Volume 407, Number 1, August III 2003
|Page(s)||L9 - L12|
|Published online||17 November 2003|
Letter to the Editor
Limits on dark energy–matter interaction from the Hubble relation for two-fluid FLRW models
Tuorla Observatory, 21500 Piikkiö, Finland
2 Centre for Advanced Studies of the Saint-Petersburg State Technical University, 195251, Politechnicheskaya 29, St. Petersburg, Russia
3 Isaac Newton Institute of Chile, St. Petersburg Branch
4 Astronomical Institute of the Saint-Petersburg University, 198904 St. Petersburg, Russia
Corresponding author: P. Teerikorpi, firstname.lastname@example.org
Accepted: 25 June 2003
In the standard model (, ) it is assumed that there is no convertion (energy transfer) between the two components. However, this hypothesis requires observational tests. A general approach to multicomponent FLRW models comes from a new classification (Gromov et al. [CITE]) which naturally follows from two independent model properties: 1) stationarity (or not) of equations of state of component substances and the presence (or absence) of energy transfer between these. The associated one-fluid model becomes characterized by . For the case (which for a stationary equation state of dark energy means coherent evolution and is caused by energy transfer), a general integral expression for the analogue of the Mattig equation is derived. For flat geometry, the integral reduces to a simple analytic expression. Comparison with the magnitude-redshift relation for the standard model shows that gives the same relation within 0.05 mag in the range . The observable γ gives a robust upper limit to w in the equation of state of dark energy.
Key words: cosmology: theory / dark energy / cosmological parameters
© ESO, 2003
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