Cosmological dynamics of D-BIonic and DBI scalar field and coincidence problem of dark energy

  title={Cosmological dynamics of D-BIonic and DBI scalar field and coincidence problem of dark energy},
  author={Sirachak Panpanich and Kei-ichi Maeda and Shuntaro Mizuno},
  journal={Physical Review D},
We study the cosmological dynamics of D-BIonic and DBI scalar field, which is coupled to matter fluid. For the exponential potential and the exponential couplings, we find a new analytic scaling solution yielding the accelerated expansion of the Universe. Since it is shown to be an attractor for some range of the coupling parameters, the density parameter of matter fluid can be the observed value, as in the coupled quintessence with a canonical scalar field. Contrary to the usual coupled… 

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