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Oscillations in the inflaton potential?

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arxiv 0807.0322 v1 pith:XLU6PADY submitted 2008-07-02 astro-ph

Cédric Pahud , Marc Kamionkowski , Andrew R Liddle This is my paper · ORCID
classification astro-ph
keywords oscillationsinflatonpotentialamplitudemicrowavepowerspectrumanisotropy
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We consider a class of inflationary models with small oscillations imprinted on an otherwise smooth inflaton potential. These oscillations are manifest as oscillations in the power spectrum of primordial perturbations, which then give rise to oscillating departures from the standard cosmic microwave background power spectrum. We show that current data from the Wilkinson Microwave Anisotropy Probe constrain the amplitude of a sinusoidal variation in the inflaton potential to have an amplitude less than 3 x 10^{-5}. We anticipate that the smallest detectable such oscillations in Planck will be roughly an order of magnitude smaller, with slight improvements possible with a post-Planck cosmic-variance limited experiment.

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Cited by 3 Pith papers

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    Slow-roll inflation can sustain a subdominant non-thermal radiation bath through narrow parametric resonance, producing observable oscillatory features in the curvature power spectrum and secondary gravitational waves.

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