Fundamental Physics from Future Weak-Lensing Calibrated Sunyaev-Zel'dovich Galaxy Cluster Counts

Abstract

Future high-resolution measurements of the cosmic microwave background (CMB) will produce catalogs of tens of thousands of galaxy clusters through the thermal Sunyaev-Zel'dovich (tSZ) effect. We forecast how well different configurations of a CMB Stage-4 experiment can constrain cosmological parameters, in particular the amplitude of structure as a function of redshift ${\sigma }_8(z)$, the sum of neutrino masses $\Sigma m_{\nu }$, and the dark energy equation of state $w(z)$. A key element of this effort is calibrating the tSZ scaling relation by measuring the lensing signal around clusters. We examine how the mass calibration from future optical surveys like the Large Synoptic Survey (LSST) compares with a purely internal calibration using lensing of the CMB itself. We find that, due to its high-redshift leverage, internal calibration gives constraints on cosmological parameters comparable to the optical calibration, and can be used as a cross-check of systematics in the optical measurement. We also show that in contrast to the constraints using the CMB lensing power spectrum, lensing-calibrated tSZ cluster counts can detect a minimal $\Sigma m_{\nu }$ at the 3-5$\sigma$ level even when the dark energy equation of state is freed up.

Updated to match version published in PRD. 15 pages, 9 figures. Fig 8 right panel is partially obscured in published proof; it is fine in the arXiv version

References in corpus (8)

• Weighing the Giants IV: Cosmology and Neutrino Mass
• Cosmology and Astrophysics from Relaxed Galaxy Clusters II: Cosmological Constraints
• Density profiles of galaxy groups and clusters from SDSS galaxy-galaxy weak lensing
• Catalog Extraction in SZ Cluster Surveys: a matched filter approach
• Analytic models of plausible gravitational lens potentials
• Evidence of Lensing of the Cosmic Microwave Background by Dark Matter Halos
• A Measurement of Gravitational Lensing of the Cosmic Microwave Background by Galaxy Clusters Using Data from the South Pole Telescope
• Calibrating Cluster Number Counts with CMB lensing

Cited by in corpus (9)

• CMB-S4 Science Case, Reference Design, and Project Plan
• The galaxy cluster mass scale and its impact on cosmological constraints from the cluster population
• Neutrino Mass from Cosmology: Probing Physics Beyond the Standard Model
• Cosmology with the moving lens effect
• Assessing the Importance of Noise from Thermal Sunyaev-Zel{'}dovich Signals for CMB Cluster Surveys and Cluster Cosmology
• The Atacama Cosmology Telescope: Weighing distant clusters with the most ancient light
• Probing Cosmology and Cluster Astrophysics with Multi-Wavelength Surveys I. Correlation Statistics
• Tidal virialization of dark matter haloes with clustering dark energy
• Cosmological Implications of a Neutrino Mass Detection