Volume 79, Number 3, August 2007
Article Number 39001
Number of page(s) 5
Section Geophysics, Astronomy and Astrophysics
Published online 12 July 2007
EPL, 79 (2007) 39001
DOI: 10.1209/0295-5075/79/39001

$\mth{\beta}$-exponential inflation

J. S. Alcaniz and F. C. Carvalho

Departamento de Astronomia, Observatório Nacional - 20921-400 Rio de Janeiro - RJ, Brazil

received 27 February 2007; accepted in final form 11 June 2007 ; published August 2007
published online 12 July 2007

An inflationary scenario driven by a slow rolling homogeneous scalar field whose potential $V(\Phi)$ is given by a generalized exponential function is discussed. Within the slow-roll approximation we investigate some of the main predictions of the model and compare them with current data from Cosmic Microwave Background and Large-Scale Structure observations. In particular, we show that this single scalar field model admits a wider range of solutions than do conventional exponential scenarios and predicts acceptable values of the scalar spectral index and of the tensor-to-scalar ratio for the remaining number of e-folds lying in the interval N = 54$\pm$7 and energy scales of the order of Planck scale. The running of the spectral index is briefly discussed to show that both negative and positive values are predicted by the model here proposed.

98.80.Cq - Particle-theory and field-theory models of the early Universe (including cosmic pancakes, cosmic strings, chaotic phenomena, inflationary universe, etc.).

© Europhysics Letters Association 2007