Acceptable Inverse Power Law Potential Quintessence with n=18/7

Abstract

We present a particle physics quintessence model which agrees well with existing cosmological data, including the position of the acoustic peaks. This model has an inverse power law potential (IPL) with $n=18/7\sim 2.57$ and it gives $\weff=-0.75$, an acoustic scale $l_A=307$ and a density contrast $\s8=0.95$. Models with $n>1$ have been said to be disfavored by the analysis of the acoustic peaks. However, the results are not correct. The main reason is that the tracker approximation has been used in deriving the IPL constrains and for $n<5$ the scalar field has not reached its tracker value by present day. The model can be derived from particle physics, using Affleck-Dine-Seiberg "ADS" superpotential, for a non-abelian gauge group with $N_c=8,N_f=1$. The advantage of having $N_f=1$ is that there is only one degree of freedom below the condensation scale given by the condensate (quintessence) ${\varphi }^2=<Q\tilde{Q}>$ field. The condensation scale is at $1GeV$ a very interesting scale since it connects the quintessence "Q" with the standard model "SM" scale. The similarity in energy scales between $Q$ and $SM$ scale gives an "explanation" to the coincidence problem. The fact that only recently the universe is accelerating is a natural consequence of the Q scale and the evolution of $\varphi$.

10 pages, LaTeX, 1 figures, accepted in Phys.Lett.B, minor changes, graph added, typos corrected

References in corpus (4)

• Constraints on Omega_m, Omega_L, and Sigma_8, from Galaxy Cluster Redshift Distributions
• Current constraints on the dark energy equation of state
• Natural Quintessence with Gauge Coupling Unification
• Quintessence Restrictions on Negative Power and Condensate Potentials

Cited by in corpus (3)

• Arbitrary scalar field and quintessence cosmological models
• Inverse Power Law Quintessence with Non-Tracking Initial Conditions
• Linking phantom quintessences and tachyons