WMAP and Supergravity Inflationary Models

Details WMAP and Supergravity Inflationary Models WMAP and Supergravity Inflationary Models

2003-07-04

arxiv.org/abs/astro-ph/0307093v4

Phys.Rev.D69:023508,2004

Astronomy and Astrophysics

Astrophysics

7 pages, 4 eps figures, references corrected, version to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.69.023508

We study a class of N=1 Supergravity inflationary models in which the evolution of the inflaton dynamics is controlled by a single power in the inflaton field at the point where the observed density fluctuations are produced, in the context of the braneworld scenario, in light of WMAP results. In particular, we find that the bounds on the spectral index and its running constrain the parameter space both for models where the inflationary potential is dominated by a quadratic term and by a cubic term in the inflaton field. We also find that $\alpha_s>0$ is required for the quadratic model whereas $\alpha_s<0 $ for the cubic model. Moreover, we have determined an upper bound on the five-dimensional Planck scale, $M_5 \lsim 0.019$ M, for the quadratic model. On the other hand, a running spectral index with $n_s>1$ on large scales and $n_s<1$ on small scales is not possible in either case.

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