Search Publications
Planck constraints on the effective neutrino number and the CMB power spectrum lensing amplitude
Di Valentino, Eleonora; Gerbino, Martina; Said, Najla
We present new constraints on the relativistic neutrino effective number Neff and on the cosmic microwave background power spectrum lensing amplitude AL from the recent Planck 2013 data release. Including observations of the cosmic microwave background large angular scale polarization from the Wilkinson microwave anisotropy p…
Updated constraints from the Planck experiment on modified gravity
Salvatelli, Valentina; Marchini, Andrea
A modification of the action of the general relativity produces a different pattern for the growth of the cosmic structures below a certain length scale leaving an imprint on the cosmic microwave background anisotropies. We reexamine the upper limits on the length-scale parameter B0 of f(R) models using the recent data from the Planck s…
Neutrino anisotropies after Planck
Di Valentino, Eleonora; Gerbino, Martina; Said, Najla
We present new constraints on the rest-frame sound speed, ceff2, and the viscosity parameter, cvis2, of the cosmic neutrino background from the recent measurements of the cosmic microwave background anisotropies provided by the Planck satellite. While broadly consistent with the expectations of ceff…
Confronting brane inflation with Planck and pre-Planck data
Zhang, Xin; Huang, Qing-Guo; Ma, Yin-Zhe
In this paper, we compare brane inflation models with the Planck data and the pre-Planck data (which combines WAMP, ACT, SPT, BAO and H0 data). The Planck data prefer a spectral index less than unity at more than 5σ confidence level, and a running of the spectral index at around 2σ confidence level. We find that the KKLMMT model can sur…