Hrvatska znanstvena bibliografija (CROSBI)



Pregled bibliografske jedinice broj: 191260

Časopis

Autori: Shapiro, I.L.; Sola, J.; Štefančić, Hrvoje
Naslov: Running G and \Lambda at low energies from physics at M_X: possible cosmological and astrophysical implications
Izvornik: Journal of cosmology and astroparticle physics (1475-7516) 1 (2005); 12-12
Vrsta rada: članak
Ključne riječi: renormalization group; Newton constant; cosmological term
Sažetak:
The renormalization group (RG) approach to cosmology is an efficient method to study the possible evolution of the cosmological parameters from the point of view of quantum field theory in curved space-time. In this work we continue our previous investigations of the RG method based on potential low-energy effects induced from physics at very high energy scales M_X near M_P. In the present instance we assume that both the Newton constant, G, and the cosmological term, \Lambda, can be functions of a scale parameter \mu. It turns out that G(\mu) evolves according to a logarithmic law which may lead to asymptotic freedom of gravity, similar to the gauge coupling in QCD. At the same time \Lambda(\mu) evolves quadratically with \mu. We study the consistency and cosmological consequences of these laws when \mu=H. Furthermore, we propose to extend this method to the astrophysical domain after identifying the local RG scale at the galactic level. It turns out that Kepler's third law of celestial mechanics receives quantum corrections that may help to explain the flat rotation curves of the galaxies without introducing the dark matter hypothesis. The origin of these effects (cosmological and astrophysical) could be linked, in our framework, to physics at M_X= 10^{; ; ; 16-17}; ; ; GeV.
Projekt / tema: 0098002
Izvorni jezik: ENG
Rad je indeksiran u
bazama podataka:
Current Contents Connect (CCC)
Scopus
SCI-EXP, SSCI i/ili A&HCI
Science Citation Index Expanded (SCI-EXP) (sastavni dio Web of Science Core Collectiona)
Kategorija: Znanstveni
Znanstvena područja:
Fizika
URL cjelovitog teksta:
Google Scholar: Running G and \Lambda at low energies from physics at M_X: possible cosmological and astrophysical implications