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The emergence of a highly improbable coincidence in cosmological observationsspeaks to a remarkably simple cosmic expansion. Compelling evidence nowsuggests that the Universe's gravitational horizon, coincident with the betterknown Hubble sphere, has a radius improbably equal to the distance light couldhave travelled since the Big Bang. The confirmation of this unexpected resultwould undoubtedly herald the influence of new physics, yet appears to beunavoidable after a recent demonstration that theFriedmann-Lemaitre-Robertson-Walker metric is valid only for the so-called zeroactive mass equation of state. As it turns out, a cosmic fluid with thisproperty automatically produces the aforementioned equality, leaving littleroom for a cosmological constant. The alternative---a dynamical darkenergy---would suggest an extension to the standard model of particle physics,and a serious re-evaluation of the Universe's early history.

Tantalizing New Physics from the Cosmic Purview