ACCELERATING UNIVERSES WITH SCALING DARK MATTER

@article{Chevallier2000ACCELERATINGUW,
  title={ACCELERATING UNIVERSES WITH SCALING DARK MATTER},
  author={Michele Chevallier and David Polarski},
  journal={International Journal of Modern Physics D},
  year={2000},
  volume={10},
  pages={213-224}
}
Friedmann–Robertson–Walker universes with a presently large fraction of the energy density stored in an X-component with wX<-1/3, are considered. We find all the critical points of the system for constant equations of state in that range. We consider further several background quantities that can distinguish the models with different wX values. Using a simple toy model with a varying equation of state, we show that even a large variation of wX at small redshifts is very difficult to observe… Expand

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References

SHOWING 1-10 OF 30 REFERENCES
Reconstructing the cosmic equation of state from supernova distances.
TLDR
A model-independent method for estimating the form of the potential V(phi) of the scalar field driving this acceleration, and the associated equation of state w(phi), based on a versatile analytical form for the luminosity distance D(L). Expand
Cosmological imprint of an energy component with general equation of state
We examine the possibility that a significant component of the energy density of the Universe has an equation of state different from that of matter, radiation, or cosmological constant ({Lambda} ).Expand
How to determine an effective potential for a variable cosmological term
It is shown that if a variable cosmological term in the present Universe is described by a scalar field with minimal coupling to gravity and with some phenomenological self-interaction potentialExpand
Cosmological consequences of a rolling homogeneous scalar field.
  • Ratra, Peebles
  • Physics, Medicine
  • Physical review. D, Particles and fields
  • 1988
TLDR
It is argued that a number of models in which the energy density of the scalar field red-shifts in a specific manner are studied could reconcile the low dynamical estimates of the mean mass density with the negligibly small spatial curvature preferred by inflation. Expand
The Case for a positive cosmological Lambda term
Recent observations of Type 1a supernovae indicating an accelerating universe have once more drawn attention to the possible existence, at the present epoch, of a small positive Lambda-termExpand
Reconstruction of a scalar-tensor theory of gravity in an accelerating universe
TLDR
The present acceleration of the Universe strongly indicated by recent observational data can be modeled in the scope of a scalar-tensor theory of gravity by determining the structure of this theory along with the present density of dustlike matter from two observable cosmological functions. Expand
Constraints on Cosmological Models from Hubble Space Telescope Observations of High-z Supernovae
We have coordinated Hubble Space Telescope (HST) photometry with ground-based discovery for three supernovae: Type Ia supernovae near z ≈ 0.5 (SN 1997ce, SN 1997cj) and a third event at z = 0.97 (SNExpand
A flat Universe from high-resolution maps of the cosmic microwave background radiation
TLDR
The first images of resolved structure in the microwave background anisotropies over a significant part of the sky are reported, consistent with that expected for cold dark matter models in a flat (euclidean) Universe, as favoured by standard inflationary models. Expand
Discovery of a supernova explosion at half the age of the Universe
The ultimate fate of the Universe, infinite expansion or a big crunch, can be determined by using the redshifts and distances of very distant supernovae to monitor changes in the expansion rate. WeExpand
Cosmology - The cosmic triangle: Revealing the state of the universe
The cosmic triangle is introduced as a way of representing the past, present and future status of the universe. Our current location within the cosmic triangle is determined by the answers to threeExpand
...
1
2
3
...