Nalazite se na CroRIS probnoj okolini. Ovdje evidentirani podaci neće biti pohranjeni u Informacijskom sustavu znanosti RH. Ako je ovo greška, CroRIS produkcijskoj okolini moguće je pristupi putem poveznice www.croris.hr
izvor podataka: crosbi

Renormalization-group running cosmologies: A scale-setting procedure (CROSBI ID 114696)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Babić, Ana ; Guberina, Branko ; Horvat, Raul ; Štefančić, Hrvoje Renormalization-group running cosmologies: A scale-setting procedure // Physical review. D, Particles, fields, gravitation, and cosmology, 71 (2005), 124041-x

Podaci o odgovornosti

Babić, Ana ; Guberina, Branko ; Horvat, Raul ; Štefančić, Hrvoje

engleski

Renormalization-group running cosmologies: A scale-setting procedure

For cosmologies including scale dependence of both the cosmological and the gravitational constant, an additional consistency condition dictated by the Bianchi identities emerges, even if the energy-momentum tensor of ordinary matter stays individually conserved. For renormalization-group (RG) approaches it is shown that such a consistency relation ineluctably fixes the RG scale (which may have an explicit as well as an implicit time dependence), provided that the solutions of the RG equation for both quantities are known. Hence, contrary to the procedures employed in the recent literature, we argue that there is no more freedom in identification of the RG scale in terms of the cosmic time in such cosmologies. We carefully set the RG scale for the RG evolution phrased in a quantum gravity framework based on the hypothetical existence of an infrared (IR) fixed point, for the perturbative regime within the same framework, as well as for an evolution within quantum field theory (QFT) in a curved background. In the latter case, the implications of the scale setting for the particle spectrum are also briefly discussed.

renormalization group; scale; cosmology

nije evidentirano

nije evidentirano

nije evidentirano

nije evidentirano

nije evidentirano

nije evidentirano

Podaci o izdanju

71

2005.

124041-x

objavljeno

1550-7998

Povezanost rada

Fizika

Indeksiranost