Weak lensing probes of modified gravity

By F. Schmidt. 2008

141 citations recorded by the source corpus.

We study the effect of modifications to general relativity on large-scale weak lensing observables. In particular, we consider three modified gravity scenarios: f(R) gravity, the Dvali-Gabadadze-Porrati model, and tensor-vector-scalar theory. Weak lensing is sensitive to the growth of structure and the relation between matter and gravitational potentials, both of which will in general be affected by modified gravity. Restricting ourselves to linear scales, we compare the predictions for galaxy-shear and shear-shear correlations of each modified gravity cosmology to those of an effective dark energy cosmology with the same expansion history. In this way, the effects of modified gravity on the growth of perturbations are separated from the expansion history. We also propose a test which isolates the matter-potential relation from the growth factor and matter power spectrum. For all three modified gravity models, the predictions for galaxy and shear correlations will be discernible from those of dark energy with very high significance in future weak lensing surveys. Furthermore, each model predicts a measurably distinct scale dependence and redshift evolution of galaxy and shear correlations, which can be traced back to the physical foundations of each model. We show that the signal-to-noise for detecting signatures of modified gravity is much highermore » for weak lensing observables as compared to the integrated Sachs-Wolfe effect, measured via the galaxy-cosmic microwave background cross-correlation.« less

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/6c984ac7fd570e75f9ff0e14c7b145feb31cf595

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Citations in the corpus

Probing the theory of gravity with gravitational lensing of gravitational waves and galaxy surveys (2019, background): “(9) (Carroll et al. 2006; Bean et al. 2007; Hu & Sawicki 2007; Schmidt 2008; Silvestri et al. 2013; Baker et al. 2015; Lombriser & Taylor 2016; Lombriser & Lima 2017; Saltas et al. 2014; Baker & Bull 2015; Slosar et al. 2019) such as (i) g(k, z) 6= 0, (ii) the modified Poisson Equation, (iii)…”
Evidence of the accelerated expansion of the Universe from weak lensing tomography with COSMOS (2009, background): “Being sensitive to both effects, weak lensing is a powerful probe of dark energy properties, also providing important tests fortheories of modified gravity (e.g. Benabed & Bernardeau 2001; Benabed & van Waerbeke 2004; Schimd et al. 2007; Doré et al. 2007; Jain & Zhang 2008; Schmidt 2008).”
The Intrinsic Alignment of Galaxies and its Impact on Weak Gravitational Lensing in an Era of Precision Cosmology (2014, background): “…(2006); Zhao et al. (2006); Huterer and Linder (2007); Linder and Cahn (2007); Zhang et al. (2007); Acquaviva et al. (2008); Daniel et al. (2008); Schmidt (2008); Tsujikawa and Tatekawa (2008); Beynon et al. (2010); Fu et al. (2009); Hearin and Zentner (2009); Ishak and Dossett (2009); Song and…”
f(R) Theories (2010, methodology): “Since the evolution of matter perturbations and gravitational potentials is different from that of GR, the observations of weak lensing can provide us an important test for probing modified gravity on galactic scales (see [2, 527, 27, 595, 528, 548] for theoretical aspects and [546, 348, 322, 3, 629”
Numerical simulations of the dark universe: State of the art and the next decade (2012, unknown): “constrain DE and modified gravity [221].”