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Journal Article

Cosmic Bounces and Cyclic Universes

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Lehners,  Jean-Luc
Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, Golm, DE;

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1106.0172
(Preprint), 317KB

CQG_28_20_204004.pdf
(Any fulltext), 368KB

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Citation

Lehners, J.-L. (2011). Cosmic Bounces and Cyclic Universes. Classical and quantum gravity, 28(20): 204004. doi:10.1088/0264-9381/28/20/204004.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0012-0697-0
Abstract
Cosmological models involving a bounce from a contracting to an expanding universe can address the standard cosmological puzzles and generate "primordial" density perturbations without the need for inflation. Some such models, in particular the ekpyrotic and cyclic models that we focus on, fit rather naturally into string theory. We discuss a number of topics related to these models: the reasoning that leads to the ekpyrotic phase, the predictions for upcoming observations, the differences between singular and non-singular models of the bounce as well as the predictive and explanatory power offered by these models.