Nonlocal dilaton coupling to dark matter: cosmic acceleration and pressure backreaction
A model of nonlocal dilaton interactions, motivated by string duality symmetries, is applied to a scenario of “coupled quintessence” in which the dilaton dark energy is nonlocally coupled to the dark-matter sources. It is shown that the nonlocal effects tend to generate a backreaction which—for stro...
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| Main Authors: | , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
20 June 2008
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| In: |
Physical review. D, Particles, fields, gravitation, and cosmology
Year: 2008, Volume: 77, Issue: 12, Pages: 12352 |
| ISSN: | 1550-2368 |
| DOI: | 10.1103/PhysRevD.77.123526 |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1103/PhysRevD.77.123526 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevD.77.123526 
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| Author Notes: | L. Amendola, M. Gasperini, and C. Ungarelli |
MARC
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| 520 | |a A model of nonlocal dilaton interactions, motivated by string duality symmetries, is applied to a scenario of “coupled quintessence” in which the dilaton dark energy is nonlocally coupled to the dark-matter sources. It is shown that the nonlocal 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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