The time evolution of cosmological redshift as a test of dark energy

Abstract

The variation of the expansion rate of the Universe with time produces an evolution in the cosmological redshift of distant sources (for example quasar Lyman-$\alpha$ absorption lines), that might be directly observed by future ultra stable, high-resolution spectrographs (such as CODEX) coupled to extremely large telescopes (such as European Southern Observatory's Extremely Large Telescope, ELT). This would open a new window to explore the physical mechanism responsible for the current acceleration of the Universe. We investigate the evolution of cosmological redshift from a variety of dark energy models, and compare it with simulated data. We perform a Fisher matrix analysis and discuss the prospects for constraining the parameters of these models and for discriminating among competing candidates. We find that, because of parameter degeneracies, and of the inherent technical difficulties involved in this kind of observations, the uncertainties on parameter reconstruction can be rather large unless strong external priors are assumed. However, the method could be a valuable complementary cosmological tool, and give important insights on the dynamics of dark energy, not obtainable using other probes.

9 pages, 2 figures. Matching published version

References in corpus (4)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• New Hubble Space Telescope Discoveries of Type Ia Supernovae at z > 1: Narrowing Constraints on the Early Behavior of Dark Energy
• Exploring the Dark Energy Redshift Desert with the Sandage-Loeb Test
• Testing the LCDM model (and more) with the time evolution of the redshift

Cited by in corpus (24)

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• Redshift drift in a pressure-gradient cosmology
• Parameter estimation with Sandage-Loeb test
• Redshift drift cosmography with ELT and SKAO measurements
• Redshift drift constraints on holographic dark energy
• Redshift drift cosmography for model-independent cosmological inference
• Quantifying the impact of future Sandage-Loeb test data on dark energy constraints
• Redshift Drift in $f(R,T)$ Gravity
• A new class of holographic dark energy models in LRS Bianchi Type-I
• A critical assessment of some inhomogeneous pressure Stephani models
• The Instantaneous Redshift Difference of Gravitationally Lensed Images: Theory and Observational Prospects
• Redshift drift in a universe with structure II: Light rays propagated through a Newtonian N-body simulation
• Toward a direct measurement of the cosmic acceleration: The pilot observation of H I 21cm absorption line at FAST
• The effect of our local motion on the Sandage-Loeb test of the cosmic expansion
• Fundamental cosmology from ANDES precision spectroscopy
• Redshift drift effect through the observation of HI 21cm signal with SKA
• Dynamical analysis of the redshift drift in FLRW universes
• Expected redshift drift for tilted observers
• Estimating constraints on cosmological parameters via the canonical and the differential redshift drift with SKA HI 21-cm observations