Probing cosmic acceleration beyond the equation of state: Distinguishing between dark energy and modified gravity models

By M. Ishak, A. Upadhye, David Dallas, P. University.. 2005

209 citations recorded by the source corpus.

If general relativity is the correct theory of physics on large scales, then there is a differential equation that relates the Hubble expansion function, inferred from measurements of angular diameter distance and luminosity distance, to the growth rate of large scale structure. For a dark energy fluid without couplings or an unusual sound speed, deviations from this consistency relationship could be the signature of modified gravity on cosmological scales. We propose a procedure based on this consistency relation in order to distinguish between some dark energy models and modified gravity models. The procedure uses different combinations of cosmological observations and is able to find inconsistencies when present. As an example, we apply the procedure to a universe described by a recently proposed 5-dimensional modified gravity model. We show that this leads to an inconsistency within the dark energy parameter space detectable by future experiments.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/376713ad12cdea7cc36f41664f00ac9947b449b0

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

Citations in the corpus

Cosmological tests of modified gravity (2015, methodology): “Thus if our universe were described by a modified gravity model but we tried to fit various observations including those measuring the background expansion of the Universe and the growth of the structure, we would find inconsistencies [210, 211].”
The effective field theory of dark energy (2012, background): “short, DE) on the basis of dynamical and clustering properties [4].”
Cosmology and Fundamental Physics with the Euclid Satellite (2012, background): “, [11, 634]), couplings in the dark sector (e.”
SEVEN-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE (WMAP) OBSERVATIONS: COSMOLOGICAL INTERPRETATION (2010, background): “…with the amplitude of matter density fluctuations in a low redshift universe, one may distinguish between dark energy and modified gravity (Ishak et al. 2006; Koyama & Maartens 2006; Amarzguioui et al. 2006; Doré et al. 2007; Linder & Cahn 2007; Upadhye 2007; Zhang et al. 2007; Yamamoto…”
FIVE-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE OBSERVATIONS: COSMOLOGICAL INTERPRETATION (2008, unknown): “The amplitude of fluctuations is a powerful tool for distinguishing between dark energy and modifications to gravity (Ishak et al. 2006; Koyama & Maartens 2006; Amarzguioui et al. 2006; Doré et al. 2007; Linder & Cahn 2007; Upadhye 2007; Zhang et al. 2007; Yamamoto et al. 2007; Chiba & Takahashi…”
The Intrinsic Alignment of Galaxies and its Impact on Weak Gravitational Lensing in an Era of Precision Cosmology (2014, background): “…be a powerful probe to test general relativity and modified gravity theories at cosmological scales (e.g., Song (2005); Capozziello et al. (2006); Ishak et al. (2006); Zhao et al. (2006); Huterer and Linder (2007); Linder and Cahn (2007); Zhang et al. (2007); Acquaviva et al. (2008); Daniel et…”