A Comparative Test of the LCDM and R_h=ct Cosmologies Based on Upcoming Redshift Drift Measurements

Abstract

A measurement of the redshift drift constitutes a model-independent probe of fundamental cosmology. Several approaches are being considered to make the necessary observations, using (i) the Extremely Large Telescope (ELT), (ii) the Cosmic Accelerometer, and (iii) the differential redshift drift methodology. Our focus in this {\it Letter} is to assess how these upcoming measurements may be used to compare the predictions of $\Lambda$CDM with those of the alternative Friedmann-Lemaître-Robertson-Walker cosmology known as the $R_{\mathrm{h}}=ct$ universe, and several other models, including modified gravity scenarios. The ELT should be able to distinguish between $R_{\mathrm{h}}=ct$ and the other models at better than $3\sigma$ for $z\gtrsim 3.6$ after 20 years of monitoring, while the Cosmic Accelerometer may be able to achieve the same result with sources at $z\gtrsim 2.6$ after only 10 years.

8 pages, 5 figures, published in EPL

References in corpus (17)

• Extra force in $f(R)$ modified theories of gravity
• f(R,L_m) gravity
• Two Remarkably Luminous Galaxy Candidates at $z\approx 10-12$ Revealed by JWST
• The evolution of the galaxy UV luminosity function at redshifts z ~ 8-15 from deep JWST and ground-based near-infrared imaging
• The GLASS James Webb Space Telescope Early Release Science Program. I. Survey Design and Release Plans
• Cosmic dynamics in the era of Extremely Large Telescopes
• The JWST Early Release Observations
• Observational constraints on two cosmological models of $f(Q)$ theory
• Exploring the Dark Energy Redshift Desert with the Sandage-Loeb Test
• The ACCELERATION programme: I. Cosmology with the redshift drift
• Cosmological impact of redshift drift measurements
• Thermodynamics of the R_h=ct Universe: A Simplification of Cosmic Entropy
• Quantum Fluctuations at the Planck Scale
• Missing large-angle correlations versus even-odd point-parity imbalance in the cosmic microwave background
• A Resolution of the Monopole Problem in the R_h=ct Universe
• The Scale of Homogeneity in the $R_h=ct$ Universe
• Model Selection with Baryonic Acoustic Oscillations in the Lyman-alpha Forest