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Quantum Fluctuations in Cosmology and How They Lead to a Multiverse

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arxiv 1312.7340 v1 pith:RL6GDQI7 submitted 2013-12-27 hep-th gr-qc

Alan H. Guth This is my paper · ORCID
classification hep-thgr-qc
keywords fluctuationsquantuminflationinflationarymodelsperturbationsalmostanother
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This article discusses density perturbations in inflationary models, offering a pedagogical description of how these perturbations are generated by quantum fluctuations in the early universe. A key feature of inflation is that that rapid expansion can stretch microscopic fluctuations to cosmological proportions. I discuss also another important conseqence of quantum fluctuations: the fact that almost all inflationary models become eternal, so that once inflation starts, it never stops.

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  1. Probability of the Initial Conditions for Inflation and Slow Contraction

    gr-qc 2025-05 conditional novelty 6.0 of 10

    A probability estimate for scalar-field homogeneity at the onset of inflation and slow contraction concludes that, after optimizing over initial spectra, inflation is vastly more likely than ekpyrosis to have the requ...

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