Predictions of justenough inflation
Abstract
We find the bestfit cosmological parameters for a scenario of inflation with only the sufficient amount of accelerated expansion for the λϕ^{4} potential. While for the simplest scenario of chaotic inflation all observable primordial fluctuations cross the Hubble horizon during the slowroll epoch, for the scenario of justenough inflation the slowroll conditions are violated at the largest length scales. Performing a numerical modebymode integration for the perturbations on the largest scales and comparing the predicted anisotropies of the cosmic microwave background to results from the WMAP 7yr data analysis, we find the initial conditions in agreement with current cosmological data. In contrast to the simplest chaotic model for the quartic potential, the justenough inflation scenario is not ruled out. Although this scenario naturally gives rise to a modification of the first multipoles, for a quartic potential it cannot explain the lack of power at the largest angular scales.
 Publication:

Physical Review D
 Pub Date:
 May 2012
 DOI:
 10.1103/PhysRevD.85.103516
 arXiv:
 arXiv:1111.7131
 Bibcode:
 2012PhRvD..85j3516R
 Keywords:

 98.80.Cq;
 Particletheory and fieldtheory models of the early Universe;
 Astrophysics  Cosmology and Extragalactic Astrophysics;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Theory
 EPrint:
 12 pages, 8 figures, references added, presentation improved, matches published version