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001-es BibID:	BIBFORM076183
Első szerző:	Borbélyné Bacsó Viktória (fizika-matematika tanár)
Cím:	c-function and central charge of the sine-Gordon model from the non-perturbative renormalization group flow / V. Bacsó, N. Defenu, A. Trombettoni, I. Nándori
Dátum:	2015
ISSN:	0550-3213
Megjegyzések:	In this paper we study the c-function of the sine-Gordon model taking explicitly into account the periodicity of the interaction potential. The integration of the c-function along trajectories of the non-perturbative renormalization group flow gives access to the central charges of the model in the fixed points. The results at vanishing frequency ?2, where the periodicity does not play a role, are retrieved and the independence on the cutoff regulator for small frequencies is discussed. Our findings show that the central charge obtained integrating the trajectories starting from the repulsive low-frequencies fixed points (?2 < 8?) to the infra-red limit is in good quantitative agreement with the expected c = 1 result. The behavior of the c-function in the other parts of the flow diagram is also discussed. Finally, we point out that including also higher harmonics in the renormalization group treatment at the level of local potential approximation is not sufficient to give reasonable results, even if the periodicity is taken into account. Rather, incorporating the wave-function renormalization (i.e. going beyond local potential approximation) is crucial to get sensible results even when a single frequency is used.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:	Nuclear Physics B. - 901 (2015), p. 444-460. -
További szerzők:	Defenu, N. Trombettoni, Andrea Nándori István (1973-) (fizikus)
Internet cím:	DOI Intézményi repozitóriumban (DEA) tárolt változat
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