Revisiting Ryskin's Model of Cosmic Acceleration

Abstract

Cosmic backreaction as an additional source of the expansion of the universe has been a debate topic since the discovery of cosmic acceleration. The major concern is whether the self interaction of small-scale nonlinear structures would source gravity on very large scales. Gregory Ryskin argued against the additional inclusion of gravitational interaction energy of astronomical objects, whose masses are mostly inferred from gravitational effects and hence should already contain all sources with long-range gravity forces. Ryskin proposed that the backreaction contribution to the energy momentum tensor is instead from the rest of the universe beyond the observable patch. Ryskin's model elegantly solves the fine-tuning problem and is in good agreement with the Hubble diagram of Type Ia supernovae. In this article we revisit Ryskin's model and show that it is {\it inconsistent} with at least one of the following statements: (i) the universe is matter-dominated at low redshift ($z\lesssim 2$); (ii) the universe is radiation-dominated at sufficiently high redshift; (iii) matter density fluctuations are tiny ($\lesssim 10^{-4}$) at the recombination epoch.

arXiv comment7 pages; 2 figures; submitted to Astroparticle Physics

References in corpus (23)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• Planck 2015 results. XIII. Cosmological parameters
• Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Parameter Results
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Preliminary Maps and Basic Results
• Large Magellanic Cloud Cepheid Standards Provide a 1% Foundation for the Determination of the Hubble Constant and Stronger Evidence for Physics Beyond LambdaCDM
• The Cosmic Microwave Background Spectrum from the Full COBE/FIRAS Data Set
• A gravitational-wave standard siren measurement of the Hubble constant
• Planck 2013 results. XX. Cosmology from Sunyaev-Zeldovich cluster counts
• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Are There Cosmic Microwave Background Anomalies?
• On average properties of inhomogeneous fluids in general relativity I: dust cosmologies
• New Parallaxes of Galactic Cepheids from Spatially Scanning the Hubble Space Telescope: Implications for the Hubble Constant
• Planck 2015 results. XXIV. Cosmology from Sunyaev-Zeldovich cluster counts
• Dark Energy Survey Year 1 Results: Constraints on Extended Cosmological Models from Galaxy Clustering and Weak Lensing
• The non-Gaussian Cold Spot in the 3-year WMAP data
• The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: RSD measurement from the LOS-dependent power spectrum of DR12 BOSS galaxies
• The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: BAO measurement from the LOS-dependent power spectrum of DR12 BOSS galaxies
• Observational Challenges for the Standard FLRW Model
• Density split statistics: Cosmological constraints from counts and lensing in cells in DES Y1 and SDSS data
• The tangential velocity excess of the Milky Way satellites
• Inhomogeneous cosmology and backreaction: Current status and future prospects
• The emergence of cosmic repulsion
• Is the Cosmological Constant Problem Properly Posed?

Cited by in corpus (1)

• Evidence against Ryskin's model of cosmic acceleration