Ruiz Cembranos, José AlbertoCruz Dombriz, Álvaro de laMontes Núñez, Bárbara2023-06-202023-06-202012-041475-751610.1088/1475-7516/2012/04/021https://hdl.handle.net/20.500.14352/44913© 2012 IOP Publishing Ltd and Sissa Medialab srl. This work has been supported by MICINN (Spain) project number FPA 2008-00592 and Consolider-Ingenio MULTIDARK CSD2009-00064. AdlCD also acknowledges financial support from NRF and URC research fellowships (South Africa) and kind hospitality of UCM, Madrid while elaborating part of the manuscript.We study the gravitational collapse in modified gravitational theories. In particular, we analyze a general f(R) model with uniformly collapsing cloud of self-gravitating dust particles. This analysis shares analogies with the formation of large-scale structures in the early Universe and with the formation of stars in a molecular cloud experiencing gravitational collapse. In the same way, this investigation can be used as a first approximation to the modification that stellar objects can suffer in these modified theories of gravity. We study concrete examples, and find that the analysis of gravitational collapse is an important tool to constrain models that present late-time cosmological acceleration.engjournal articlehttp://dx.doi.org/10.1088/1475-7516/2012/04/021http://arxiv.org/abs/1201.1289http://iopscience.iop.org/open access53Greater-than 1Cosmological constantModified gravityDark energyGalaxy clusterUniverseMatterBraneSingularityTelescopeFísica (Física)22 Física