Observational constraints on warm natural inflation

Observational constraints on particle production during inflation

Resonant particle production, along with many other physical processes which change the effective equation of state (EOS) during inflation, introduces a feature in the primordial power spectrum which in many models has a step-like shape. We calculate observational constraints on resonant particle production, parametrized in the form of an effective step height, Neff and location in k-space, kbr...

Observational Constraints on Non-Canonical Inflation

Constraints on Natural Inflation from Cosmic Microwave

We study constraints on the natural inflation model from the cosmic microwave background radiation (CMBR). Inflaton φ for the natural inflation has a potential of the form V = Λ4[1− cos(φ/ √ 2fφ)], which is parametrized by two parameters fφ and Λ. Various cosmological quantities, like the primordial curvature perturbation and the CMBR anisotropy, are determined as functions of these two paramet...

Inflation Models, Spectral Index and Observational Constraints

We have evaluated the observational constraints on the spectral index n, in the context of a ΛCDM model. For n scale-independent, as predicted by most models of inflation, present data require n ≃ 1.0 ± 0.1 at the 2-σ level. We have also studied the two-parameter scale-dependent spectral index, predicted by running-mass inflation models. Present data allow significant variation of n in this cas...

Observational Constraints on Inflation Models with Nonminimal Scalar Field

The power spectra of the scalarand tensor-type structures generated in an inflation model based on nonminimally coupled scalar field are derived. The contributions of these structures to the anisotropy of the cosmic microwave background radiation are derived, and are compared with the four year COBE DMR data. The constraints on the ratio of the self-coupling and nonmimimal coupling constants, t...