$ω=-1$ crossing in quintessence models in Lyra's geometry

Details $ω=-1$ crossing in quintessence models in Lyra's geometry $ω=-1$ crossing in quintessence models in Lyra's geometry

2012-04-16

arxiv.org/abs/1204.3467v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

19 pages, 4 figures

Scientific paper

We study the cosmology of quintessence models in an extended theory of gravity in Lyra's geometry. By analyzing the possible interactions between the quintessence scalar and the intrinsic displacement field in Lyra's geometry, we obtain the closed form solutions of the modified Friedmann equations for four classes of quintessence models. Due to the presence of the geometrical displacement field, a late-time cosmic acceleration with the phantom divide crossing in a flat Robertson-Walker background is possible even if in these models there is no dynamical ghost mode involved.

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