Constraints on the dark energy equation of state from the imprint of baryons on the power spectrum of clusters

• Main Authors: Angulo, R., Baugh, C. M., Frenk, C. S., Bower, R. G., Jenkins, A., Morris, S. L.
• Format: Text
• Language: unknown
• Published: arXiv 2005
• Subjects: Astrophysics astro-ph; FOS Physical sciences; South Pole; Hubble; South pole
• Online Access: https://dx.doi.org/10.48550/arxiv.astro-ph/0504456; https://arxiv.org/abs/astro-ph/0504456

Acoustic oscillations in the baryon-photon fluid leave a signature in the matter power spectrum. The overall shape of the spectrum and the wavelength of the oscillations depend upon the sound horizon scale at recombination. Using the $Λ$ cold dark matter Hubble Volume simulation, we show that the imprint of baryons is visible in the power spectrum of cluster-mass dark matter haloes, in spite of significant differences between the halo power spectrum and the prediction of linear perturbation theory. A measurement of the sound horizon scale can constrain the dark energy equation of state. We show that a survey of clusters at intermediate redshift ($ z\sim1 $), like the Sunyaev-Zeldovich survey proposed by the South Pole Telescope or a red sequence photometric survey with VISTA, could potentially constrain the sound horizon scale to an accuracy of $\sim 2%$, in turn fixing the ratio of the pressure of the dark energy to its density ($w$) to better than $\sim 10%$. Our approach does not require knowledge of the cluster mass, unlike those that depend upon the abundance of clusters. : accepted by MNRAS; colour versions of plots included