B polarization of cosmic background radiation from second-order scattering sources

Journal Article · Fri Apr 01 00:00:00 EDT 2011 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2011/04/008· OSTI ID:22277835

Beneke, M.; Fidler, C.; Klingmüller, K. ^[1]

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1. Institut für Theoretische Teilchenphysik und Kosmologie, RWTH Aachen University, D-52056 Aachen (Germany)

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 C{sub l}{sup BB} 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{sup −6}, and to about 2·10{sup −4} at l ≈ 1000. It is always negligible relative to the weak-lensing induced contribution.

• OSTI ID: 22277835
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2011, Issue 04; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ASTROPHYSICS
BACKGROUND RADIATION
BOLTZMANN EQUATION
COMPARATIVE EVALUATIONS
COSMOLOGY
DENSITY
DISTURBANCES
PHASE SPACE
POLARIZATION
RELICT RADIATION
SCALARS
SCATTERING
TENSORS
UNIVERSE