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

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

Corresponding authors: alcaniz@on.br fabiocc@das.inpe.br raimundosilva@uern.br limajas@astro.iag.usp.br

Received: 30 January 2008
Accepted: 2 June 2008

Abstract

A new inflationary scenario whose exponential potential has a quadratic dependence on the field Φ 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 (n_s) and its running (dn_s/d ln k) depend on the dimensionless parameter α multiplying the quadratic term in the potential. In the limit all the results of the exponential potential are fully recovered. For values of , 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.