Quintessence and the Separation of CMB Peaks
Abstract
A hypothetical dark energy component may have an equation of state that is different from a cosmological constant and possibly even changing in time. The spacing of the cosmic microwave background peaks is sensitive to the ratio of the horizon sizes today and at last scattering and therefore to the details of the cosmological evolution. We propose that it should in many cases be possible to discriminate between dark energy models with a different equation of state. In particular, accurate measurement of the spacing of the peaks could distinguish a cosmological constant from quintessence.Keywords
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