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Abstract
In General Relativity, the constraint equation relating metric and density perturbations is inherently nonlinear, leading to an effective nonGaussianity in the dark matter density field on large scales  even if the primordial metric perturbation is Gaussian. Intrinsic nonGaussianity in the largescale dark matter overdensity in GR is real and physical. However, the variance smoothed on a local physical scale is not correlated with the largescale curvature perturbation, so that there is no relativistic signature in the galaxy bias when using the simplest model of bias. It is an open question whether the observable mass proxies such as luminosity or weak lensing correspond directly to the physical mass in the simple halo bias model. If not, there may be observables that encode this relativistic signature.
Original language  English 

Pages (fromto)  3034 
Journal  Physics of the Dark Universe 
Volume  13 
Early online date  12 Apr 2016 
DOIs  
Publication status  Published  Sep 2016 
Keywords
 astroph.CO
 grqc
 RCUK
 STFC
 ST/K00090X/1
 ST/L005573/1
 General Relativity
 Largescale perturbations
 NonGaussianity
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 1 Finished
Press / Media

Relativistic codes reveal a clumpy universe
27/06/16 → 28/06/16
2 items of Media coverage
Press/Media: Research