2004/09/30 by Luca Amendola · 3 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Brans–Dicke theory #Classical mechanics #Cosmology #Cosmology and Gravitation Theories #Coupling constant #Dark energy #Formalism (music) #Imaging phantom #Kinetic energy #Kinetic term #Mathematical physics #Physics #Quantum electrodynamics #Quantum mechanics #Relativity and Gravitational Theory #Scalar field #Yukawa potential #astro-ph #gr-qc #hep-th
paper · pdf · doi:10.1103/physrevlett.93.181102
published as Phys.Rev.Lett. 93 (2004) 181102 · 5 pages; accepted on Phys. Rev. Lett. v2: two references added
arxiv created 2004/10/14 · openalex publication_date 2004/10/29 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.