Single-scale renormalisation group improvement of multi-scale effective potentials
Sign Up to like & getrecommendations! Published in 2018 at "Journal of High Energy Physics"
DOI: 10.1007/jhep03(2018)014
Abstract: A bstractWe present a new method for renormalisation group improvement of the effective potential of a quantum field theory with an arbitrary number of scalar fields. The method amounts to solving the renormalisation group equation… read more here.
Keywords: renormalisation group; effective potential; group improvement; renormalisation ... See more keywords
Relational observables in asymptotically safe gravity
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DOI: 10.1016/j.aop.2022.168822
Abstract: We introduce an approach to compute the renormalisation group flow of relational observables in quantum gravity which evolve from their microscopic expressions towards the full quantum expectation value. This is achieved by using the composite… read more here.
Keywords: relational observables; gravity; renormalisation group; observables asymptotically ... See more keywords
Renormalisation group improvement in the stochastic formalism
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DOI: 10.1088/1475-7516/2019/09/023
Abstract: We investigate compatibility between the stochastic infrared (IR) resummation of light test fields on inflationary spacetimes and renormalisation group running of the ultra-violet (UV) physics. Using the Wilsonian approach, we derive improved stochastic Langevin and… read more here.
Keywords: renormalisation group; physics; group improvement; formalism ... See more keywords
Computing first-passage times with the functional renormalisation group
Sign Up to like & getrecommendations! Published in 2022 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2023/04/046
Abstract: We use Functional Renormalisation Group (FRG) techniques to analyse the behaviour of a spectator field, σ, during inflation that obeys an overdamped Langevin equation. We briefly review how a derivative expansion of the FRG can… read more here.
Keywords: renormalisation group; time; functional renormalisation; first passage ... See more keywords