Summary
The Ward identity for broken scale invariance inn dimensions is shown to be the equation obtained by dimensional analysis. Renormalizing and taking the limtn → 4 allows extraction of the anomaly atn=4. This is found to give either the renormalization group equation or the Callan-Symanzik equation, depending on the renormalization preseription used. Thus, the identity of the two equations is manifest.
Riassunto
Si dimostra che l’identità di Ward per l’invarianza di scala infranta inn dimensioni coincide con l’equazione che si ottiene con l’analisi dimensionale. Rinormalizzando e passando al limite pern → 4 si può isolare l’anomalia an=4. Si trova che ciò produce o l’equazione del gruppo di rinormalizzazione o l’equazione di Callan-Symanzik, a seconda della regola di rinormalizzazione che si è usata. Pertanto è manifesta l’identità delle due equazioni.
Реэюме
Покаэывается, что тождество Уорда для нарущенной масщтабной инвариантности в случае и иэмерений представляет уравнение, полученное иэ аналиэа раэмерности. Перенормировка и предельный переходn → 4 поэволяют исключить аномалию приn=4. Эта процедура приводит либо к уравнению группы перенормировки, либо к уравнению Челлена-Симанэика, которые эависят от испольэованной процедуры перенормировки. Таким обраэом, тождественность зтих двух уравнений является явно выраженной.
Similar content being viewed by others
References
M. Gell-Mann andF. Low:Phys. Rev.,95, 1300 (1954).
New methods have been given byG. ’t Hooft:Nucl. Phys.,61 B, 455 (1973);S. Weinberg:Phys. Rev. D,8, 3497 (1973). The general principles are explained byJ. C. Collins andA. J. Macfarlane:Phys. Rev. D,10, 1201 (1974).
C. G. Callan:Phys. Rev. D,2, 1541 (1970);K. Symanzik:Comm. Math. Phys.,18, 227 (1970);23, 49 (1971).
A very readable presentation of the Callan-Symanzik equation is given byS. Coleman:Erice Lectures, 1971;S. Coleman andR. Jackiw:Ann. of Phys.,67, 552 (1971).
G. ’t Hooft andM. Veltman:Nucl. Phys.,44 B, 189 (1972);G. M. Cicuta andE. Montaldi:Lett. Nuovo Cimento,4, 329 (1972).
D. A. Akyeampong andR. Delbourgo:Nuovo Cimento,19 A, 219 (1974). These authors and also’t Hooft (ref. (2)) note the application of dimensional regularization to scale transformations, but do not follow our line of argument.
This is the usual renormalization program rephrased unconventionally. See’t Hooft or Collins andMacfarlane (ref. (2)New methods have been given by ) for amplification. The point of view described here is convenient for the discussion of scaling, as only the infinite part of the renormalization is of interest.
J. C. Collins andA. J. Macfarlane:Phys. Rev. D,10, 1201 (1974).
Note that the coefficient of the mass derivative is 2 +γ m rather than the 1 +γ m of ref. (2)New methods have been given by. This is because the derivative is with respect tom 2 R rather thanm R .
Author information
Authors and Affiliations
Additional information
Supported by the Science Research Council.
Rights and permissions
About this article
Cite this article
Collins, J.C. Ward identities, the renormalization group and the Callan-Symanzik equation. Nuov Cim A 25, 47–52 (1975). https://doi.org/10.1007/BF02735609
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF02735609