Abstract
We describe non-flat standard Friedmann cosmology of canonical scalar field with barotropic fluid in form of non-linear Schrödinger-type (NLS) formulation in which all cosmological dynamical quantities are expressed in term of Schrödinger quantities as similar to those in time-independent quantum mechanics. We assume the expansion to be superfast, i.e. phantom expansion. We report all Schrödinger-analogous quantities to scalar field cosmology. Effective equation of state coefficient is analyzed and illustrated. We show that in a non-flat universe, there is no fixed w eff value for the phantom divide. In a non-flat universe, even w eff > −1, the expansion can be phantom. Moreover, in open universe, phantom expansion can happen even with w eff > 0. We also report scalar field exact solutions within frameworks of the Friedmann formulation and the NLS formulation in non-flat universe cases.
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Phetnora, T., Sooksan, R. & Gumjudpai, B. Phantom expansion with non-linear Schrödinger-type formulation of scalar field cosmology. Gen Relativ Gravit 42, 225–240 (2010). https://doi.org/10.1007/s10714-009-0831-9
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DOI: https://doi.org/10.1007/s10714-009-0831-9