Nonlocal dilaton coupling to dark matter

• Verfasst von: Amendola, Luca [VerfasserIn]
• Verfasst von: Gasperini, Maurizio [VerfasserIn]
• Verfasst von: Ungarelli, Carlo [VerfasserIn]
• Titel: Nonlocal dilaton coupling to dark matter
• Titelzusatz: cosmic acceleration and pressure backreaction
• Verf.angabe: L. Amendola, M. Gasperini, and C. Ungarelli
• Fussnoten: Gesehen am 15.11.2017
• Titel Quelle: Enthalten in: Physical review / D
• Jahr Quelle: 2008
• Band/Heft Quelle: 77(2008,12) Artikel-Nummer 12352, 8 Seiten
• ISSN Quelle: 1550-2368
• ISSN Quelle: 1089-4918
• DOI: doi:10.1103/PhysRevD.77.123526
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1565359143

Abstract

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.