Výsledky vyhledávání - "Nicolas Wink"

Akademický článek

Resolving phase transitions with discontinuous Galerkin methods

Publikováno v: SciPost Physics Core, Vol 6, Iss 4, p 071 (2023)

We demonstrate the applicability and advantages of Discontinuous Galerkin (DG) schemes in the context of the Functional Renormalization Group (fRG). We investigate the $O(N)$-model in the large $N$ limit. It is shown that the flow equation for the ef

Externí odkaz: https://doaj.org/article/17395f9667ef42b4aa1eadef8516abb7

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Akademický článek

On the quark spectral function in QCD

Autor: Jan Horak, Jan M. Pawlowski, Nicolas Wink

Publikováno v: SciPost Physics, Vol 15, Iss 4, p 149 (2023)

We calculate the spectral function of light quark flavours in 2+1 flavour vacuum QCD in the isospin-symmetric approximation. We employ spectral Dyson-Schwinger equations and compute the non-perturbative quark propagator directly in real-time, using r

Externí odkaz: https://doaj.org/article/c3cd1602f988401e91a56f8e374e87e9

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Akademický článek

Renormalised spectral flows

Autor: Jens Braun, Yong-rui Chen, Wei-jie Fu, Andreas Geißel, Jan Horak, Chuang Huang, Friederike Ihssen, Jan M. Pawlowski, Manuel Reichert, Fabian Rennecke, Yang-yang Tan, Sebastian Töpfel, Jonas Wessely, Nicolas Wink

Publikováno v: SciPost Physics Core, Vol 6, Iss 3, p 061 (2023)

We derive renormalised finite functional flow equations for quantum field theories in real and imaginary time that incorporate scale transformations of the renormalisation conditions, hence implementing a flowing renormalisation. The flows are manife

Externí odkaz: https://doaj.org/article/266c6c2d3f1743828e976536c89db768

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Non-perturbative strong coupling at timelike momenta

Autor: Jan Horak, Jan M. Pawlowski, Jonas Turnwald, Julian M. Urban, Nicolas Wink, Savvas Zafeiropoulos

Publikováno v: Phys.Rev.D
Phys.Rev.D, 2023, 107 (7), pp.076019. ⟨10.1103/PhysRevD.107.076019⟩
INSPIRE-HEP
Physical Review

We compute the strong coupling constant of Landau gauge QCD in the full complex momentum plane, both directly and via spectral reconstruction. In particular, we consider the Taylor coupling given by the product of ghost and gluon dressing functions.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e73657470466da5893d31555f6052082
https://hal.science/hal-03972556

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Numerical fluid dynamics for FRG flow equations: Zero-dimensional QFTs as numerical test cases. I. The O(N) model

Autor: Adrian Koenigstein, Martin J. Steil, Nicolas Wink, Eduardo Grossi, Jens Braun, Michael Buballa, Dirk H. Rischke

Publikováno v: Physical Review D. 106

The functional renormalization group (FRG) approach is a powerful tool for studies of a large variety of systems, ranging from statistical physics over the theory of the strong interaction to gravity. The practical application of this approach relies

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a04e3cae1914960436264511b0c003a3
https://doi.org/10.1103/physrevd.106.065012

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QMeS-Derivation: Mathematica package for the symbolic derivation of functional equations

Autor: Jan M. Pawlowski, Coralie S. Schneider, Nicolas Wink

Publikováno v: Computer Physics Communications. 287:108711

We present the Mathematica package QMeS-Derivation. It derives symbolic functional equations from a given master equation. The latter include functional renormalisation group equations, Dyson-Schwinger equations, Slavnov-Taylor and Ward identities an

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::09da18389bb565f5adf6af06c3bb5b3b
https://doi.org/10.1016/j.cpc.2023.108711

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Akademický článek

Reconstructing the gluon

Autor: Anton K. Cyrol, Jan M. Pawlowski, Alexander Rothkopf, Nicolas Wink

Publikováno v: SciPost Physics, Vol 5, Iss 6, p 065 (2018)

We reconstruct the gluon spectral function in Landau gauge QCD from numerical data for the gluon propagator. The reconstruction relies on two novel ingredients: Firstly we derive analytically the low frequency asymptotics of the spectral function.

Externí odkaz: https://doaj.org/article/d300dc4e7dd8472881d21e1d2d2454c5

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Reconstructing QCD spectral functions with Gaussian processes

Autor: Jan Horak, Jan M. Pawlowski, José Rodríguez-Quintero, Jonas Turnwald, Julian M. Urban, Nicolas Wink, Savvas Zafeiropoulos

Publikováno v: Physical Review
Arias Montano. Repositorio Institucional de la Universidad de Huelva
Institut de Recerca i Tecnologia Agroalimentàries (IRTA)
Phys.Rev.D
Phys.Rev.D, 2022, 105 (3), pp.036014. ⟨10.1103/PhysRevD.105.036014⟩

We reconstruct ghost and gluon spectral functions in 2 þ 1 flavor QCD with Gaussian process regression. This framework allows us to largely suppress spurious oscillations and other common reconstruction artifacts by specifying generic magnitude and

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dd1dfc29ded3b2c25d859bc4e4bcc5f4
http://repo.scoap3.org/api

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Numerical fluid dynamics for FRG flow equations: Zero-dimensional QFTs as numerical test cases. II. Entropy production and irreversibility of RG flows

Autor: Adrian Koenigstein, Martin J. Steil, Nicolas Wink, Eduardo Grossi, Jens Braun

We demonstrate that the reformulation of renormalization group (RG) flow equations as non-linear heat equations has severe implications on the understanding of RG flows in general. We demonstrate by explicitly constructing an entropy function for a z

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::69845e3596700140ee773a5751999633
http://arxiv.org/abs/2108.10085

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Ghost spectral function from the spectral Dyson-Schwinger equation

Autor: Jan M. Pawlowski, Nicolas Wink, Jan Horak, Joannis Papavassiliou

Publikováno v: Digital.CSIC. Repositorio Institucional del CSIC
instname
Physical Review

We compute the ghost spectral function in Yang-Mills theory by solving the corresponding Dyson-Schwinger equation for a given input gluon spectral function. The results encompass both scaling and decoupling solutions for the gluon propagator input. T

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::33c4fa9f7caea36f118f9135e2edd85e
http://hdl.handle.net/10261/266459

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