Dark energy constraints from the thermal Sunyaev--Zeldovich power spectrum.

We constrain the dark energy equation of state parameter, w, using the power spectrum of the thermal Sunyaev--Zeldovich (tSZ) effect. We improve upon previous analyses by taking into account the trispectrum in the covariance matrix and marginalizing over the foreground parameters, the correlated noise, the mass bias B in the Planck universal pressure profile, and all the relevant cosmological parameters (i.e. not just ω_m and σ₈). We find that the amplitude of the tSZ power spectrum at l ... < 10³ depends primarily on F ≡ σ8 (ω_m/B)^0.40 h-^0.21, where B is related to more commonly used variable b by B = (1 - b)^-1. We measure this parameter with 2.6 per cent precision, F = 0.460 ± 0.012 (68 per cent CL). By fixing the bias to B = 1.25 and adding the local determination of the Hubble constant H0 and the amplitude of the primordial power spectrum constrained by the Planck cosmic microwave background (CMB) data, we find w = -1.10 ± 0.12, σ₈ = 0.802 ± 0.037, and ω_m = 0.265 ± 0.022 (68 per cent CL). Our limit on w is consistent with and is as tight as that from the distance-alone constraint from the CMB and H0. Finally, by combining the tSZ power spectrum and the CMB data we find, in the ξ cold dark matter model, the mass bias of B = 1.71 ± 0.17, i.e. 1 - b = 0.58 ± 0.06 (68 per cent CL). [ABSTRACT FROM AUTHOR]