Search Publications
New constraints on coupled dark energy from the Planck satellite experiment
Mena, Olga; Salvatelli, Valentina; Marchini, Andrea +1 more
We present new constraints on coupled dark energy from the recent measurements of the cosmic microwave background anisotropies from the Planck satellite mission. We found that a coupled dark energy model is fully compatible with the Planck measurements, deriving a weak bound on the dark matter-dark energy coupling parameter ξ=-0.49-0.31…
Obtaining the CMB anomalies with a bounce from the contracting phase to inflation
Liu, Zhi-Guo; Guo, Zong-Kuan; Piao, Yun-Song
Recent Planck data show the anomalies of cosmic microwave background (CMB) fluctuations on large angular scales, which confirms the early observations by WMAP. We continue studying an inflationary model, in which before the slow-roll inflation the universe is in a contracting phase, and fit the model with the Planck data. We show that this model m…
Constraints on millicharged particles from Planck data
Dolgov, A. D.; Tkachev, I. I.; Rubtsov, G. I. +1 more
We revisit cosmic microwave background constraints on the abundance of millicharged particles based on the Planck data. The stringent limit Ωmcph2<0.001 (95% CL) may be set using the cosmic microwave background data alone if millicharged particles participate in the acoustic oscillations of baryon-photon plasma at the reco…
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…