2010/07/31 by F. Bauer, Florian Bauer · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #astro-ph.CO #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.1007/s10714-011-1153-2
published as Gen.Rel.Grav.43:1733-1757,2011 · 22 pages, 1 figure, discussion extended, references added, accepted by Gen.Rel.Grav
arxiv created 2011/01/20 · openalex publication_date 2011/02/05 · arxiv updated 2011/05/10 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/29
According to theoretical physics the cosmological constant (CC) is expected to be much larger in magnitude than other energy densities in the universe, which is in stark contrast to the observed Big Bang evolution. We address this old CC problem not by introducing an extremely fine-tuned counterterm, but in the context of modified gravity in the Palatini formalism. In our model the large CC term is filtered out, and it does not prevent a standard cosmological evolution. We discuss the filter effect in the epochs of radiation and matter domination as well as in the asymptotic de Sitter future. The final expansion rate can be much lower than inferred from the large CC without using a fine-tuned counterterm. Finally, we show that the CC filter works also in the Kottler (Schwarzschild-de Sitter) metric describing a black hole environment with a CC compatible to the future de Sitter cosmos.