Evidence for a positive cosmological constant from flows of galaxies and distant supernovae

Idit Zehavi () and Avishai Dekel ()
Additional contact information
Idit Zehavi: Racah Institute for Physics, The Hebrew University
Avishai Dekel: Racah Institute for Physics, The Hebrew University

Nature, 1999, vol. 401, issue 6750, 252-254

Abstract: Abstract Recent observations1,2 of high-redshift supernovae seem to suggest that the global geometry of the Universe may be affected by a ‘cosmological constant’, which acts to accelerate the expansion rate with time. But these data by themselves still permit an open universe of low mass density and no cosmological constant. Here we derive an independent constraint on the lower bound to the mass density, based on deviations of galaxy velocities from a smooth universal expansion3,4,5,6,7. This constraint rules out a low-density open universe with a vanishing cosmological constant, and together the two favour a nearly flat universe in which the contributions from mass density and the cosmological constant are comparable. This type of universe, however, seems to require a degree of fine tuning of the initial conditions that is in apparent conflict with ‘common wisdom’.

Date: 1999
References: Add references at CitEc
Citations:

Downloads: (external link)
https://www.nature.com/articles/45748 Abstract (text/html)
Access to the full text of the articles in this series is restricted.

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:nature:v:401:y:1999:i:6750:d:10.1038_45748

Ordering information: This journal article can be ordered from
https://www.nature.com/

DOI: 10.1038/45748

Access Statistics for this article

Nature is currently edited by Magdalena Skipper

More articles in Nature from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().