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Title: The shape of the primordial power spectrum: A last stand before Planck data
Author: Hiranya, V.P.
Verde, Licia
Keywords: Espectroscòpia
Constants físiques
Spectrum analysis
Physical constants
Issue Date: 2010
Publisher: American Physical Society
Abstract: We present a minimally parametric reconstruction of the primordial power spectrum using the most recent cosmic microwave background and large-scale structure data sets. Our goal is to constrain the shape of the power spectrum while simultaneously avoiding strong theoretical priors and over-fitting of the data. We find no evidence for any departure from a power-law spectral index. We also find that an exact scale-invariant power spectrum is disfavored by the data, but this conclusion is weaker than the corresponding result assuming a theoretically-motivated power-law spectral index prior. The reconstruction shows that better data are crucial to justify the adoption of such a strong theoretical prior observationally. These results can be used to determine the robustness of our present knowledge when compared with forthcoming precision data from Planck.
Note: Reproducció del document publicat a:
It is part of: Physical Review D, 2010, vol. 81, num. 2, p. 021302-1-021302-5
ISSN: 1550-7998
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)
Publicacions de projectes de recerca finançats per la UE

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