2010

Primordial features due to a step in the inflaton potential

Hazra, Dhiraj Kumar, Aich, Moumita, Jain, Rajeev Kumar et al.

Understand

Certain oscillatory features in the primordial scalar power spectrum are known to provide a better fit to the outliers in the cosmic microwave background data near the multipole moments of $\ell=22$ and 40.

These features are usually generated by introducing a step in the popular, quadratic potential describing the canonical scalar field.
Such a model will be ruled out, if the tensors remain undetected at a level corresponding to a tensor-to-scalar ratio of, say, $r\simeq 0.1$.
In this work, in addition to the popular quadratic potential, we investigate the effects of the step in a small field model and a tachyon model.

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