Dark Energy in Light of the Cosmic Horizon
Fulvio Melia

TL;DR
This paper argues that the existence of a cosmological constant is inconsistent with observations and proposes dynamical dark energy models that better explain the universe's expansion, horizon, and age, addressing several cosmological problems.
Contribution
It demonstrates that a cosmological constant cannot explain current data and introduces dynamical dark energy models aligning with the cosmic horizon and universe's age.
Findings
Cosmological constant is untenable based on horizon analysis.
Dynamical dark energy models fit supernova data and resolve cosmological problems.
Proposes an older universe (~16.9 billion years) consistent with observations.
Abstract
Based on dramatic observations of the CMB with WMAP and of Type Ia supernovae with the Hubble Space Telescope and ground-based facilities, it is now generally believed that the Universe's expansion is accelerating. Within the context of standard cosmology, the Universe must therefore contain a third `dark' component of energy, beyond matter and radiation. However, the current data are still deemed insufficient to distinguish between an evolving dark energy component and the simplest model of a time-independent cosmological constant. In this paper, we examine the role played by our cosmic horizon R0 in our interrogation of the data, and reach the rather firm conclusion that the existence of a cosmological constant is untenable. The observations are telling us that R0=c t0, where t0 is the perceived current age of the Universe, yet a cosmological constant would drive R0 towards ct (where…
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Taxonomy
TopicsCosmology and Gravitation Theories · Dark Matter and Cosmic Phenomena · Galaxies: Formation, Evolution, Phenomena
