Smoothing spline primordial power spectrum reconstruction

Details Smoothing spline primordial power spectrum reconstruction Smoothing spline primordial power spectrum reconstruction

2005-06-28

arxiv.org/abs/astro-ph/0506707v2

Phys.Rev.D72:103520,2005

Astronomy and Astrophysics

Astrophysics

12 pages, 10 figures. Accepted to PRD

Scientific paper

10.1103/PhysRevD.72.103520

We reconstruct the shape of the primordial power spectrum (PPS) using a smoothing spline. Our adapted smoothing spline technique provides a complementary method to existing efforts to search for smooth features in the PPS, such as a running spectral index. With this technique we find no significant indication with WMAP first-year data that the PPS deviates from Harrison-Zeldovich and no evidence for loss of power on large scales. We also examine the effect on the cosmological parameters of the additional PPS freedom. Smooth variations in the PPS are not significantly degenerate with other cosmological parameters, but the spline reconstruction greatly increases the errors on the optical depth and baryon fraction.

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