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28 March 2024
 
  » arxiv » 1005.2885

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QCD-scale modified-gravity universe
F.R. Klinkhamer ;
Date 17 May 2010
AbstractA possible gluon-condensate-induced modified-gravity model with f(R) propto |R|^{1/2} has been suggested previously. Here, a simplified version is presented using the constant flat-spacetime equilibrium value of the QCD gluon condensate and a single pressureless matter component (cold dark matter). The dynamical equations of a homogeneous spatially-flat Friedmann-Robertson-Walker universe are derived for this simple model. The simple model allows for a careful treatment of the boundary conditions and does not require a further scaling analysis as the original model did. Reliable predictions are obtained for several observable quantities of the homogeneous model universe. In addition, the estimator E_{G}, proposed by Zhang et al. to search for deviations from standard Einstein gravity, is calculated for linear sub-horizon density perturbations.
Source arXiv, 1005.2885
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