THE EFFECTS OF INHOMOGENEITIES ON EVALUATING THE DECELERATION PARAMETER Q(0)

Authors
KANTOWSKI R VAUGHAN T BRANCH D
Citation
R. Kantowski et al., THE EFFECTS OF INHOMOGENEITIES ON EVALUATING THE DECELERATION PARAMETER Q(0), The Astrophysical journal, 447(1), 1995, pp. 35-42
Citations number
22
Categorie Soggetti
Astronomy & Astrophysics
Journal title
The Astrophysical journal → ACNP
ISSN journal
0004637X
Volume
447
Issue
1
Year of publication
1995
Part
1
Pages
35 - 42
Database
ISI
SICI code
0004-637X(1995)447:1<35:TEOIOE>2.0.ZU;2-N
Abstract
Analytic expressions for distance-redshift relations that have been co rrected for the effects of some inhomogeneities in the Friedmann-Rober tson-Walker (FRW) mass density are used to illustrate the significance of inhomogeneities in a determination of q(0) made by using Type Ia s upernovae. The value of q(0) inferred from a given set of observations depends on the fractional amount of matter in inhomogeneities and is up to 50% larger than that obtained by using the standard Mattig m-z r esult for pure-dust FRW models.