Searching for signals of inhomogeneity using multiple probes of the cosmic expansion rate H(z)

Abstract

It is argued that cosmic chronometers yield estimates of the spatially averaged expansion rate even in a universe that is not well described by a global FLRW model - as long as the Universe is statistically homogeneous and isotropic with a sufficiently small homogeneity scale. On the other hand, measurements of the expansion rate based on observations of redshift drift will not in general yield estimates of the spatially averaged expansion rate - but it will in the case where the universe is described well by a single FLRW model on large scales. Therefore, a disagreement between measurements of the expansion rate based on cosmic chronometers versus redshift drift is an expected signal of non-negligible cosmic backreaction.

6 pages, 2 captioned figures. Accepted for publication in PRL

References in corpus (22)

• Raising the bar: new constraints on the Hubble parameter with cosmic chronometers at z$\sim$2
• Planck evidence for a closed Universe and a possible crisis for cosmology
• Curvature tension: evidence for a closed universe
• Setting the Stage for Cosmic Chronometers. II. Impact of Stellar Population Synthesis Models Systematics and Full Covariance Matrix
• A general test of the Copernican Principle
• Cosmic dynamics in the era of Extremely Large Telescopes
• Investigating Cosmic Discordance
• Dipole of the luminosity distance: a direct measure of H(z)
• Exploring the Dark Energy Redshift Desert with the Sandage-Loeb Test
• Multipole decomposition of the general luminosity distance 'Hubble law' -- a new framework for observational cosmology
• Tracing the redshift evolution of Hubble parameter with gravitational-wave standard sirens
• Solving the curvature and Hubble parameter inconsistencies through structure formation-induced curvature
• Another look at redshift drift and the backreaction conjecture
• Observations in statistically homogeneous, locally inhomogeneous cosmological toy-models without FLRW backgrounds
• Does small scale structure significantly affect cosmological dynamics?
• Accelerated expansion without dark energy
• Redshift drift as a model independent probe of dark energy
• Multipole decomposition of redshift drift -- model independent mapping of the expansion history of the Universe
• Towards statistically homogeneous and isotropic perfect fluid universes with cosmic backreaction
• On the relationship between mean observations, spatial averages and the Dyer-Roeder approximation in Einstein-Straus models
• Constraining Models of Dark Energy
• Real time cosmology - A direct measure of the expansion rate of the Universe

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• Unveiling the Universe with Emerging Cosmological Probes
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