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Astron. Astrophys. 349, 729-734 (1999)

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Research Note

Closed and open FRW cosmologies with matter creation: kinematic tests

J.S. Alcaniz and J.A.S. Lima

Departamento de Fisica, UFRN, C.P 1641, 59072-970 Natal, Brasil

Received 7 June 1999 / Accepted 19 July 1999


The limits imposed by the classical cosmological tests on closed and open FRW universes driven by adiabatic matter creation are investigated. Exact expressions for the lookback time, age of the universe, luminosity distance, angular diameter, and galaxy number counts versus redshift are derived and their meaning discussed in detail. An interesting consequence of these cosmological models is the possibility of an accelerated expansion today (as indicated from supernovae observations) with no need to invoke either a cosmological constant or an exotic "quintessence" component.

Key words: cosmology: theory

Send offprint requests to: J.A.S. Lima

© European Southern Observatory (ESO) 1999

Online publication: September 13, 1999