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We propose to use alternative cosmic tracers to measure the dark energyequation of state and the matter content of the Universe [w(z) & \Omega_m]. Ourproposed method consists of two components: (a) tracing the Hubble relationusing HII-like starburst galaxies, as an alternative to SNIa, which can bedetected up to very large redshifts, z~4, and (b) measuring the clusteringpattern of X-ray selected AGN at a median redshift of ~1. Each component of themethod can in itself provide interesting constraints on the cosmologicalparameters, especially under our anticipation that we will reduce thecorresponding random and systematic errors significantly. However, by joiningtheir likelihood functions we will be able to put stringent cosmologicalconstraints and break the known degeneracies between the dark energy equationof state (whether it is constant or variable) and the matter content of theuniverse and provide a powerful and alternative rute to measure thecontribution to the global dynamics, and the equation of state, of dark energy.A preliminary joint analysis of X-ray selected AGN (based on a small XMMsurvey) and the currently largest SNIa sample (Kowalski et al 2008), provides:Omega_m=0.28^{+0.02}_{-0.04} and w=-1.0 +-0.1.

Alternative High-z Cosmic Tracers and the Dark Energy Equation of State