Harmonic cosmology: How much can we know about a universe before the big bang?

Abstract

Quantum gravity may remove classical space-time singularities and thus reveal what a universe at and before the big bang could be like. In loop quantum cosmology, an exactly solvable model is available which allows one to address precise dynamical coherent states and their evolution in such a setting. It is shown here that quantum fluctuations before the big bang are generically unrelated to those after the big bang. A reliable determination of pre-big bang quantum fluctuations would require exceedingly precise observations.

16 pages

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Cited by in corpus (16)

• Consistent Loop Quantum Cosmology
• Quantum nature of cosmological bounces
• Quantum Cosmology: Effective Theory
• Inflationary observables in loop quantum cosmology
• Recollapsing quantum cosmologies and the question of entropy
• The high-density regime of kinetic-dominated loop quantum cosmology
• Comment on "Quantum bounce and cosmic recall" [arXiv:0710.4543]
• Fluctuation energies in quantum cosmology
• Reply to `Comment on "Quantum Bounce and Cosmic Recall"' [arXiv:0811.2790]
• Big Bounce in Dipole Cosmology
• Generalised Gaussian states in group field theory and $\mathfrak{su}(1,1)$ quantum cosmology
• Cosmic tangle: Loop quantum cosmology and CMB anomalies
• Tunneling dynamics in cosmological bounce models
• Quantum gravity, space-time structure, and cosmology
• Weyl Curvature Hypothesis in light of Quantum Backreaction at Cosmological Singularities or Bounces
• Singularities in loop quantum cosmology