Mathematics – Logic
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012hell.conf...15c&link_type=abstract
10th Hellenic Astronomical Conference, Proceedings of the conference held at Ioannina, Greece, 5-8 September 2011. Edited by Io
Mathematics
Logic
Scientific paper
I will speak about recent developments in the measurements of the weak gravitational signal from maps of the cosmic microwave background (CMB) radiation. This signal is regarded as a contaminant of the primordial signal, but simultaneously it contains information on the large-scale matter distribution. Weak lensing of the CMB results from the coupling of the CMB photons to the gravitational potential integrated along the line of sight. Whereas lensing of galaxy shapes probes up to z~2, lensing of the CMB probes up to the last-scattering surface at z~1000 thus being a powerful tool for cosmology. Weak lensing generates a non-Gaussian pattern on the CMB temperature, while conserving the surface brightness. Hence, estimators of the weak lensing signal are quadratic in the temperature maps. I will then speak about a novel estimator which acts in real space, contrary to conventional estimators which act in harmonic space. The novel estimator performs well in the presence of detector noise and cuts in the maps due to point source excisions. Time allowing, I will also speak about how to use weak lensing to study the nature of dark matter and constrain deviations from general relativity at cosmological scales.
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