Abstract
In this paper, the cosmological evolution of new agegraphic dark energy (NADE) model is analyzed in Brans-Dicke theory within the framework of Friedmann-Robertson-Walker Universe. The power-law assumption on Brans-Dicke scalar field is reconsidered by assuming the logarithmic form. We derive the equation of state parameter \(w_{D}\) and deceleration parameter \(q\) of NADE model. It is observed that \(w_{D}\rightarrow -1\) when \(a\rightarrow \infty \), i.e., the NADE mimics cosmological constant in the late time evolution. Indeed, due to the assumption of logarithmic form of Brans-Dicke scalar field the NADE in Brans-Dicke theory behaves like NADE in general relativity in the late time evolution. The NADE model shows a phase transition from matter dominated phase in early time to accelerated phase in late time. We further extend NADE model by including the interaction between dark matter and NADE. In this case, \(w_{D}\) definitely crosses the phantom divide line (\(w_{D}=-1\)) in the late time evolution. The phase transition from matter dominated to NADE dominated phase may be achieved at early stage in interacting model. Further, we show that the interacting NADE model resolves the cosmic coincidence problem as the energy density ratio may evolve sufficiently slow at present.
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The authors are thankful to the referee for his constructive suggestions to improve the manuscript. PK also expresses his thanks to UGC, India for providing the financial support to carry out the research under Senior Research Fellowship (SRF).
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Kumar, P., Singh, C.P. New agegraphic dark energy model in Brans-Dicke theory with logarithmic form of scalar field. Astrophys Space Sci 362, 52 (2017). https://doi.org/10.1007/s10509-017-3032-0
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DOI: https://doi.org/10.1007/s10509-017-3032-0