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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 448215.0, MPI für Astronomie / Publikationen_mpia
An optimal basis system for cosmology: data analysis and new parameterisation
Authors:Maturi, M.; Mignone, C.
Language:English
Date of Publication (YYYY-MM-DD):2009
Title of Journal:Astronomy and Astrophysics
Journal Abbrev.:A & A
Volume:508
Issue / Number:1
Start Page:45
End Page:51
Review Status:not specified
Audience:Experts Only
Abstract / Description:We define an optimal basis system into which cosmological observables can be decomposed. The basis system can be optimised for a specific cosmological model or for an ensemble of models, even if based on drastically different physical assumptions. The projection coefficients derived from this basis system, the so-called features, provide a common parameterisation for studying and comparing different cosmological models independently of their physical construction. They can be used to directly compare different cosmologies and study their degeneracies in terms of a simple metric separation. This is a very convenient approach, since only very few realisations have to be computed, in contrast to Markov-Chain Monte Carlo methods. Finally, the proposed basis system can be applied to reconstruct the Hubble expansion rate from supernova luminosity distance data with the advantage of being sensitive to possible unexpected features in the data set. We test the method both on mock catalogues and on the SuperNova Legacy Survey data set.
Free Keywords:cosmology: cosmological parameters; methods: data analysis
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2009A%26A...508...45... [ID No:1]
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