WMAP and inflation
Abstract
We assay how inflationary models whose properties are dominated by the dynamics of a single scalar field are constrained by cosmic microwave background (CMB) data from the Wilkinson Microwave Anisotropy Probe (WMAP). We classify inflationary models in a plane defined by the horizonflow parameters. Our approach differs from that of the WMAP Collaboration in that we analyze only WMAP data and take the spectral shapes from slowroll inflation rather than powerlaw parameterizations of the spectra. The only other information we use is the measurement of /h from the Hubble Space Telescope (HST) Key Project. We find that the spectral index of primordial density perturbations lies in the /1σ range 0.94<=n_{s}<=1.04 with no evidence of running. The ratio of the amplitudes of tensor and scalar perturbations is smaller than /0.61 and the inflationary scale is below 2.8×10^{16} GeV, both at the /2σ C.L. No class of inflation or ekpyrotic/cyclic model is excluded. The λφ^{4} potential is excluded at /3σ only if the number of efolds is assumed to be less than 45.
 Publication:

Physics Letters B
 Pub Date:
 July 2003
 DOI:
 10.1016/S03702693(03)007573
 arXiv:
 arXiv:hepph/0302150
 Bibcode:
 2003PhLB..565...33B
 Keywords:

 High Energy Physics  Phenomenology;
 Astrophysics;
 High Energy Physics  Theory
 EPrint:
 7 pages, 3 figures. Version to appear in PLB