I think this is one of those papers that will have millions of citations(adsbygoogle = window.adsbygoogle || []).push({});

http://arxiv.org/abs/1205.3807

Accelerated Expansion from Negative Λ

James B. Hartle, S. W. Hawking, Thomas Hertog

(Submitted on 16 May 2012)

Wave functions specifying a quantum state of the universe must satisfy the constraints of general relativity, in particular the Wheeler-DeWitt equation (WDWE). We show for a wide class of models with non-zero cosmological constant that solutions of the WDWE exhibit a universal semiclassical asymptotic structure for large spatial volumes. A consequence of this asymptotic structure is that a wave function in a gravitational theory with a negative cosmological constant can predict an ensemble of asymptotically classical histories which expand with a positive effective cosmological constant. This raises the possibility that even fundamental theories with a negative cosmological constant can be consistent with our low-energy observations of a classical, accelerating universe. We illustrate this general framework with the specific example of the no-boundary wave function in its holographic form. The implications of these results for model building in string cosmology are discussed.

**Physics Forums - The Fusion of Science and Community**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Accelerated Expansion from Negative Λ

Loading...

Similar Threads - Accelerated Expansion Negative | Date |
---|---|

I Less gravity vs. dark energy | Aug 8, 2017 |

Reheating vs particle creation due to acceleration | Jan 20, 2016 |

QM and accelerated frames | Oct 31, 2014 |

Testing Planck-Scale Gravity with Accelerators - Very interesting Article | Oct 15, 2012 |

Acceleration of a universe with -ve Cosmological Constant | Jun 9, 2012 |

**Physics Forums - The Fusion of Science and Community**