| Tachyon Cosmology with Gauss–Bonnet and Non-Minimal Kinetic Couplings |
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| 摘 要： | We consider a tachyonic model of dark energy in which scalar field non-minimally coupled with curvature and kinetic part of its Lagrangian density.Additionally the model contains the Gauss–Bonnet coupling to the scalar field through an arbitrary function.The non-minimal Gauss–Bonnet coupling function and scalar field potential have been obtained for power-law solution and then for a dynamically varying equation of state.We have extracted the required condition for the so-called phantom divide line crossing in the model and represented such a crossing numerically.
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| 收稿时间： | 2016-01-04 |
Tachyon Cosmology with Gauss-Bonnet and Non-Minimal Kinetic Couplings |
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| A. Banijamali. Tachyon Cosmology with Gauss-Bonnet and Non-Minimal Kinetic Couplings[J]. Communications in Theoretical Physics, 2016, 65(5): 645-652 |
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| Authors: | A. Banijamali |
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| Affiliation: | Department of Basic Sciences, Babol University of Technology, Babol, Iran |
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| Abstract: | We consider a tachyonic model of dark energy in which scalar field non-minimally coupled with curvature and kinetic part of its Lagrangian density. Additionally the model contains the Gauss-Bonnet coupling to the scalar field through an arbitrary function. The non-minimal Gauss-Bonnet coupling function and scalar field potential have been obtained for power-law solution and then for a dynamically varying equation of state. We have extracted the required condition for the so-called phantom divide line crossing in the model and represented such a crossing numerically. |
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| Keywords: | tachyon field Gauss-Bonnet cosmology non-minimal kinetic coupling crossing of phantom divide |
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