Volume 83, Number 2, July 2008
Article Number 29001
Number of page(s) 5
Section Geophysics, Astronomy and Astrophysics
Published online 02 July 2008
EPL, 83 (2008) 29001
DOI: 10.1209/0295-5075/83/29001

CMB and LSS constraints on a single-field model of inflation

J. S. Alcaniz1, 2, F. C. Carvalho1, 3, R. Silva4, 5 and J. A. S. Lima6

1  Observatório Nacional - 20921-400 Rio de Janeiro, RJ, Brasil
2  Instituto Nacional de Pesquisas Espaciais/CRN - 59076-740, Natal, RN, Brasil
3  Instituto Nacional de Pesquisas Espaciais, Divisão de Astrofísica - 12227-010, São José dos Campos, SP, Brasil
4  Universidade do Estado do Rio Grande do Norte, Departamento de Física - PPGF - 59610-210, Mossoró, RN, Brasil
5  Universidade Federal do Rio Grande do Norte, Departamento de Física - PPGF - 59072-970 Natal, RN, Brasil
6  Universidade de São Paulo - 05508-900 São Paulo, SP, Brasil

received 30 January 2008; accepted in final form 2 June 2008; published July 2008
published online 2 July 2008

A new inflationary scenario whose exponential potential $V(\Phi)$ has a quadratic dependence on the field $\Phi $ in addition to the standard linear term is confronted with the five-year observations of the Wilkinson-Microwave Anisotropy Probe and the Sloan Digital Sky Survey data. The number of e-folds (N), the ratio of tensor-to-scalar perturbations (r), the spectral scalar index of the primordial power spectrum (ns) and its running (dns/d ln k) depend on the dimensionless parameter $\alpha $ multiplying the quadratic term in the potential. In the limit $\alpha \rightarrow 0$ all the results of the exponential potential are fully recovered. For values of $\alpha \ne 0$, we find that the model predictions are in good agreement with the current observations of the Cosmic Microwave Background (CMB) anisotropies and Large-Scale Structure (LSS) in the Universe.

98.80.-k - Cosmology.

© EPLA 2008