caa a22 4500 445385847 CHVBK 20180317143032.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s10714-011-1153-2 doi (NATIONALLICENCE)springer-10.1007/s10714-011-1153-2 Bauer Florian High Energy Physics Group, Department of ECM, and Institut de Ciències del Cosmos, Universitat de Barcelona, Av. Diagonal 647, 08028, Barcelona, Catalonia, Spain aut Filtering out the cosmological constant in the Palatini formalism of modified gravity [Elektronische Daten] [Florian Bauer] 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. Springer Science+Business Media, LLC, 2011 Cosmological constant nationallicence Modified gravity nationallicence Palatini formalism nationallicence Dark energy nationallicence Vacuum energy nationallicence General Relativity and Gravitation Springer US; http://www.springer-ny.com 43/6(2011-06-01), 1733-1757 0001-7701 43:6<1733 2011 43 10714 https://doi.org/10.1007/s10714-011-1153-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10714-011-1153-2 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Bauer Florian High Energy Physics Group, Department of ECM, and Institut de Ciències del Cosmos, Universitat de Barcelona, Av. Diagonal 647, 08028, Barcelona, Catalonia, Spain aut NATIONALLICENCE 773 0- General Relativity and Gravitation Springer US; http://www.springer-ny.com 43/6(2011-06-01), 1733-1757 0001-7701 43:6<1733 2011 43 10714 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer