Some Cosmological Models with Negative Potentials
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We investigate some cosmological models where the effective potential V (ϕ) may become negative for some values of field ϕ. Cosmological evolution in models with a minimum at V (ϕ) < 0 is similar in some respects to the evolution in models with potentials unbounded from below. In this case, instead of reaching an AdS regime dominated by the negative vacuum energy, the universe may reach a turning point where its energy density vanishes, and then it contracts to a singularity. In some cases such models may lead to a bounce.
KeywordsCosmological model Negative Potential Bounce
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