Papers › Dark Energy from the Thermal Sunyaev Zeldovich Power Spectrum
Dark Energy from the Thermal Sunyaev Zeldovich Power Spectrum
Boris Bolliet, Barbara Comis, Eiichiro Komatsu, Juan Francisco Macías-Pérez
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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 marginalising 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 Ωₘ and σ₈). We find that the amplitude of the tSZ power spectrum at ℓ≲10³ depends primarily on F≡σ₈(Ωₘ/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\% precision, F=0.460±0.012 (68% 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 Ωₘ=0.265±0.022 (68% 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 Λ Cold Dark Matter (CDM) model, the mass bias of B=1.71±0.17, i.e., 1-b=0.58±0.06 (68% CL).
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