Cosmic chronometers: constraining the equation of state of dark energy. I: H(z) measurements

By Daniel Stern, Raul Jimenez, L. Verde, M. Kamionkowski, S. Stanford. 2009

1,122 citations recorded by the source corpus.

We present new determinations of the cosmic expansion history from red-envelope galaxies. We have obtained for this purpose high-quality spectra with the Keck-LRIS spectrograph of red-envelope galaxies in 24 galaxy clusters in the redshift range 0.2 < z < 1.0. We complement these Keck spectra with high-quality, publicly available archival spectra from the SPICES and VVDS surveys. We improve over our previous expansion history measurements in Simon et al. (2005) by providing two new determinations of the expansion history: H(z) = 97±62 km sec−1 Mpc−1 at z ≃ 0.5 and H(z) = 90±40 km sec−1 Mpc−1 at z ≃ 0.9. We discuss the uncertainty in the expansion history determination that arises from uncertainties in the synthetic stellar-population models. We then use these new measurements in concert with cosmic-microwave-background (CMB) measurements to constrain cosmological parameters, with a special emphasis on dark-energy parameters and constraints to the curvature. In particular, we demonstrate the usefulness of direct H(z) measurements by constraining the dark-energy equation of state parameterized by w0 and wa and allowing for arbitrary curvature. Further, we also constrain, using only CMB and H(z) data, the number of relativistic degrees of freedom to be 4±0.5 and their total mass to be < 0.2 eV, both at 1σ.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/24ee74552b43ff5708f556c0a06ce3f00cb7eab8

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Citations in the corpus

Improved constraints on the expansion rate of the Universe up to z ∼ 1.1 from the spectroscopic evolution of cosmic chronometers (2012, positive): “Stern et al. (2010) sample.”
Baryon Acoustic Oscillations in the Ly-\alpha\ forest of BOSS quasars (2012, methodology): “Another approach to determiningH(z) uses the evolution of stellar populations as a clock to inferdt/dz (Stern et al., 2010; Moresco et al., 2012).”
TESTING THE DISTANCE–DUALITY RELATION WITH GALAXY CLUSTERS AND TYPE Ia SUPERNOVAE (2010, methodology): “…et al. (2010) used the distance relation, dL = dA(1+ z) 2+ǫ, in a flat ΛCDM model for constraining the cosmic opacity by combining recent SN Type Ia data compilation (Kowalski et al. 2008) with the latest measurements of the Hubble expansion at redshifts on the range 0 < z < 2 (Stern et al. 2010).”
Possible signals of vacuum dynamics in the Universe (2017, methodology): “…Aubourg et al. 2015), the values of the Hubble parameter extracted from cosmic chronometers at various redshifts, H(zi) (Zhang et al. 2014, Jiménez et al. 2003; Simon, Verde & Jiménez 2005; Moresco et al. 2012, 2016; Stern et al. 2010; Moresco 2015), the CMB data from Planck 2015 (Planck collab.”
The WiggleZ Dark Energy Survey: measuring the cosmic expansion history using the Alcock-Paczynski test and distant supernovae (2011, background): “Firstly, H(z) may be inferred from the relative ages of passively-evolving galaxies (Stern et al. 2010).”
On the Hubble Constant Tension in the SNe Ia Pantheon Sample (2021, background): “…Ia; Betoule et al. 2014; Scolnic et al. 2018), Cepheids (Riess et al. 2019), cosmic chronometer probes for the expansion rate of the parameter H(z) (Stern et al. 2010; Moresco et al. 2012; Gomez-Valent & Amendola 2018), cosmic microwave background (CMB) fluctuations (Bennett et al. 2003; Hinshaw…”
HUBBLE PARAMETER MEASUREMENT CONSTRAINTS ON THE REDSHIFT OF THE DECELERATION–ACCELERATION TRANSITION, DYNAMICAL DARK ENERGY, AND SPACE CURVATURE (2016, methodology): “NEW HUBBLE PARAMETER DATA COMPILATION In Table 1 we collect 38 Hubble parameter H(z) measurements from Simon et al. (2005), Stern et al. (2010), Moresco et al. (2012), Blake et al. (2012), Zhang et al. (2012), Font-Ribera et al. (2014), Delubac et al. (2015), Moresco (2015), Moresco et al. (2016),…”
Toward a Better Understanding of Cosmic Chronometers: A New Measurement of H(z) at z ∼ 0.7 (2021, methodology): “C O ] 2 2 M ar 2 02 In initial works, CCs were selected as red massive galaxies and analyzed with stellar population models to both detect those evolving passively and derive their ages (Jimenez 2003; Simon et al. 2005; Stern et al. 2010).”
The Cardassian expansion revisited: constraints from updated Hubble parameter measurements and type Ia supernova data (2017, background): “These H(z) points are MNRAS 000, 000–000 (2017) given by different authors as Zhang et al. (2014); Moresco et al. (2012); Moresco (2015); Moresco et al. (2016); Stern et al. (2010), and constitute the majority of our sample (31 points).”