Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-04-02
Astrophys.J.697:1946-1955,2009
Astronomy and Astrophysics
Astrophysics
submitted to ApJ, replaced with revised version
Scientific paper
10.1088/0004-637X/697/2/1946
When CMB data are used to derive cosmological parameters, their very choice does matter: some parameter values can be biased if the parameter space does not cover the "true" model. This is a problem, because of the difficulty to parametrize Dark Energy (DE) physics. We test this risk through numerical experiments. We create artificial data for dynamical or coupled DE models and then use MCMC techniques to recover model parameters, by assuming a constant DE state parameter w and no DM--DE coupling. For the DE potential considered, no serious bias arises when coupling is absent. On the contrary, \omega_{o,c}, and thence H_o and \Omega_{o,m}, suffer a serious bias when the "true" cosmology includes even just a mild DM--DE coupling. Until the dark components keep an unknown nature, therefore, it can be important to allow for a degree of freedom accounting for DM--DE coupling, even more than increasing the number of parameters accounting for the w(a) behavior.
Bonometto Silvio A.
Colombo Loris P. L.
Vacca Giuseppe La
Vergani Luca
No associations
LandOfFree
Dark Matter - Dark Energy coupling biasing parameter estimates from CMB data does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Dark Matter - Dark Energy coupling biasing parameter estimates from CMB data, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dark Matter - Dark Energy coupling biasing parameter estimates from CMB data will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-389483