Constraining super-critical string/brane cosmologies with astrophysical data
arXiv:0909.5095 · doi:10.1088/1742-6596/203/1/012054
Abstract
We discuss fits of unconventional dark energy models to the available data from high-redshift supernovae, distant galaxies and baryon oscillations. The models are based either on brane cosmologies or on Liouville strings in which a relaxation dark energy is provided by a rolling dilaton field (Q-cosmology). Such cosmologies feature the possibility of effective four-dimensional negative-energy dust and/or exotic scaling of dark matter. We find evidence for a negative-energy dust at the current era, as well as for exotic-scaling (a^{-delta}) contributions to the energy density, with delta ~= 4, which could be due to dark matter coupling with the dilaton in Q-cosmology models. We conclude that Q-cosmology fits the data equally well with the LambdaCDM model for a range of parameters that are in general expected from theoretical considerations.
4 pages, 2 figures, Contributed to 11th International Conference on Topics in Astroparticle and Underground Physics (TAUP 2009) 1-5 Jul 2009, Rome, Italy; J. Phys. Conf. Series to appear
References in corpus (12)
- New Hubble Space Telescope Discoveries of Type Ia Supernovae at z > 1: Narrowing Constraints on the Early Behavior of Dark Energy
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Likelihoods and Parameters from the WMAP data
- Testing Einstein's special relativity with Fermi's short hard gamma-ray burst GRB090510
- Probing quantum gravity using photons from a flare of the active galactic nucleus Markarian 501 observed by the MAGIC telescope
- Derivation of a Vacuum Refractive Index in a Stringy Space-Time Foam Model
- Probing a Possible Vacuum Refractive Index with Gamma-Ray Telescopes
- Smoothly evolving Supercritical-String Dark Energy relaxes Supersymmetric-Dark-Matter Constraints
- Primordial inflation explains why the universe is accelerating today
- Dissipative Liouville Cosmology: A Case Study
- Dilaton and off-shell (non-critical string) effects in Boltzmann equation for species abundances
- Supersymmetry Signals of Supercritical String Cosmology at the Large Hadron Collider
- Observational Evidence for Negative-Energy Dust in Late-Times Cosmology