INVESTIGADORES
LOPEZ NACIR Diana Laura
artículos
Título:
Running of Newton's constant and non integer powers of the d'Alembertian
Autor/es:
D. LÓPEZ NACIR; F. D. MAZZITELLI
Revista:
PHYSICAL REVIEW D - PARTICLE AND FILDS
Editorial:
Physical Review D
Referencias:
Lugar: New York, Estados Unidos; Año: 2007 vol. 75 p. 240031 - 2400312
ISSN:
0556-2821
Resumen:
The running of Newton's constant can be taken into account by considering covariant, non local generalizations of the field equations of general relativity. These generalizations involve nonanalytic functions of the d'Alembertian, as (-\Box)^{-\alpha}, with \alpha a non integer number, and \ln[-\Box]. In this paper we define these non local operators in terms of the usual two point function of a massive field. We analyze some of their properties, and present specific calculations in flat and Robertson Walker spacetimes.
