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2013•The Astrophysical Journal LettersOpen access

HUBBLE PARAMETER MEASUREMENT CONSTRAINTS ON THE COSMOLOGICAL DECELERATION-ACCELERATION TRANSITION REDSHIFT

Omer Farooq, Bharat Ratra

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Abstract

We compile a list of 28 independent measurements of the Hubble parameter between redshifts 0.07 ⩽ z ⩽ 2.3 and use this to place constraints on model parameters of constant and time-evolving dark energy cosmologies. These H ( z ) measurements by themselves require a currently accelerating cosmological expansion at about, or better than, 3σ confidence. The mean and standard deviation of the six best-fit model deceleration–acceleration transition redshifts (for the three cosmological models and two Hubble constant priors we consider) are z da = 0.74 ± 0.05, in good agreement with the recent Busca et al. determination of z da = 0.82 ± 0.08 based on 11 H ( z ) measurements between redshifts 0.2 ⩽ z ⩽ 2.3, almost entirely from baryon-acoustic-oscillation-like data.

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We compile a list of 28 independent measurements of the Hubble parameter between redshifts 0.07 ⩽ z ⩽ 2.3 and use this to place constraints on model parameters of constant and time-evolving dark energy cosmologies. These H ( z ) measurements by themselves require a currently accelerating cosmological expansion at about, or better than, 3σ confidence. The mean and standard deviation of the six best-fit model deceleration–acceleration transition redshifts (for the three cosmological models and two Hubble constant priors we consider) are z da = 0.74 ± 0.05, in good agreement with the recent Busca et al. determination of z da = 0.82 ± 0.08 based on 11 H ( z ) measurements between redshifts 0.2 ⩽ z ⩽ 2.3, almost entirely from baryon-acoustic-oscillation-like data.

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Available abstract

We compile a list of 28 independent measurements of the Hubble parameter between redshifts 0.07 ⩽ z ⩽ 2.3 and use this to place constraints on model parameters of constant and time-evolving dark energy cosmologies. These H ( z ) measurements by themselves require a currently accelerating cosmological expansion at about, or better than, 3σ confidence. The mean and standard deviation of the six best-fit model deceleration–acceleration transition redshifts (for the three cosmological models and two Hubble constant priors we consider) are z da = 0.74 ± 0.05, in good agreement with the recent Busca et al. determination of z da = 0.82 ± 0.08 based on 11 H ( z ) measurements between redshifts 0.2 ⩽ z ⩽ 2.3, almost entirely from baryon-acoustic-oscillation-like data.

Key concepts: Redshift, Physics, Hubble's law, Dark energy, Deceleration parameter, Astrophysics, Acceleration, Cosmological constant

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