Results 51 to 60 of about 55,124 (278)

Functional renormalization group approach to correlated fermion systems [PDF]

, 2012
Numerous correlated electron systems exhibit a strongly scale-dependent behavior. Upon lowering the energy scale, collective phenomena, bound states, and new effective degrees of freedom emerge.
Abrikosov, A., Anderson, P. W., Anisimov, V., Binz, B., Carsten Honerkamp, Dzyaloshinskii, I. E., Dzyaloshinskii, I. E., Feldman, J., Feldman, J., Feldman, J., Feldman, J., Fradkin, E., Fulde, P., Giamarchi, T., Honerkamp, C., Kamenev, A., Kehrein, S., Kopietz, P., Kurt Schönhammer, Manfred Salmhofer, Negele, J. W., Nozières, P., Polchinski, J., Pomeranchuk, I. J., Popov, V. N., Reed, M., Sachdev, S., Salmhofer, M., Schoeller, H., Schönhammer, K., Taylor, J. R., Tsai, S. W., Volker Meden, Walter Metzner   +33 more
core   +1 more source

Computing the effective action with the functional renormalization group [PDF]

The European Physical Journal C, 2016
40 ...
Codello, A., Percacci, Roberto, Rachwal, L., Tonero, A.   +3 more
openaire   +5 more sources

Isotropic Lifshitz critical behavior from the functional renormalization group

Nuclear Physics B, 2015
The Lifshitz critical behavior for a single component field theory is studied for the specific isotropic case in the framework of the Functional Renormalization Group.
A. Bonanno, D. Zappalà
doaj   +1 more source

The renormalization group with exact β-functions [PDF]

Canadian Journal of Physics, 2006
The perturbative β-function is known exactly in a number of supersymmetric theories and in the ‘t Hooft renormalization scheme in the [Formula: see text] model. It is shown how this allows one to compute the effective action exactly for certain background field configurations and to relate bare and renormalized couplings.
V Elias, D.G.C. McKeon
openaire   +3 more sources

Product Wave Function Renormalization Group [PDF]

Journal of the Physical Society of Japan, 1995
The authors propose a fast numerical renormalization group method --- the product wave function renormalization group (PWFRG) method --- for 1D quantum lattice models and 2D classical ones. A variational wave function, which is expressed by a matrix product, is improved through a self-consistent calculation.
Tomotoshi Nishino, Kouichi Okunishi
openaire   +4 more sources

Functional renormalization group approach to zero-dimensional interacting systems

, 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.
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
core   +1 more source

Critical dynamics in a real-time formulation of the functional renormalization group

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   +1 more source

Functional renormalization group approach for signal detection

SciPost Physics Core
This review paper utilizes renormalization group techniques for signal detection in nearly continuous positive spectra. We emphasize the universal aspects of the analogue field-theory approach.
Vincent Lahoche, Dine Ousmane Samary, Mohamed Tamaazousti
doaj   +1 more source

Creep via dynamical functional renormalization group

, 1998
We study a D-dimensional interface driven in a disordered medium. We derive finite temperature and velocity functional renormalization group (FRG) equations, valid in a 4-D expansion.
Balents L., Chauve P., Feigelman M., Fisher D. S., Ioffe L. B., Larkin A. I., Le Doussal P., Lenormand R., Mikheev L. V., Nattermann T., P Chauve, P. Le Doussal, T Giamarchi, Tang L. H.   +13 more
core   +1 more source

Renormalization of the 4PI effective action using the functional renormalization group [PDF]

Physical Review D, 2019
Techniques based on $n$-particle irreducible effective actions can be used to study systems where perturbation theory does not apply. The main advantage, relative to other non-perturbative continuum methods, is that the hierarchy of integral equations that must be solved truncates at the level of the action, and no additional approximations are needed.
Carrington, M. E., Friesen, S. A., Phillips, C. D., Pickering, D.   +3 more
openaire   +3 more sources