Results 61 to 70 of about 1,476,489 (293)
Fermionic spectral functions with the functional renormalization group [PDF]
Physical Review D, 2018 We present first results on the calculation of fermionic spectral functions from analytically continued flow equations within the functional renormalization group approach. Our method is based on the same analytic continuation from imaginary to real frequencies that was developed and used previously for bosonic spectral functions.
Ralf-Arno Tripolt +4 more
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On ambiguities and divergences in perturbative renormalization group functions [PDF]
Journal of High Energy Physics, 2021 Abstract There is an ambiguity in choosing field-strength renormalization factors in the $$ \overline{\mathrm{MS}} $$ MS ¯ scheme starting from the 3-loop order in perturbation theory. More concerning, trivially choosing Hermitian factors
Florian Herren, Anders Eller Thomsen
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Exact renormalization group for wave functionals
Progress of Theoretical and Experimental Physics, 2023 AbstractMotivated by the construction of continuum tensor networks for interacting field theories, which are relevant in understanding the emergence of space-time in the gauge/gravity correspondence, we derive a non-perturbative functional differential equation for wave functionals in scalar field theories from the exact renormalization group equation.
Kuwahara, Takaaki +3 more
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Limit of vanishing regulator in the functional renormalization group [PDF]
Physical Review D, 2021 The non-perturbative functional renormalization group equation depends on the choice of a regulator function, whose main properties are a "coarse-graining scale" $k$ and an overall dimensionless amplitude $a$. In this paper we shall discuss the limit $a\to0$ with $k$ fixed.
Baldazzi, Alessio +2 more
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Journal of Computational Chemistry, Volume 44, Issue 3, Page 190-198, January 30, 2023., 2023 Actinoid tetroxide molecules AnO4 (An = Ac – Cm) are investigated by the multi‐configurational DMRG approach. The Natural Orbital Plots show the number of local An‐5f electrons, and thereby the oxidation states, at one glance. The 5f orbital's increasing energetic stability and spatial immersion in the actinide cores along the series of actinoids ...
Jun‐Bo Lu +5 more
wiley +1 more source
Bonding situations in tricoordinated beryllium phenyl complexes
Journal of Computational Chemistry, Volume 44, Issue 3, Page 397-405, January 30, 2023., 2023 The bonding situation in tricoordinated beryllium phenyl complexes was evaluated. In all compounds π‐delocalisation was present in all compounds even though the beryllium‐element bonds are highly polarized. This delocalisation accounts for the rather small contribution of π‐interactions to the overall orbital energies of these compounds.
Lewis R. Thomas‐Hargreaves +4 more
wiley +1 more source
Renormalization scheme dependence and the renormalization group beta function [PDF]
Physical Review D, 2017 16 pages, 1 figure, minor typos fixed and additional comments made; accepted at Physical Review ...
D. G. C. McKeon +3 more
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Redox‐active ligands as a challenge for electronic structure methods
Journal of Computational Chemistry, Volume 44, Issue 3, Page 468-479, January 30, 2023., 2023 The 3d transition metal complexes with redox‐active ligands are highly attractive for catalysis, but a challenge for first‐principles electronic structure methods such as density functional theory (DFT). The ligands’ redox‐activity can lead to the self‐consistent field algorithm converging to high‐energy solutions.
Ursula Rastetter +2 more
wiley +1 more source
Bound states in functional renormalization group [PDF]
International Journal of Modern Physics A, 2019 Equivalence criteria are established for an effective Yukawa-type theory of composite fields representing two-particle fermion bound states with the original “microscopic” theory of interacting fermions based on the spectral decomposition of the 2-to-2 fermion scattering amplitude. Functional renormalization group equations of the effective theory are
Antal Jakovác, András Patkós
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Prescription dependence of renormalization-group functions [PDF]
Physical Review D, 1982 The dependence on the renormalization scheme of the important QCD renormalization-group parameters β , γ , and δ is discussed. We compute the second coefficient for all three parameters for several renormalization schemes which include all the standard ones.
Espriu, D. (Domènec) +1 more
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