Karlsruhe 2011 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 22: Astroteilchenphysik und Kosmologie (Theorie)
T 22.8: Vortrag
Mittwoch, 30. März 2011, 18:30–18:45, 30.23: 3-1
B polarization of cosmic background radiation from second-order scattering sources at recombination — Martin Beneke, •Christian Fidler, and Klaus Klingmueller — RWTH Aachen
The CMB provides detailed information about the early Universe. Temperature anisotropies and E-mode polarization have been measured and provide insight into the composition and evolution of the Universe. B-mode polarization is especially interesting, as it is connected to the presence of primordial gravitational waves (tensor perturbations) from inflation at first order in cosmological perturbation theory. However, at second order it can be induced from purely scalar sources. We calculate the B-mode power spectrum induced by the second-order scattering term and find results which compete with a scalar-to-tensor ratio of 10−6 at l=100 and 10−4 at l = 1000.