Single Field Inflation models allowed and ruled out by the three years WMAP data

Details Single Field Inflation models allowed and ruled out by the three years WMAP data Single Field Inflation models allowed and ruled out by the three years WMAP data

2006-04-06

arxiv.org/abs/astro-ph/0604136v3

Phys. Rev. D 74, 063519 (2006)

Astronomy and Astrophysics

Astrophysics

Some comments and a few new results added

Scientific paper

10.1103/PhysRevD.74.063519

We study the single field slow-roll inflation models that better fit the available CMB and LSS data including the three years WMAP data: new inflation and hybrid inflation. We study them as effective field theories in the Ginsburg-Landau context: a trinomial potential turns out to be a simple and well motivated model. The compute the spectral index n_s of the adiabatic fluctuations, the ratio r of tensor to scalar fluctuations and the running index d n_s/dln k, derive explicit formulae and provide relevant plots. In new inflation, and for the three years WMAP central value n_s = 0.95, we predict 0.031. Hybrid inflation for mu_0^2>Lambda_0 M_{Pl}^2/192 can fullfill all the present CMB+LSS data. Even if chaotic inflation predicts n_s values compatible with the data, chaotic inflation is disfavoured since it predicts a too high value for the ratio r=0.27. The model which best fits the current data and which best prepares the way to the expected data r < 0.1, is the trinomial potential with negative mass term: new inflation.

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