How to constrain inflationary parameter space with minimal priors

Details How to constrain inflationary parameter space with minimal priors How to constrain inflationary parameter space with minimal priors

2008-02-05

arxiv.org/abs/0802.0505v1

JCAP 0804:016,2008

Astronomy and Astrophysics

Astrophysics

16 pages, 3 figures

Scientific paper

10.1088/1475-7516/2008/04/016

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. Nevertheless, it should be noted that within the region allowed by the minimal prior of the exact method, the accuracy of the approximations is sufficient for current data. We caution however that a careless minimal implementation of the approximative methods allows models for which the assumptions behind the analytical approximations fail, and recommend using the exact numerical method for a self-consistent analysis of cosmological data.

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