Phantom energy mediates a long-range repulsive force

• Verfasst von: Amendola, Luca [VerfasserIn]
• Titel: Phantom energy mediates a long-range repulsive force
• Verf.angabe: Luca Amendola, INAF/Osservatorio Astronomico di Roma, Viale Frascati 33, 00040 Monteporzio Catone, Roma, Italy
• Fussnoten: Gesehen am 16.11.2017
• Titel Quelle: Enthalten in: Physical review letters
• Jahr Quelle: 2004
• Band/Heft Quelle: 93(2004,18) Artikel-Nummer 181102, 4 Seiten
• ISSN Quelle: 1079-7114
• DOI: doi:10.1103/PhysRevLett.93.181102
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1565419804

Abstract

Scalar field models with nonstandard kinetic terms have been proposed in the context of k inflation, of Born-Infeld Lagrangians, of phantom energy and, more in general, of low-energy string theory. In general, scalar fields are expected to couple to matter inducing a new interaction. In this Letter I derive the cosmological perturbation equations and the Yukawa correction to gravity for such general models. I find three interesting results: first, when the field behaves as phantom energy (equation of state less than −1), then the coupling strength is negative, inducing a long-range repulsive force; second, the dark-energy field might cluster on astrophysical scales; third, applying the formalism to a Brans-Dicke theory with a general kinetic term it is shown that its Newtonian effects depend on a single parameter that generalizes the Brans-Dicke constant.