering term in the full second-order Boltzmann equations for the polarized radiation phase-space density, which have recently become available. We find that at l ≈ 200 the second-order effect is comparable to the first-order effect for a tensor-to-scalar ratio of r = 10-6, and to about 2·10 -4 at l ≈ 1000. It is always negligible relative to the weak-lensing induced contribution.
Originalsprache | Englisch |
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Aufsatznummer | 008 |
Fachzeitschrift | Journal of Cosmology and Astroparticle Physics |
Jahrgang | 2011 |
Ausgabenummer | 4 |
DOIs | |
Publikationsstatus | Veröffentlicht - Apr. 2011 |
Extern publiziert | Ja |