Beyond LCDM: Bits join the Dark Side

Abstract

We are encouraged to look beyond LambdaCDM as there are no satisfactory explanations for dark energy or dark matter. An evidence based approach applies two foundational principles of information theory to show dark energy and dark matter may be Holographic Dark Information Energy, HDIE. HDIE explains many effects attributed separately to Lambda and CDM. HDIE mimics Lambda with sufficient energy and an equation of state parameter, w= -1.03+-0.05 at redshifts z<1.35 to account for accelerating expansion. HDIE is clumped around galaxies at densities that distort space-time, explaining many CDM attributed effects. The present ratio of HDIE:baryons ~2.15, required for observed expansion history, is equivalent to a dark matter fraction ~68%, consistent with several galaxy surveys. The HDIE/baryon model is based largely on proven physics, provides a common explanation for dark energy and dark matter, and solves the cosmological coincidence problem. At earlier times, z > ~1.35, HDIE was phantom, w = -1.82+-0.08, enabling the model to be falsified. HDIE fits Planck dark energy wo-wa plots at least as well as Lambda, and is consistent with other results that suggest dark energy was phantom at earlier times. A new w-parameterisation is proposed, as the usual CPL parameterisation is unsuitable for distinguishing between HDIE/baryon and LambdaCDM models.

23 pages, 4 figures, 2 tables

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