Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Decaying vacuum model

  1. Sep 14, 2012 #1


    User Avatar
    Gold Member

    What do you guys think of this new model?

    [4] arXiv:1209.2802 [pdf, ps, other]
    Expansion History with Decaying Vacuum: A Complete Cosmological ScenJ. A. S. Lima, S. Basilakos, Joan So
    Comments: LaTeX, 11 pages and one figure
    Subjects: General Relativity and Quantum Cosmology (gr-qc); Cosmology and Extragalactic Astrophysics (astro-ph.CO); High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Theory (hep-th)
    We propose a novel cosmological scenario with the space-time emerging from a pure initial de Sitter stage and subsequently evolving into the radiation, matter and dark energy dominated epochs, thereby avoiding the initial singularity and providing a complete description of the expansion history and a natural solution to the horizon problem. The model is based on a running vacuum energy density which evolves as a power series of the Hubble rate: \rho_{\Lambda}(H). The transit from the inflation into the standard radiation epoch is universal, giving a clue for a successful description of the graceful exit. The Universe is finally driven into the present slow accelerated expansion, characterized by a residual (but dynamical) vacuum energy: \rho_{\Lambda}(H)=c_0+c_2H^2. While the resulting late time cosmic history is very close to the concordance \Lambda CDM model, the new unified framework embodies a more complete past cosmic evolution than the standard cosmology
  2. jcsd
  3. Sep 15, 2012 #2
    It doesn't seem to be a new model so much as "curve fitting" but it looks like interesting and useful curve fitting.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook