Dynamical Relaxation of Dark Energy: A Solution to Early Inflation, Late-time Acceleration and the Cosmological Constant Problem

Abstract

In recent years different explanations are provided for both an inflation and a recent acceleration in the expansion of the universe. In this Letter we show that a model of physical interest is the modification of general relativity with a Gauss-Bonnet term coupled to a dynamical scalar-field as predicted by certain versions of string theory. This construction provides a model of evolving dark energy that naturally explains a dynamical relaxation of the vacuum energy (gravitationally repulsive potential) to a small value (exponentially close to zero) after a sufficient number of e-folds. The model also leads to a small deviation from the $w=-1$ prediction of non-evolving dark energy.

6 pages, 3 figures, version in PLB

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• Holographic modified gravity
• Late acceleration and $w=-1$ crossing in induced gravity
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• Coupled Quintessence and Phantom Based On a Dilaton
• Reconstruction of f(T) gravity according to holographic dark energy
• New Agegraphic Dark Energy in $f(R)$ Gravity
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• A Note on the Viability of Gauss-Bonnet Cosmology
• Reconstructing a model of quintessential inflation
• Statistical Approach to the Cosmological-Constant Problem on Brane Worlds
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