Construction of Exact Solutions in Two-Fields Models and the Crossing of the Cosmological Constant Barrier
Dec, 200616 pages
Published in:
- Teor.Mat.Fiz. 155 (2008) 47-61,
- Theor.Math.Phys. 155 (2008) 544-556
e-Print:
- astro-ph/0612487 [astro-ph]
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Abstract: (arXiv)
A cosmological dark energy model with one phantom scalar field, one usual scalar field and the string field theory inspired polynomial potential has been constructed. A two-parameter set of exact spatially homogeneous solutions to the Friedmann equations has been found. For some values of parameters these solutions correspond to the state parameter at large time, whereas for other values they cross the cosmological constant barrier and have at large time. We demonstrate that the superpotential method is very useful to seek new exact solutions both in the explicit form and in quadratures. We also present a two-fields model with a polynomial potential and the state parameter, which crosses the cosmological barrier infinitely often.- string field theory
- cosmology
- phantom
- dark energy
- exact solution
- superpotential method
- cosmological constant
- dark energy
- field theory: scalar
- cosmological model
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