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20 April 2024 |
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Gluon condensate, modified gravity, and the accelerating Universe | | F.R. Klinkhamer
; | | Date: |
21 Apr 2009 | | Abstract: | The dynamics of a gravitating gluon condensate q is studied in the context of
a spatially flat Friedmann-Robertson-Walker universe. With a quadratic
approximation of the gluon-condensate vacuum energy density
ho_{V}(q) near
the equilibrium value q_{0} and a small modified-gravity coupling constant eta
of a nonanalytic ilde{f}(R,q) term in the action, an "accelerating universe"
is obtained which more or less resembles the present Universe. The unknown
component ’X’ of this model universe (here, due to the combined effects of
vacuum energy density and modified gravity) has an effective equation-of-state
parameter ar{w}_{X} which is found to evolve towards the value -1 from above. | | Source: | arXiv, 0904.3276 | | Services: | Forum | Review | PDF | Favorites | |
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