Detecting Dark Energy in Orbit -- the Cosmological Chameleon

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dc.creatorBrax, Philippe
dc.creatorvan de Bruck, Carsten
dc.creatorDavis, Anne-Christine
dc.creatorKhoury, Justin
dc.creatorWeltman, Amanda
dc.date2004-08-23
dc.date2005-01-14
dc.date.accessioned2026-07-07T10:47:54Z
dc.date.available2026-07-07T10:47:54Z
dc.descriptionWe show that the chameleon scalar field can drive the current phase of cosmic acceleration for a large class of scalar potentials that are also consistent with local tests of gravity. These provide explicit realizations of a quintessence model where the quintessence scalar field couples directly to baryons and dark matter with gravitational strength. We analyze the cosmological evolution of the chameleon field and show the existence of an attractor solution with the chameleon following the minimum of its effective potential. For a wide range of initial conditions, spanning many orders of magnitude in initial chameleon energy density, the attractor is reached before nucleosynthesis. Surprisingly, the range of allowed initial conditions leading to a successful cosmology is wider than in normal quintessence. We discuss applications to the cyclic model of the universe and show how the chameleon mechanism weakens some of the constraints on cyclic potentials.
dc.description31 pages, 6 figures. v2: Minor corrections, added references, version published in PRD
dc.identifierhttps://arxiv.org/abs/astro-ph/0408415
dc.identifierhttp://arxiv.org/abs/astro-ph/0408415
dc.identifierPhys.Rev.D70:123518,2004
dc.identifierdoi:10.1103/PhysRevD.70.123518
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/183695
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Theory
dc.titleDetecting Dark Energy in Orbit -- the Cosmological Chameleon
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