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- W2056916698 abstract "We study the observational constraints for the axion models in string theory which can successfully act as quintessence. The evolution of the universe in this model is sensitive to the initial value of the axion field. This initial value of the axion field controls deviation of the cosmic evolution from the Lambda CDM behaviour. We use the recent Union2 Supernova Type Ia dataset as well as the data from BAO measurements, the WMAP measurement of the shift parameter and the $H(z)$ measurements. Using these data, the reconstructed equation of state of the axion field has extremely small deviation from the cosmological constant omega = -1 even at 2sigma confidence level. One interesting outcome of this analysis is that one can put bound on the SUSY breaking scale using cosmological measurements assuming the values of different string related parameters and vice versa." @default.
- W2056916698 created "2016-06-24" @default.
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- W2056916698 date "2012-01-04" @default.
- W2056916698 modified "2023-10-17" @default.
- W2056916698 title "Observational constraints on axions as quintessence in string theory" @default.
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- W2056916698 doi "https://doi.org/10.1103/physrevd.85.023501" @default.
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