Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-05-15
Nucl.Phys.Proc.Suppl.124:68-71,2003
Astronomy and Astrophysics
Astrophysics
4 pages including 2 figures, Dark Matter 2002 proceedings, Nucl.Phys.B in press
Scientific paper
10.1016/S0920-5632(03)02079-6
A dynamical scalar field represents the simplest generalization of a pure Cosmological Constant as a candidate to explain the recent evidence in favour of the accelerated cosmic expansion. We review the dynamical properties of such a component, and argue that, even if the background expectation value of this field is fixed and the equation of state is the same as a Cosmological Constant, scalar field fluctuations can still be used to distinguish the two components. We compare predicted spectra of Cosmic Microvave Background (CMB) anisotropies in tracking scalar field cosmologies with the present CMB data, in order to get constraints on the amount and equation of state of dark energy. High precision experiments like SNAP, {\sc Planck} and {\sc SNfactory}, together with the data on Large Scale Structure, are needed to probe this issue with the necessary accuracy. Here we show the intriguing result that, with a strong prior on the value of the Hubble constant today, the assumption of a flat universe, and consistency relations between amplitude and spectral index of primordial gravitational waves, the present CMB data at $1\sigma$ give indication of a dark energy equation of state larger than -1, while the ordinary Cosmological Constant is recovered at $2\sigma$.
Baccigalupi Carlo
Balbi Amedeo
Matarrese Sabino
Perrotta Francesca
Vittorio Nicola
No associations
LandOfFree
Scalar field dark energy and Cosmic Microwave Background 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 Scalar field dark energy and Cosmic Microwave Background, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Scalar field dark energy and Cosmic Microwave Background will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-488672