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Detection of Hot Gas in Galaxy Groups via the Sunyaev-Zel'dovich Effect
K. Moodley, R. Warne, N. Goheer +1
Motivated by the observed shortfall of baryons in the local universe, we investigate the ability of high resolution cosmic microwave background (CMB) experiments to detect hot gas…
Covariance of dark energy parameters and sound speed constraints from large HI surveys
A. Torres-Rodriguez, C. M. Cress, K. Moodley
An interesting probe of the nature of dark energy is the measure of its sound speed, . We review the significance for constraining sound speed models of dark energy using larg…
Measuring the geometry of the Universe in the presence of isocurvature modes
J. Dunkley, M. Bucher, P. G. Ferreira +2
The Cosmic Microwave Background (CMB) anisotropy constrains the geometry of the Universe because the positions of the acoustic peaks of the angular power spectrum depend strongly o…
Constraints on isocurvature models from the WMAP first-year data
K. Moodley, M. Bucher, J. Dunkley +2
We investigate the constraints imposed by the first-year WMAP CMB data extended to higher multipole by data from ACBAR, BOOMERANG, CBI and the VSA and by the LSS data from the 2dF…
Fast and reliable MCMC for cosmological parameter estimation
Joanna Dunkley, Martin Bucher, Pedro G. Ferreira +2
Markov Chain Monte Carlo (MCMC) techniques are now widely used for cosmological parameter estimation. Chains are generated to sample the posterior probability distribution obtained…
The initial conditions of the universe: how much isocurvature is allowed?
M. Bucher, J. Dunkley, P. G. Ferreira +2
We investigate the constraints imposed by the current data on correlated mixtures of adiabatic and non-adiabatic primordial perturbations. We discover subtle flat directions in par…