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Title: Smoothing spline primordial power spectrum reconstruction

Abstract

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 Wilkinson Microwave Anisotropy Probe first-year data that the PPS deviates from a Harrison-Zeldovich spectrum 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.

Authors:
; ;  [1]
  1. Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104 (United States)
Publication Date:
OSTI Identifier:
20711547
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 72; Journal Issue: 10; Other Information: DOI: 10.1103/PhysRevD.72.103520; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ANISOTROPY; BARYONS; COSMIC RADIATION; COSMOLOGY; ENERGY SPECTRA; RADIOWAVE RADIATION; RELICT RADIATION

Citation Formats

Sealfon, Carolyn, Verde, Licia, and Jimenez, Raul. Smoothing spline primordial power spectrum reconstruction. United States: N. p., 2005. Web. doi:10.1103/PhysRevD.72.103520.
Sealfon, Carolyn, Verde, Licia, & Jimenez, Raul. Smoothing spline primordial power spectrum reconstruction. United States. doi:10.1103/PhysRevD.72.103520.
Sealfon, Carolyn, Verde, Licia, and Jimenez, Raul. Tue . "Smoothing spline primordial power spectrum reconstruction". United States. doi:10.1103/PhysRevD.72.103520.
@article{osti_20711547,
title = {Smoothing spline primordial power spectrum reconstruction},
author = {Sealfon, Carolyn and Verde, Licia and Jimenez, Raul},
abstractNote = {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 Wilkinson Microwave Anisotropy Probe first-year data that the PPS deviates from a Harrison-Zeldovich spectrum 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.},
doi = {10.1103/PhysRevD.72.103520},
journal = {Physical Review. D, Particles Fields},
number = 10,
volume = 72,
place = {United States},
year = {Tue Nov 15 00:00:00 EST 2005},
month = {Tue Nov 15 00:00:00 EST 2005}
}