Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2011-08-05
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
9 pages, Revtex file, 6 eps figures, 1 Table
Scientific paper
We study the observational constraints for the axion models in string theory which can successfully act as quintessence. The evolution of the universe in this model is sensitive to the initial value of the axion field. This initial value of the axion field controls deviation of the cosmic evolution from the \Lambda CDM behaviour. We use the recent Union2 Supernova Type Ia dataset as well as the data from BAO measurements, the WMAP measurement of the shift parameter and the $H(z)$ measurements. Using these data, the reconstructed equation of state of the axion field has extremely small deviation from the cosmological constant \omega = -1 even at 2\sigma confidence level. One interesting outcome of this analysis is that one can put bound on the SUSY breaking scale using cosmological measurements assuming the values of different string related parameters and vice versa.
Gupta Gaveshna
Panda Sudhakar
Sen Anjan A.
No associations
LandOfFree
Observational Constraints on Axions as Quintessence in String Theory 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 Observational Constraints on Axions as Quintessence in String Theory, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Observational Constraints on Axions as Quintessence in String Theory will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-668549