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Anisotropic power spectrum and the observed low-l power in PLANCK CMB data

Rath, Pranati K.; Zhao, Dong; Chang, Zhe +1 more

In this work, we study a direction dependent power spectrum in anisotropic Finsler space-time. We use this direction dependent power spectrum to address the low-l power observed in WMAP and PLANCK data. The angular power spectrum of the temperature fluctuations has a lower amplitude in comparison to the ΛCDM model in the multipole range l = 2 - 40…

Smoothing methods comparison for CMB E- and B-mode separation

Wang, Yi-Fan; Wang, Kai; Zhao, Wen

The anisotropies of the B-mode polarization in the cosmic microwave background radiation play a crucial role in the study of the very early Universe. However, in real observations, a mixture of the E-mode and B-mode can be caused by partial sky surveys, which must be separated before being applied to a cosmological explanation. The separation meth…

Probing the Lambda-DGP Braneworld model

Ravanpak, Arvin; Farajollahi, Hossein; Fadakar, Golnaz

We study cosmic dynamics in the context of the normal branch of the DGP braneworld model. Using current Planck data, we find the best fitting model and associated cosmological parameters in non-flat ΛDGP. With the transition redshift as a basic variable and statefinder parameters, our result shows that the Universe starts its accelerated expansion…