Carregant...
Fitxers
Tipus de document
ArticleVersió
Versió publicadaData de publicació
Tots els drets reservats
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/12344
Cosmological constant and the time of its dominance
Títol de la revista
Director/Tutor
ISSN de la revista
Títol del volum
Recurs relacionat
Resum
We explore a model in which the cosmological constant
Λ
and the density contrast at the time of recombination
σ
rec
are random variables, whose range and a priori probabilities are determined by the laws of physics. (Such models arise naturally in the framework of inflationary cosmology.) Based on the assumption that we are typical observers, we show that the order of magnitude coincidence among the three time scales, the time of galaxy formation, the time when the cosmological constant starts to dominate the cosmic energy density, and the present age of the universe, finds a natural explanation. We also discuss the probability distribution for
σ
rec
.
Assuming a power law a priori distribution
∝
σ
−
α
rec
we find that for
α
>
3
the most probable values of
σ
rec
are near the observationally suggested values, whereas for
α
<
3
the typical
σ
rec
would be too large. This may be used to place constraints on inflationary models (or on any alternative theory of initial conditions).
Matèries
Matèries (anglès)
Citació
Citació
GARRIGA TORRES, Jaume, LIVIO, Mario, VILENKIN, A. (alexander). Cosmological constant and the time of its dominance. _Physical Review D_. 2000. Vol. 61, núm. 2, pàgs. 023503-1-023503-9. [consulta: 23 de gener de 2026]. ISSN: 0556-2821. [Disponible a: https://hdl.handle.net/2445/12344]