Search Publications

The evens and odds of CMB anomalies

Gruppuso, A.; Lattanzi, M.; Mandolesi, N. +3 more

The lack of power of large-angle CMB anisotropies is known to increase its statistical significance at higher Galactic latitudes, where a string-inspired pre-inflationary scale Δ can also be detected. Considering the Planck 2015 data, and relying largely on a Bayesian approach, we show that the effect is mostly driven by the even - ℓ harmonic mult…

New limits on coupled dark energy model after Planck 2015

Yang, Weiqiang; Wu, Yabo; Li, Hang +1 more

We used the Planck 2015 cosmic microwave background anisotropy, baryon acoustic oscillation, type-Ia supernovae, redshift-space distortions, and weak gravitational lensing to test the model parameter space of coupled dark energy. We assumed the constant and time-varying equation of state parameter for dark energy, and treated dark matter and dark …

An analytical approach to the CMB polarization in a spatially closed background

Niazy, Pedram; Abbassi, Amir H.

The scalar mode polarization of the cosmic microwave background is derived in a spatially closed universe from the Boltzmann equation using the line of sight integral method. The EE and TE multipole coefficients have been extracted analytically by considering some tolerable approximations such as considering the evolution of perturbation hydrodyna…