Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2009-05-11
Astron.Astrophys.508:45M,2009
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
7 pages, 5 figures, 1 table, replaced to match version accepted by A&A
Scientific paper
10.1051/0004-6361/200912451
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.
Maturi Matteo
Mignone Claudia
No associations
LandOfFree
An optimal basis system for cosmology: data analysis and new parameterisation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with An optimal basis system for cosmology: data analysis and new parameterisation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and An optimal basis system for cosmology: data analysis and new parameterisation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-701209