**Ekpyrotic and Cyclic Cosmology**

by Jean-Luc Lehners

**Publisher**: arXiv 2009**Number of pages**: 79

**Description**:

Ekpyrotic and cyclic cosmologies provide theories of the very early and of the very late universe. In these models, the big bang is described as a collision of branes - and thus the big bang is not the beginning of time. Before the big bang, there is an ekpyrotic phase with equation of state w=P/rho >> 1 during which the universe slowly contracts.

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