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Renormalized functional renormalization group [PDF]
Physics Letters B, 2018 We construct a new version of the effective average action together with its flow equation. The construction entails in particular the consistency of fluctuation field and background field equations of motion, even for finite renormalization group scales.
Stefan Lippoldt
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Lectures on the functional renormalization group method [PDF]
Open Physics, 2003 These introductory notes are about functional renormalization group equations and some of their applications. It is emphasised that the applicability of this method extends well beyond critical systems, it actually provides us a general purpose algorithm
Polonyi Janos
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Effective action from the functional renormalization group [PDF]
European Physical Journal C: Particles and Fields, 2020 We study the quantum gravitational system coupled to a charged scalar, Dirac fermions, and electromagnetic fields. We use the “exact” or “functional” renormalization group equation to derive the effective action $$\Gamma _0$$ Γ 0 by integrating the flow ...
Nobuyoshi Ohta, Lesław Rachwał
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Cosmological α′-corrections from the functional renormalization group [PDF]
Journal of High Energy Physics, 2021 We employ the techniques of the Functional Renormalization Group in string theory, in order to derive an effective mini-superspace action for cosmological backgrounds to all orders in the string scale α′.
Ivano Basile, Alessia Platania
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Critical dynamics in a real-time formulation of the functional renormalization group [PDF]
Journal of High Energy Physics, 2023 We present first calculations of critical spectral functions of the relaxational Models A, B, and C in the Halperin-Hohenberg classification using a real-time formulation of the functional renormalization group (FRG). We revisit the prediction by Son and
Johannes V. Roth, Lorenz von Smekal
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Flowing bosonization in the nonperturbative functional renormalization-group approach [PDF]
SciPost Physics, 2022 Bosonization allows one to describe the low-energy physics of one-dimensional quantum fluids within a bosonic effective field theory formulated in terms of two fields: the "density" field $\varphi$ and its conjugate partner, the phase $\vartheta$ of ...
Romain Daviet, Nicolas Dupuis
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Kagome Hubbard model from a functional renormalization group perspective [PDF]
Physical Review ResearchThe recent discovery of a variety of intricate electronic order in kagome metals has sprouted significant theoretical and experimental interest. From an electronic perspective on the potential microscopic origin of these phases, the most basic model is ...
Jonas B. Profe +7 more
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Multiloop functional renormalization group approach to quantum spin systems [PDF]
Physical Review Research, 2022 Renormalization group methods are well-established tools for the (numerical) investigation of the low-energy properties of correlated quantum many-body systems, allowing us to capture their scale-dependent nature.
Dominik Kiese +4 more
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Functional renormalization group approach to the four-body problem [PDF]
EPJ Web of Conferences, 2010 We present a renormalization group analysis of the non-relativistic four-boson problem by means of a simple model with pointlike three- and four-body interactions. We investigate in particular the unitarity point where the scattering length is infinite
Moroz S., Schmidt R.
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The spatial Functional Renormalization Group and Hadamard states on cosmological spacetimes [PDF]
Nuclear Physics B, 2022 A spatial variant of the Functional Renormalization Group (FRG) is introduced on (Lorentzian signature) globally hyperbolic spacetimes. Through its perturbative expansion it is argued that such a FRG must inevitably be state dependent and that it should ...
R. Banerjee, M. Niedermaier
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