Dark Energy and the Return of the Phoenix Universe

  title={Dark Energy and the Return of the Phoenix Universe},
  author={Jean-Luc Lehners and Paul J. Steinhardt}
In cyclic universe models based on a single scalar field (e.g., the radion determining the distance between branes in M-theory), virtually the entire universe makes it through the ekpyrotic smoothing and flattening phase, bounces, and enters a new epoch of expansion and cooling. This stable evolution cannot occur, however, if scale-invariant curvature perturbations are produced by the entropic mechanism because it requires two scalar fields (e.g., the radion and the Calabi-Yau dilaton) evolving… CONTINUE READING

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