2009/03/31 by Daniel Phillips, Daniel R. Phillips, Andreas Albrecht · 2 citations
Mathematics · Physics and Astronomy · #Astrophysics #Black Holes and Theoretical Physics #Computer science #Cosmology #Cosmology and Gravitation Theories #Entropy (arrow of time) #Galaxies: Formation, Evolution, Phenomena #Homogeneous #Isotropy #Lambda #Mathematics #Physics #Quantum mechanics #Statistical physics #Theoretical physics #Thermodynamics #Universe #Weighting #gr-qc
paper · pdf · doi:10.1103/physrevd.84.123530
published as Phys. Rev. D 84, 123530 (2011) · 9 pages, 5 figures. V2: appearing in Phys Rev. D, including additional discussion of generic late-time entropy sources and a more general calculation of their effects on the prediction for Λ, along with an updated figure
openalex publication_date 2011/12/30 · arxiv created 2012/01/19 · arxiv updated 2012/01/20 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The causal entropic principle aims to predict the unexpectedly small value of the cosmological constant \ensuremathΛ using a weighting by entropy increase on causal diamonds. The original work assumed a purely isotropic and homogeneous cosmology. But even the level of inhomogeneity observed in our universe forces reconsideration of certain arguments about entropy production. In particular, we must consider an ensemble of causal diamonds associated with each background cosmology and we can no longer immediately discard entropy production in the far future of the universe. Depending on our choices for a probability measure and our treatment of black hole evaporation, the prediction for \ensuremathΛ may be left intact or dramatically altered.