Wiggles in the cosmic microwave background radiation: echoes from non-singular cyclic-inflation

TL;DR

This paper proposes a cyclic-inflation model where the universe oscillates rapidly, leaving distinctive signatures in the cosmic microwave background, and fits well with WMAP data.

Contribution

It introduces a novel cyclic-inflation model with rapid oscillations that mimic standard inflation and produce observable signatures in the primordial power spectrum.

Findings

The model fits WMAP 7-year data well.

Oscillations produce periodic signatures in ln(k).

Rapid cycles expand to resemble standard inflation.

Abstract

In this paper we consider a unique model of inflation where the universe undergoes rapid asymmetric oscillations, each cycle lasting millions of Planck time. Over many-many cycles the space-time expands to mimic the standard inflationary scenario. Moreover, these rapid oscillations leave a distinctive periodic signature in ln(k) in the primordial power spectrum, where k denotes the comoving scale. The best fit parameters of the cyclic-inflation model provides a very good fit to the 7-year WMAP data.