Citation

L. Parker et A. Raval, Vacuum effects of an ultralow mass particle account for the recent acceleration of the universe - art. no. 123502, PHYS REV D, 6012(12), 1999, pp. 3502

Citations number

15

Language

INGLESE

art.tipo

Article

Categorie Soggetti

Physics

Journal title

PHYSICAL REVIEW D

ISSN journal

0556-2821
→ ACNP

Volume

6012

Issue

12

Year of publication

1999

Database

ISI

SICI code

0556-2821(199912)6012:12<3502:VEOAUM>2.0.ZU;2-Y

Abstract

In recent work, we showed that non-perturbative vacuum effects of a very lo
w mass particle could induce, at a redshift of order 1, a transition from a
matter-dominated to an accelerating universe. In that work, we used the si
mplification of a sudden transition out of the matter-dominated stage and w
ere able to fit the type Ia supernovae (SNe-Ia) data points with a spatiall
y open universe. In the present work, we find a more accurate, smooth spati
ally-flat analytic solution to the quantum-corrected Einstein equations. Th
is solution gives a good fit to the SNe-Ia data with a particle mass parame
ter m(k) in the range 6.40 X 10(-33) eV to 7.25 X 10(-33) eV. It follows th
at the ratio of total matter density (including dark matter) to critical de
nsity, Ohm(0), is in the range 0.58 to 0.151 and the age to of the universe
is in the range 8.10h(-1) to 12.2h(-1) Gyr, where h is the present value o
f the Hubble constant, measured as a fraction of the value 100 km/(s Mpc).
This spatially-flat model agrees with estimates of the position of the firs
t acoustic peak in the small angular scale fluctuations of the cosmic backg
round radiation and with light-element abundances of standard big-bang nucl
eosynthesis. Our model has only a single free parameter, m(h), and does not
require that we five at a special time in the evolution of the universe. [
S0556-2821(99)01024-3].