Planckian Birth of the Quantum de Sitter Universe

Details Planckian Birth of the Quantum de Sitter Universe Planckian Birth of the Quantum de Sitter Universe

2007-12-17

arxiv.org/abs/0712.2485v2

Phys.Rev.Lett.100:091304, 2008

Physics

High Energy Physics

High Energy Physics - Theory

Article unchanged. Line added in acknowledgment

Scientific paper

10.1103/PhysRevLett.100.091304

We show that the quantum universe emerging from a nonperturbative, Lorentzian sum-over-geometries can be described with high accuracy by a four-dimensional de Sitter spacetime. By a scaling analysis involving Newton's constant, we establish that the linear size of the quantum universes under study is in between 17 and 28 Planck lengths. Somewhat surprisingly, the measured quantum fluctuations around the de Sitter universe in this regime are to good approximation still describable semiclassically. The numerical evidence presented comes from a regularization of quantum gravity in terms of causal dynamical triangulations.

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