2006/11/30 by B. Guberina, B Guberina, R. Horvat +3 · 3 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology #Cosmology and Gravitation Theories #Cutoff #Dark Matter and Cosmic Phenomena #Dark energy #Dark fluid #Dark matter #Holography #Hubble's law #astro-ph #gr-qc #hep-th
paper · pdf · doi:10.1088/1475-7516/2007/01/012
published as JCAP 0701:012,2007 · 9 pages, minor revision, to appear in JCAP
arxiv created 2007/01/03 · openalex publication_date 2007/01/11 · arxiv updated 2014/10/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
It has been well established that holographic dark energy (HDE) is a serious candidate for being the dark energy of the universe. Here we deal with models where the holographic bound for dark energy is not saturated for a large portion of the history of the universe. This is particularly compelling when the IR cut-off is set by the Hubble scale, since otherwise a transition from a decelerated to an accelerated era cannot be obtained for a spatially flat universe. We demonstrate using three generic but disparate dynamical models, two of them containing a variable Newton constant, that a transition between the two eras is always obtained for the IR cut-off in the form of the Hubble scale and the non-saturated HDE. We also give arguments for why such a choice for the dark energy is more consistent and favoured over the widely accepted saturated form.