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- W2964223775 abstract "It is known that infrared (IR) quantum fluctuations in de Sitter space could break the de Sitter symmetry and generate time dependent observable effects. In this paper, we consider a dilaton-gravity theory. We find that gravitational IR effects lead to a time dependent shift on the vev of the dilaton and results in a screening (temporal) of the cosmological constant/Hubble parameter. In the Einstein frame, the effect is exponentiated and can give rises to a much more notable amount of screening. Taking the dilaton as inflaton, we obtain an inflationary expansion of the slow roll kind. This inflation is driven by the IR quantum effects of de Sitter gravity and does not rely on the use of a slow roll potential. As a result, our model is free from the eta problem which baffle the standard slow roll inflation models." @default.
- W2964223775 created "2019-07-30" @default.
- W2964223775 creator A5021263849 @default.
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- W2964223775 date "2015-09-01" @default.
- W2964223775 modified "2023-09-25" @default.
- W2964223775 title "Dilaton, screening of the cosmological constant and IR-driven inflation" @default.
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- W2964223775 doi "https://doi.org/10.1007/jhep09(2015)024" @default.
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