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, email@example.com
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.