Background-inert modified-gravity couplings create a σ80–λ degeneracy under compressed CMB priors, inflating σ80 and producing spurious model preference, which an implied-A_s diagnostic exposes.
The observable $E_g$ statistics
2 Pith papers cite this work, alongside 13 external citations. Polarity classification is still indexing.
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abstract
Recently Moradinezhad Dizgah & Durrer have shown that the $E_g$ statistics, useful to test theories of modified gravity, is plagued by additional scale and bias dependent lensing contributions. In this work we develop and illustrate a method to remove these lensing terms by using in addition to the galaxy clustering data also shear data and the correlations of shear and galaxy clustering. We introduce a truly observable statistics termed $\tilde E_g$ which conserves the properties of scale and bias independence on linear scales. The method discussed here is best adapted to photometric surveys. It is found that the corrections to the original $E_g$ statistics are small for the present DES data, but for future surveys of the quality of Euclid they are very substantial.
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The Amplitude-Growth Degeneracy and Implied $A_s$ Diagnostic for Background-Inert Modified Gravity
Background-inert modified-gravity couplings create a σ80–λ degeneracy under compressed CMB priors, inflating σ80 and producing spurious model preference, which an implied-A_s diagnostic exposes.
- Diagnostic Consistency Tests of the Concordance Cosmology