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28 March 2024 |
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Article overview
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QCD-scale modified-gravity universe | F.R. Klinkhamer
; | Date: |
17 May 2010 | Abstract: | A 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 | Services: | Forum | Review | PDF | Favorites |
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