First results from the Very Small Array -- IV. Cosmological parameter estimation

Abstract

We investigate the constraints on basic cosmological parameters set by the first compact-configuration observations of the Very Small Array (VSA), and other cosmological data sets, in the standard inflationary LambdaCDM model. Using a weak prior 40 < H_0 < 90 km/s/Mpc and 0 < tau < 0.5 we find that the VSA and COBE_DMR data alone produce the constraints Omega_tot = 1.03^{+0.12}_{-0.12}, Omega_bh^2 = 0.029^{+0.009}_{-0.009}, Omega_cdm h^2 = 0.13^{+0.08}_{-0.05} and n_s = 1.04^{+0.11}_{-0.08} at the 68 per cent confidence level. Adding in the type Ia supernovae constraints, we additionally find Omega_m = 0.32^{+0.09}_{-0.06} and Omega_Lambda = 0.71^{+0.07}_{-0.07}. These constraints are consistent with those found by the BOOMERanG, DASI and MAXIMA experiments. We also find that, by combining all the recent CMB experiments and assuming the HST key project limits for H_0 (for which the X-ray plus Sunyaev--Zel'dovich route gives a similar result), we obtain the tight constraints Omega_m=0.28^{+0.14}_{-0.07} and Omega_Lambda= 0.72^{+0.07}_{-0.13}, which are consistent with, but independent of, those obtained using the supernovae data.

10 pages, 6 figures, MNRAS in press

References in corpus (16)

• Cosmological parameters from CMB and other data: a Monte-Carlo approach
• Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant
• A measurement by BOOMERANG of multiple peaks in the angular power spectrum of the cosmic microwave background
• DASI First Results: A Measurement of the Cosmic Microwave Background Angular Power Spectrum
• A High Spatial Resolution Analysis of the MAXIMA-1 Cosmic Microwave Background Anisotropy Data
• Multiple Peaks in the Angular Power Spectrum of the Cosmic Microwave Background: Significance and Consequences for Cosmology
• Cosmological Parameter Extraction from the First Season of Observations with DASI
• Evidence for a non-zero Lambda and a low matter density from a combined analysis of the 2dF Galaxy Redshift Survey and Cosmic Microwave Background Anisotropies
• Cosmological implications of the MAXIMA-I high resolution Cosmic Microwave Background anisotropy measurement
• The Age of the Universe and the Cosmological Constant Determined from Cosmic Microwave Background Anisotropy Measurements
• First results from the Very Small Array -- III. The CMB power spectrum
• Analytic marginalization over CMB calibration and beam uncertainty
• First results from the Very Small Array -- I. Observational methods
• Maximum-likelihood estimation of the CMB power spectrum from interferometer observations
• First results from the Very Small Array -- II. Observations of the CMB
• Cosmology from Cosmic Microwave Background and Galaxy Clusters

Cited by in corpus (43)

• Bayes in the sky: Bayesian inference and model selection in cosmology
• The evolution of CMB spectral distortions in the early Universe
• Updated Nucleosynthesis Constraints on Unstable Relic Particles
• Towards Cosmological Concordance on Galactic Scales
• Application of Monte Carlo Algorithms to the Bayesian Analysis of the Cosmic Microwave Background
• WMAPping inflationary physics
• First Detection of Polarization of the Submillimetre Diffuse Galactic Dust Emission by Archeops
• Cosmological parameter estimation using Very Small Array data out to l=1500
• First results from the Very Small Array -- III. The CMB power spectrum
• Prospects for Measuring Cosmic Microwave Background Spectral Distortions in the Presence of Foregrounds
• Discovering anomaly-mediated supersymmetry at the LHC
• First results from the Very Small Array -- I. Observational methods
• Neutrino mass limits from SDSS, 2dFGRS and WMAP
• BayesCLUMPY: Bayesian Inference with Clumpy Dusty Torus Models
• The last stand before MAP: cosmological parameters from lensing, CMB and galaxy clustering
• Bayesian inference on compact binary inspiral gravitational radiation signals in interferometric data
• The CMB temperature power spectrum from an improved analysis of the Archeops data
• Cosmological parameter estimation and Bayesian model comparison using VSA data
• First results from the Very Small Array -- II. Observations of the CMB
• What can be learned from the lensed cosmic microwave background B-mode polarization power spectrum?
• Using a phenomenological model to test the coincidence problem of dark energy
• Extremely fast orbital decay of the black hole X-ray binary Nova Muscae 1991
• Varying fundamental constants principal component analysis: additional hints about the Hubble tension
• Very Small Array observations of the Sunyaev-Zel'dovich effect in nearby galaxy clusters
• Direct Wavelet Expansion of the Primordial Power Spectrum
• Wavelet Band Powers of the Primordial Power Spectrum from CMB Data
• MAXIMA: A Balloon-Borne Cosmic Microwave Background Anisotropy Experiment
• Blind component separation for polarized observations of the CMB
• TASI Lectures on AstroParticle Physics
• Non-Gaussianity in the Very Small Array CMB maps with Smooth-Goodness-of-fit tests
• Searching for non-Gaussianity in the VSA data
• News on Leptogenesis
• Virialization of matter overdensities within dark energy subsystems: special cases
• Spectral Indications of thermal Sunyaev-Zel'dovich Effect in Archeops and WMAP Data
• CMB observations from the CBI and VSA: A comparison of coincident maps and parameter estimation methods
• Modeling dark energy through an Ising fluid with network interactions
• 20+ years of Inflation
• Caching and Interpolated Likelihoods: Accelerating Cosmological Monte Carlo Markov Chains
• Goodness--of--fit Statistics and CMB Data Sets
• Observing the CMB at High-l using the VSA and AMI
• A necessary condition for best fitting analytical to simulated density profiles in dark matter haloes
• Bayesian Inversion of Stokes Profiles
• Spin-Torsion, Braneworlds and Changing Symmetry in the Universe