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A string-inspired model for the low-ℓ CMB

Sagnotti, A.; Kitazawa, N.

We present a semi-analytic exploration of some low-ℓ angular power spectra inspired by “brane supersymmetry breaking (BSB)”. This mechanism splits Bose and Fermi excitations in string theory, leaving behind an exponential potential that is just too steep for the inflaton to emerge from the initial singularity while descending it. As a result, the …

Testing isotropy of cosmos with WMAP and PLANCK data

Rath, Pranati K.; Samal, Pramoda Kumar

In recent years, there have been a large number of studies which support violation of statistical isotropy. Meanwhile, there are some studies which also found inconsistency. We use the power tensor method defined earlier in the literature to study the new CMBR data. The orientation of these three orthogonal vectors, as well as the power associated…

On the detection of point sources in Planck LFI 70 GHz CMB maps based on cleaned K-map

Kashin, A. L.; Khachatryan, H. G.; Poghosyan, E. +1 more

We use the Planck LFI 70 GHz data to further probe point source detection technique in the sky maps of the cosmic microwave background (CMB) radiation. The method developed by Tegmark et al. for foreground reduced maps and the Kolmogorov parameter as the descriptor are adopted for the analysis of Planck satellite CMB temperature data. Most of the …