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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
doaj   +4 more sources

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
doaj   +7 more sources

Functional renormalization group approach to neutron matter [PDF]

Physics Letters B, 2014
The chiral nucleon-meson model, previously applied to systems with equal number of neutrons and protons, is extended to asymmetric nuclear matter. Fluctuations are included in the framework of the functional renormalization group.
Matthias Drews, Wolfram Weise
doaj   +8 more sources

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
doaj   +6 more sources

Spectral Functions from the Functional Renormalization Group [PDF]

Nuclear Physics A, 2017
We present results for in-medium spectral functions obtained within the Functional Renormalization Group framework. The analytic continuation from imaginary to real time is performed in a well-defined way on the level of the flow equations. Based on this
Jung, Christopher, Rennecke, Fabian, Tripolt, Ralf-Arno, von Smekal, Lorenz, Wambach, Jochen   +4 more
core   +11 more sources

Deep Learning the Functional Renormalization Group. [PDF]

Physical Review Letters, 2022
We perform a data-driven dimensionality reduction of the scale-dependent four-point vertex function characterizing the functional renormalization group (FRG) flow for the widely studied two-dimensional t-t^{'} Hubbard model on the square lattice.
D. D. Sante, Matija Medvidovi'c, A. Toschi, G. Sangiovanni, C. Franchini, Anirvan M. Sengupta, A. Millis   +6 more
semanticscholar   +6 more sources

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
doaj   +2 more sources

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
doaj   +2 more sources

Functional renormalization group approach to zero-dimensional interacting systems [PDF]

J. Phys.: Condensed Matter 16, 5279 (2004), 2004
We apply the functional renormalization group method to the calculation of dynamical properties of zero-dimensional interacting quantum systems. As case studies we discuss the anharmonic oscillator and the single impurity Anderson model. We truncate the hierarchy of flow equations such that the results are at least correct up to second order ...
Allen J W, Andergassen S, Andergassen S Enss T Meden V Metzner W Schollwöck U Schönhammer K, Busche T, Dusuel S Uhrig G, Georges A, Glazek S D, Hewson A C, K Schönhammer, Katanin A A, Knetter C, Kondo J, Krishnamurthy H R, Logan D, Logan D, Maier Th Jarrell M Pruschke Th Hettler M, Meden V, Meden V Enss T Andergassen S Metzner W Schönhammer K, Morris T R, Negele J W, Press W H, Pruschke Th, R Hedden, Ragwitz M, Salmhofer M, Th Pruschke, V Meden, Wegner F, Wilson K G   +28 more
arxiv   +3 more sources

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
doaj   +2 more sources