Theoretical uncertainties for cosmological first-order phase transitions

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http://hdl.handle.net/10138/329697

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Croon , D , Gould , O , Schicho , P , Tenkanen , T V & White , G 2021 , ' Theoretical uncertainties for cosmological first-order phase transitions ' , Journal of High Energy Physics , no. 4 , 055 . https://doi.org/10.1007/JHEP04(2021)055

Title: Theoretical uncertainties for cosmological first-order phase transitions
Author: Croon, Djuna; Gould, Oliver; Schicho, Philipp; Tenkanen, Tuomas V.; White, Graham
Other contributor: University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, University of Bern

Date: 2021-04-07
Language: eng
Number of pages: 100
Belongs to series: Journal of High Energy Physics
ISSN: 1029-8479
DOI: https://doi.org/10.1007/JHEP04(2021)055
URI: http://hdl.handle.net/10138/329697
Abstract: We critically examine the magnitude of theoretical uncertainties in perturbative calculations of fist-order phase transitions, using the Standard Model effective field theory as our guide. In the usual daisy-resummed approach, we find large uncertainties due to renormalisation scale dependence, which amount to two to three orders-of-magnitude uncertainty in the peak gravitational wave amplitude, relevant to experiments such as LISA. Alternatively, utilising dimensional reduction in a more sophisticated perturbative approach drastically reduces this scale dependence, pushing it to higher orders. Further, this approach resolves other thorny problems with daisy resummation: it is gauge invariant which is explicitly demonstrated for the Standard Model, and avoids an uncontrolled derivative expansion in the bubble nucleation rate.
Subject: 114 Physical sciences
Cosmology of Theories beyond the SM
Resummation
Thermal Field Theory
Beyond Standard Model
115 Astronomy, Space science
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