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  • tachyonic (phantom) power-law cosmology

    کلمات کلیدی :
    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 842
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     tachyonic scalar field-driven late universe with dust matter content is considered. the cosmic expansion is modeled with power-law and phantom power-law expansion at late time, i.e. z≲0.45. wmap7 and its combined data are used to constraint the model. the forms of potential and the field solution are different for quintessence and tachyonic cases. power-law cosmology model (driven by either quintessence or tachyonic field) predicts unmatched equation of state parameter to the observational value, hence the power-law model is excluded for both quintessence and tachyonic field. in the opposite, the phantom power-law model predicts agreeing valued of equation of state parameter with the observational data for both quintessence and tachyonic cases, i.e. wϕ,0=−1.49+11.64−4.08 (wmap7+bao+h 0) and wϕ,0=−1.51+3.89−6.72 (wmap7). the phantom-power law exponent β must be less than about −6, so that the −2<w ϕ,0<−1. the phantom power-law tachyonic potential is reconstructed. we found that dimensionless potential slope variable γ at present is about 1.5. the tachyonic potential reduced to v=v 0 ϕ −2 in the limit ω m,0→0.

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