Quasar clustering redshift distortion constraints on dark energy
Abstract
Redshift distortions, both geometrical and kinematical, of quasar clustering are simulated, for the Two-Degree Field QSO Redshift Survey (2QZ), showing that they are very effective to constrain the cosmological density and equation of state parameters, Omegam0, Omegax0 and w. Particularly, it emerges that, for the cosmological constant case, the test is especially sensitive to the difference Omegam0 - OmegaLambda 0, whereas, for the spatially flat case, it is quite competitive with future supernova and galaxy count tests, besides being complimentary to them.
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