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Pregled bibliografske jedinice broj: 199445

Renormalization-group running cosmologies: A scale-setting procedure


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) (međunarodna recenzija, članak, znanstveni)


Naslov
Renormalization-group running cosmologies: A scale-setting procedure

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

Izvornik
Physical review. D, Particles, fields, gravitation, and cosmology (1550-7998) 71 (2005);

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Renormalization group; scale; cosmology

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Projekt / tema
0098002
0098011

Ustanove
Institut "Ruđer Bošković", Zagreb

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus