Constraining Cosmological Parameters Based on Relative Galaxy Ages

By Raul Jimenez, Abraham Loeb. 2001

881 citations recorded by the source corpus.

We propose to use relative galaxy ages as a means of constraining cosmological parameters. By measuring the age difference between two ensembles of passively evolving galaxies at somewhat different redshifts, one could determine the derivative of redshift with respect to cosmic time, dz/dt. At high redshifts, z ~ 1-2, this measurement would constrain the equation of state of the dark energy, while at low redshifts, z ≲ 0.2, it would determine the Hubble constant, H0. Furthermore, we show that d2z/dt2 directly tracks the equation of state of the dark energy; thus, measurements of this quantity at low redshifts can be used to constrain it. The selected galaxies need to be passively evolving on a time much longer than their age difference.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/1555fd6d74e093a4ac61a29f320926816ad2c77d

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Citations in the corpus

The trouble with H0 (2016, methodology): “Since BAO measure DV /rs (or DA/rs and Hrs in the anisotropic analysis) the only way to constrain rs without making assumptions about the early universe physics is combining the BAO measurement with other probes of the expansion rate (such as H0, cosmic clocks [29] or gravitational lensing time dela”
Improved constraints on the expansion rate of the Universe up to z ∼ 1.1 from the spectroscopic evolution of cosmic chronometers (2012, methodology): “[7, 11, 12], is that it is based on a differential approach.”
Age-dating luminous red galaxies observed with the Southern African Large Telescope (2016, methodology): “A complementary technique known as cosmic chronometers (CC), originally proposed by Jimenez & Loeb (2002), uses passively evolving early–type galaxies to measure the Hubble pa- ∗based on observations made with the Southern African Large Telescope (SALT).”
Observational probes of cosmic acceleration (2012, background): “Jimenez and Loeb (2002) proposed using differential ages of galaxies at different redshifts to measure, in effect, H(z).”
Constraints on the Equation of State of Dark Energy and the Hubble Constant from Stellar Ages and the Cosmic Microwave Background (2003, methodology): “To obtain dz=dt, Jimenez & Loeb (2002) proposed using the old envelope of the age-redshift relation of E/S0 galaxies.”
f(T) teleparallel gravity and cosmology (2015, methodology): “As the Hubble diagram probes the integrated expansion rate, the second data set refers to the Hubble parameter H(z) which can be determined through the differential age method [483].”
Cosmic chronometers: constraining the equation of state of dark energy. I: H(z) measurements (2009, neutral): “The purpose of the differential-age technique [18] is to circumvent this limitation by measuring directly the integrand, dt/dz, or, in other words, the change in the age of the Universe as a”
Toward a Better Understanding of Cosmic Chronometers: A New Measurement of H(z) at z ∼ 0.7 (2021, background): “(1) The idea of using a homogeneous population of astrophysical objects to trace dtU , i.e. cosmic chronometers (CC), came from Jimenez & Loeb (2002), who proposed massive passively evolving galaxies as ideal CC candidates.”
The WiggleZ Dark Energy Survey: joint measurements of the expansion and growth history at z < 1 (2012, background): “We note that the Hubble expansion rate as a function of redshift may also be inferred from the relative ages of passively-evolving galaxies (Jimenez & Loeb 2002, Stern et al. 2010, Carson & Nichol 2010, Moresco et al. 2012).”
New observational constraints on f(R) gravity from cosmic chronometers (2016, methodology): “It was first introduced in [76], and the method determines the Hubble parameter data through the differential age evolution of the passively evolving early-type galaxies.”
Holographic dark energy through Tsallis entropy (2018, methodology): “The direct measurements of the Hubble constant is a very powerful implementation in cosmological confrontation, introduced first in [67] with the method determining the Hubble parameter data through the differential age evolution of the passively evolving early-type”