Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012ap%26ss.tmp...35s&link_type=abstract
Astrophysics and Space Science, Online First
Astronomy and Astrophysics
Astrophysics
Cosmology, Acceleration, Structural Stability
Scientific paper
Recent astronomical observations strongly indicate that the current Universe is undergoing an accelerated phase of its expansion. If the Universe evolution is described by the FRW model then the acceleration should be driven by some perfect substance violating the strong energy condition. Hence the negative pressure is required for the explanation of acceleration. While different candidates for the fluid termed dark energy have been suggested, the positive cosmological constant seems to be the simplest candidate for dark energy description. However the Lambda term treated as a quantum vacuum energy has no simple physical interpretation because of the fine tuning problem. In this paper we characterize a certain class of evolutional scenario of the accelerating universe from the point of view genericity expressed in notion of structural stability. It is shown that in this class all evolutional scenarios with transient acceleration effect are not generic. Only the LCDM model with the acceleration phase following the deceleration phase is structurally stable. Because the cosmological models with transient acceleration appear in string theory we conclude that they are not generic.
No associations
LandOfFree
Generic scenarios of the accelerating Universe 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 Generic scenarios of the accelerating Universe, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Generic scenarios of the accelerating Universe will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-888575