Back-Reaction: A Cosmological Panacea

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dc.creatorMartineau, P.
dc.creatorBrandenberger, R.
dc.date2005-10-18
dc.date.accessioned2026-07-07T06:43:56Z
dc.date.available2026-07-07T06:43:56Z
dc.descriptionWe present a solution to the dark energy problem in terms of the Effective Energy Momentum Tensor (EMT) of cosmological perturbations. The approach makes use of the gravitational back-reaction of long wavelength (super-Hubble) fluctuation modes on the background metric. Our results indicate that, following preheating, the energy density associated with back-reaction is sub-dominant and behaves as a tracker during the radiation era. At the onset of matter domination, however, the effects of back-reaction begin to grow relative to the matter density and the associated equation of state quickly approaches that of a cosmological constant. Using standard values for the preheating temperature and the amplitude of the inflaton following preheating, we show that this mechanism leads to a very natural explanation of dark energy. We comment on other recent attempts to explain the dark energy using back-reaction and their relation to our work.
dc.description6 pages
dc.identifierhttps://arxiv.org/abs/astro-ph/0510523
dc.identifierhttp://arxiv.org/abs/astro-ph/0510523
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/102605
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Theory
dc.titleBack-Reaction: A Cosmological Panacea
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