Search Publications
Limits on anisotropic inflation from the Planck data
Komatsu, Eiichiro; Kim, Jaiseung
Temperature anisotropy of the cosmic microwave background offers a test of the fundamental symmetry of spacetime during cosmic inflation. Violation of rotational symmetry yields a distinct signature in the power spectrum of primordial fluctuations as P(k)=P0(k)[1+g*(k^·E^cl)2], where E^cl is a…
Distance priors from Planck and dark energy constraints from current data
Wang, Yun; Wang, Shuang
We derive distance priors from Planck first data release, and examine their impact on dark energy constraints from current observational data. We give the mean values and covariance matrix of {R,la,Ωbh2,ns}, which give an efficient summary of Planck data. The cosmic microwave background shift parameters …
Planck constraints on single-field inflation
Kuroyanagi, Sachiko; Ohashi, Junko; Tsujikawa, Shinji +1 more
We place observational constraints on slow-variation single-field inflationary models by carrying out the cosmological Monte Carlo simulation with the recent data of Planck combined with the WMAP large-angle polarization, baryon acoustic oscillations, and Atacama Cosmology Telescope/South Pole Telescope temperature data. Our analysis covers a wide…
Sterile neutrinos: Cosmology versus short-baseline experiments
Melchiorri, Alessandro; Archidiacono, Maria; Fornengo, Nicolao +2 more
Cosmology and short-baseline (SBL) neutrino oscillation data both hint at the existence of light sterile neutrinos with masses in the 1 eV range. Here we perform a detailed analysis of the sterile neutrino scenario using both cosmological and SBL data. We have additionally considered the possibility that the extra neutrino degrees of freedom are n…
Testing modified gravity with Planck: The case of coupled dark energy
Pettorino, Valeria
The Planck collaboration has recently published maps of the cosmic microwave background (CMB) radiation, in good agreement with a ΛCDM model, a fit especially valid for multipoles ℓ>40. We explore here the possibility that dark energy is dynamical and gravitational attraction between dark matter particles is effectively different from the stand…
Dark energy constraints after the new Planck data
Zhang, Xinmin; Xia, Jun-Qing; Li, Hong
The Planck Collaboration has recently published maps of the cosmic microwave background radiation with the highest precision. In the standard flat Λ cold dark matter framework, Planck data show that the Hubble constant H0 is in tension with that measured by the several direct probes on H0. In this paper, we perform a global a…
Constraints on the Brans-Dicke gravity theory with the Planck data
Chen, Xuelei; Li, Yi-Chao; Wu, Feng-Quan
Based on the new cosmic microwave background temperature data from the Planck satellite, the nine-year polarization data from the Wilkinson Microwave Anisotropy Probe, and the baryon acoustic oscillation distance ratio data from the Sloan Digital Sky Survey and Six-Degree-Field surveys, we place a new constraint on the Brans-Dicke theory. We adopt…
Constraints on neutrino masses from Planck and Galaxy clustering data
Ho, Shirley; Mena, Olga; Giusarma, Elena +1 more
We present here bounds on neutrino masses from the combination of recent Planck cosmic microwave background (CMB) measurements and galaxy clustering information from the Baryon Oscillation Spectroscopic Survey, part of the Sloan Digital Sky Survey-III. We use the full shape of either the photometric angular clustering (Data Release 8) or the 3D sp…
General dissipative coefficient in warm intermediate and logamediate inflation
Videla, Nelson; Herrera, Ramón; Olivares, Marco
We study a general form for the dissipative coefficient Γ(T,ϕ)=CϕTm/ϕm-1 in the context of warm intermediate and logamediate inflationary universe models. We analyze these models in the weak and strong dissipative regimes. In the slow-roll approximation, we describe in great detail the characteristics of these mode…
Updating constraints on inflationary features in the primordial power spectrum with the Planck data
Benetti, Micol
We present new constraints on possible features in the primordial inflationary density perturbation power spectrum in light of the recent cosmic microwave background anisotropy measurements from the Planck satellite. We found that the Planck data hints for the presence of features in two different ranges of angular scales, corresponding to multipo…