Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-09-16
Astronomy and Astrophysics
Astrophysics
5 pages, 3 figures, Proceedings of "Marseille 2003 - Where Cosmology and Fundamental Physics meet", 23-26 June 2003, Marseille
Scientific paper
We study how CMB bispectrum, produced by weak gravitational lensing and structure formation, can constrain the redshift evolution of the dark energy equation of state independently on its present value. Analyzing the line of sight contribution to the angular CMB bispectrum, we find that the relevant redshift at which the structure formation contributes to the signal is $0.1 \lsim z \lsim 2$ for multipoles $1000 \gsim l \gsim 100$: just the epoch when the dark energy starts to dominate the cosmological expansion rate. For scenarios having the same equation of state at the present, this turns out to be a new observable capable to discriminate between models of dark energy with different time evolution of equation of state. We assess the strength of this effetc within the framework of tracking Quintessence trajectories obeying SUGRA and Ratra-Peebles potentials.
Baccigalupi Carlo
Giovi Fabio
Perrotta Francesca
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