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- W2137675819 endingPage "017" @default.
- W2137675819 startingPage "017" @default.
- W2137675819 abstract "Massless interacting scalar fields in de Sitter space have long been known to experience large fluctuations over length scales larger than Hubble distances. A similar situation arises in condensed matter physics in the vicinity of a critical point, and in this better-understood situation these large fluctuations indicate the failure in this regime of mean-field methods. We argue that for non-Goldstone scalars in de Sitter space, these fluctuations can also be interpreted as signaling the complete breakdown of the semi-classical methods widely used throughout cosmology. By power-counting the infrared properties of Feynman graphs in de Sitter space we find that for a massive scalar interacting through a lambda phi^4$ interaction, control over the loop approximation is lost for masses smaller than m simeq sqrt lambda H/2pi, where H is the Hubble scale. We briefly discuss some potential implications for inflationary cosmology." @default.
- W2137675819 created "2016-06-24" @default.
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- W2137675819 date "2010-10-18" @default.
- W2137675819 modified "2023-10-18" @default.
- W2137675819 title "Breakdown of semiclassical methods in de Sitter space" @default.
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- W2137675819 doi "https://doi.org/10.1088/1475-7516/2010/10/017" @default.
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