Tracking Quintessence, WIMP Relic Density, PAMELA and Fermi LAT

Abstract

The generation of an early kination dominated era within a tracking quintessential model is investigated, the relic density of the Weakly Interacting Massive Particles (WIMPs) is calculated and we show that it can be enhanced with respect to its value in the standard cosmology. By adjusting the parameters of the quintessential scenario, the cold dark matter abundance in the universe can become compatible with large values for the annihilation cross section times the velocity of the WIMPs. Using these values and assuming that the WIMPs annihilate predominantly to ${\mu }^{+}{\mu }^{-}$, we calculate the induced fluxes of $e^{\pm }$ cosmic rays and fit the current PAMELA and Fermi-LAT data. We achieve rather good fits in conjunction with a marginal fulfillment of the restriction arisen from the cosmic microwave background radiation.

To appear in the proceedings of 9th Hellenic School and Workshops on Elementary Particle Physics and Gravity, Corfu (Greece) August 30 - September 20, 2009

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• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Observation of an anomalous positron abundance in the cosmic radiation
• Measurement of the Cosmic Ray e+ plus e- spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope
• CMB Constraints on WIMP Annihilation: Energy Absorption During the Recombination Epoch
• Gamma-ray and radio tests of the e+e- excess from DM annihilations
• Minimal Dark Matter predictions for galactic positrons, anti-protons, photons
• Phenomenology of Dark Matter annihilation into a long-lived intermediate state
• Tracking Quintessence and Cold Dark Matter Candidates

Cited by in corpus (2)

• Dilaton dominance in the early Universe dilutes Dark Matter relic abundances
• Dilaton dominance relaxes LHC and cosmological constraints in supersymmetric models