Non-local dilaton coupling to dark matter: cosmic acceleration and pressure backreaction

Details Non-local dilaton coupling to dark matter: cosmic acceleration and pressure backreaction Non-local dilaton coupling to dark matter: cosmic acceleration and pressure backreaction

2007-11-30

arxiv.org/abs/0711.5022v1

Phys.Rev.D77:123526,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

11 pages, 1 figure eps

Scientific paper

10.1103/PhysRevD.77.123526

A model of non-local dilaton interactions, motivated by string duality symmetries, is applied to a scenario of "coupled quintessence" in which the dilaton dark energy is non-locally coupled to the dark-matter sources. It is shown that the non-local effects tend to generate a backreaction which -- for strong enough coupling -- can automatically compensate the acceleration due to the negative pressure of the dilaton potential, thus asymptotically restoring the standard (dust-dominated) decelerated regime. This result is illustrated by analytical computations and numerical examples.

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