Gravitational Coupling and Dynamical Reduction of The Cosmological Constant

Abstract

We introduce a dynamical model to reduce a large cosmological constant to a sufficiently small value. The basic ingredient in this model is a distinction which has been made between the two unit systems used in cosmology and particle physics. We have used a conformal invariant gravitational model to define a particular conformal frame in terms of large scale properties of the universe. It is then argued that the contributions of mass scales in particle physics to the vacuum energy density should be considered in a different conformal frame. In this manner, a decaying mechanism is presented in which the conformal factor appears as a dynamical field and plays a key role to relax a large effective cosmological constant. Moreover, we argue that this model also provides a possible explanation for the coincidence problem.

To appear in GRG

References in corpus (3)

• Cosmological Evolution of a Quintom Model of Dark Energy
• Cosmological viability of f(R)-gravity as an ideal fluid and its compatibility with a matter dominated phase
• Dark Energy: the equation of state description versus scalar-tensor or modified gravity

Cited by in corpus (9)

• Coincidence Problem in $f(R)$ Gravity Models
• Stress-Energy Connection and Cosmological Constant Problem
• Cosmic Acceleration in Brans-Dicke Cosmology
• Towards a possible solution for the coincidence problem: f(G) gravity as background
• Coincidence Problem in f(T) Gravity Models
• Deflation of Vacuum Energy During Inflation Due to Bulk-Brane Interaction
• Gravitational Coupling, Dynamical Changes of Units and The Cosmological Constant Problem
• Scale transformation, modified gravity, and Brans-Dicke theory
• The Coincidence Problem in Holographic f(R) Gravity