Viable cosmological histories with transient matter/radiation eras and late acceleration exist only in restricted parameter regions for hybrid potentials and are confined to an invariant plane where the accelerated point attracts only positive scalar field values.
Cosmology with negative potentials
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Viable Cosmological Solutions from Hybrid Potentials
Viable cosmological histories with transient matter/radiation eras and late acceleration exist only in restricted parameter regions for hybrid potentials and are confined to an invariant plane where the accelerated point attracts only positive scalar field values.