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

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