Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999ascl.soft09002h&link_type=abstract
Astrophysics Source Code Library, record ascl:9909.002
Astronomy and Astrophysics
Astrophysics
Scientific paper
The calculation of distances is of fundamental importance in extragalactic astronomy and cosmology. However, no practical implementation for the general case has previously been available. We derive a second-order differential equation for the angular size distance valid not only in all homogeneous Friedmann-Lemaitre cosmological models, parametrised by λ_{0} and Ω_{0}, but also in inhomogeneous 'on-average' Friedmann-Lemaitre models, where the inhomogeneity is given by the (in the general case redshift-dependent) parameter eta. Since most other distances can be obtained trivially from the angular size distance, and since the differential equation can be efficiently solved numerically, this offers for the first time a practical method for calculating distances in a large class of cosmological models. We also briefly discuss our numerical implementation, which is publicly available.
Helbig Phillip
Kayser Rainer
Schramm Thomas
No associations
LandOfFree
ANGSIZ: A general and practical method for calculating cosmological distances does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with ANGSIZ: A general and practical method for calculating cosmological distances, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and ANGSIZ: A general and practical method for calculating cosmological distances will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1769559