Article (Scientific journals)
Gravitational lensing statistics with extragalactic surveys. I. A lower limit on the cosmological constant
Quast, Ralf; Helbig, Phillip
1999In Astronomy and Astrophysics, 344 (3), p. 721-734
Peer Reviewed verified by ORBi
 

Files


Full Text
LOWER_LIMIT.PDF
Author postprint (345.43 kB)
Download

All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
COSMOLOGY: OBSERVATIONS; COSMOLOGY: THEORY; COSMOLOGY: GRAVITATIONAL LENSING
Abstract :
[en] We reanalyse optical gravitational lens surveys from the literature in order to determine relative probabilities in the lambda_ {0}-Omega_ {0} plane, using a softened singular isothermal sphere lens model. In addition, we examine a portion of the lambda_ {0}-Omega_ {0} plane which includes all viable cosmological models; this is vital for comparison with other cosmological tests. The results are, within the errors, consistent with those of more specialised analyses, such as those concerning upper limits on lambda_ {0} in a flat universe. We note that gravitational lensing statistics can provide a quite robust lower limit on the cosmological constant as well, which could prove important in confirming current claims of a positive cosmological constant. At 95% confidence, our lower and upper limits on lambda_ {0}-Omega_ {0}, using lens statistics information alone, are respectively -3.17 and 0.3. For a flat universe, these correspond to lower and upper limits on lambda_ {0} of respectively -1.09 and 0.65.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Quast, Ralf;  Universität Hamburg, Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany
Helbig, Phillip  ;  University of Manchester, Nuffield Radio Astronomy Laboratories, Jodrell Bank, Macclesfield, Cheshire SK11 9DL, England
Language :
English
Title :
Gravitational lensing statistics with extragalactic surveys. I. A lower limit on the cosmological constant
Publication date :
01 April 1999
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
344
Issue :
3
Pages :
721-734
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
TMR Program, Research Contract ERBFMRXCT960034 'CERES'
Funders :
EU - European Commission
Available on ORBi :
since 07 February 2020

Statistics


Number of views
31 (2 by ULiège)
Number of downloads
10 (0 by ULiège)

Scopus citations®
 
20
Scopus citations®
without self-citations
17

Bibliography


Similar publications



Contact ORBi