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Search: WFRF:(Rajantie Arttu)

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1.
  • Camargo-Molina, J. Eliel, et al. (author)
  • Phase transitions in de Sitter spacetimes : Quantum Corrections
  • 2023
  • In: Physical Review D. - : American Physical Society. - 2470-0010 .- 2470-0029. ; 107:6
  • Journal article (peer-reviewed)abstract
    • We investigate the decay rate of a false vacuum state in de Sitter space at high Hubble rates, using two methods: the Hawking-Moss instanton method which is fully quantum mechanical but relies on the saddlepoint approximation, and the Starobinsky-Yokoyama stochastic approach which is nonperturbative but does not include quantum effects. We use the flux over population method to compute the Hawking-Moss decay rate at one-loop order, and demonstrate that in its domain of validity, it is reproduced by the stochastic calculation using the one-loop constraint effective potential. This suggests that the stochastic approach together with the constraint effective potential can be used to accurately describe vacuum decay beyond the saddle-point approximation.
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2.
  • Camargo-Molina, J. Eliel, et al. (author)
  • Phase transitions in de Sitter spacetimes : The stochastic formalism
  • 2023
  • In: Physical Review D. - : American Physical Society. - 2470-0010 .- 2470-0029. ; 107:10
  • Journal article (peer-reviewed)abstract
    • The stochastic spectral expansion method offers a simple framework for calculations in de Sitter spacetimes. We show how to extend its reach to metastable vacuum states, both in the case when the potential is bounded from below, and when it is unbounded from below and therefore no stable vacuum state exists. In both cases, the decay rate of the metastable vacuum is given by the lowest nonzero eigenvalue associated to the Fokker-Planck equation. We show how the corresponding eigenfunction determines the field probability distribution which can be used to compute correlation functions and other observables in the metastable vacuum state.
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  • Result 1-2 of 2
Type of publication
journal article (2)
Type of content
peer-reviewed (2)
Author/Editor
Camargo-Molina, J. E ... (2)
Rajantie, Arttu (2)
Gonzalez, Mariana Ca ... (1)
University
Uppsala University (2)
Language
English (2)
Research subject (UKÄ/SCB)
Natural sciences (2)
Year
2023 (2)

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