3 research outputs found
A new search for features in the primordial power spectrum
We develop a new approach toward a high resolution non-parametric
reconstruction of the primordial power spectrum using WMAP cosmic microwave
background temperature anisotropies that we confront with SDSS large-scale
structure data in the range k~0.01-0.1 h/Mpc. We utilise the standard LambdaCDM
cosmological model but we allow the baryon fraction to vary. In particular, for
the concordance baryon fraction, we compare indications of a possible feature
at k~0.05 h/Mpc in WMAP data with suggestions of similar features in large
scale structure surveys.Comment: revised version, conclusions unchanged, 7 figures, accepted for
publication in MNRA
Primordial Power Spectrum Reconstruction
In order to reconstruct the initial conditions of the universe it is
important to devise a method that can efficiently constrain the shape of the
power spectrum of primordial matter density fluctuations in a model-independent
way from data. In an earlier paper we proposed a method based on the wavelet
expansion of the primordial power spectrum. The advantage of this method is
that the orthogonality and multiresolution properties of wavelet basis
functions enable information regarding the shape of to be
encoded in a small number of non-zero coefficients. Any deviation from
scale-invariance can then be easily picked out. Here we apply this method to
simulated data to demonstrate that it can accurately reconstruct an input
, and present a prescription for how this method should be used
on future data.Comment: 4 pages, 2 figures. JCAP accepted versio