Quintessence, the Gravitational Constant, and Gravity

Details Quintessence, the Gravitational Constant, and Gravity Quintessence, the Gravitational Constant, and Gravity

1999-03-25

arxiv.org/abs/gr-qc/9903094v3

Phys.Rev. D60 (1999) 083508

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

9 pages, a version to be published in Phys.Rev.D

Scientific paper

10.1103/PhysRevD.60.083508

Dynamical vacuum energy or quintessence, a slowly varying and spatially inhomogeneous component of the energy density with negative pressure, is currently consistent with the observational data. One potential difficulty with the idea of quintessence is that couplings to ordinary matter should be strongly suppressed so as not to lead to observable time variations of the constants of nature. We further explore the possibility of an explicit coupling between the quintessence field and the curvature. Since such a scalar field gives rise to another gravity force of long range ($\simg H^{-1}_0$), the solar system experiments put a constraint on the non-minimal coupling: $|\xi| \siml 10^{-2}$.

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