A solution of the dark energy and its coincidence problem based on local antigravity sources without fine-tuning or new scales

Abstract

A novel idea is proposed for a natural solution of the dark energy and its cosmic coincidence problem. The existence of local antigravity sources, associated with astrophysical matter configurations distributed throughout the universe, can lead to a recent cosmic acceleration effect. Various physical theories can be compatible with this idea, but here, in order to test our proposal, we focus on quantum originated spherically symmetric metrics matched with the cosmological evolution through the simplest Swiss cheese model. In the context of asymptotically safe gravity, we have explained the observed amount of dark energy using Newton's constant, the galaxy or cluster length scales, and dimensionless order one parameters predicted by the theory, without fine-tuning or extra unproven energy scales. The interior modified Schwarzschild-de Sitter metric allows us to approximately interpret this result as that the standard cosmological constant is a composite quantity made of the above parameters, instead of a fundamental one.

34 pages, 2 figures, version to app. in Phys. Rev. D

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• Observational constraints of a new unified dark fluid and the $H_0$ tension
• Constraining the Asymptotically Safe Cosmology: cosmic acceleration without dark energy
• Swiss-cheese cosmologies with variable $G$ and $\Lambda$ from the renormalization group
• IR quantum gravity solves naturally cosmic acceleration and its coincidence problem
• Electroweak baryogenesis by primordial black holes in Brans-Dicke modified gravity
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• CPTM symmetry, closed time paths and cosmological constant problem in the formalism of extended manifold
• Evolution of spherical overdensity in Chaplygin gas model
• Renormalization-Group Running Induced Cosmic Inflation
• Constraining the swiss-cheese IR-fixed point cosmology with cosmic expansion
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• Primordial black hole driven cosmic acceleration
• Asymptotic Safety and the Cosmic Coincidence Problem
• Renormalization group approaches to Quantum Gravity and Tensions in Modern Cosmology