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Gravitational collapse in f(R) theories

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Ruiz Cembranos, José Alberto and Cruz Dombriz, Álvaro de la and Montes Núñez, Bárbara (2012) Gravitational collapse in f(R) theories. Journal of cosmology and astroparticle physics . ISSN 1475-7516

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Official URL: http://dx.doi.org/10.1088/1475-7516/2012/04/021




Abstract

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.


Item Type:Article
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© 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.

Uncontrolled Keywords:Greater-than 1; Cosmological constant; Modified gravity; Dark energy; Galaxy cluster; Universe; Matter; Brane; Singularity; Telescope
Subjects:Sciences > Physics
ID Code:35811
Deposited On:22 Feb 2016 14:57
Last Modified:22 Feb 2016 14:57

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