2008

How to constrain inflationary parameter space with minimal priors

Hamann, Jan, Lesgourgues, Julien, Valkenburg, Wessel

Understand

We update constraints on the Hubble function H(phi) during inflation, using the most recent cosmic microwave background (CMB) and large scale structure (LSS) data.

Our main focus is on a comparison between various commonly used methods of calculating the primordial power spectrum via analytical approximations and the results obtained by integrating the exact equations numerically.
In each case, we impose naive, minimally restrictive priors on the duration of inflation.
We find that the choice of priors has an impact on the results: the bounds on inflationary parameters can vary by up to a factor two.

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