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SmcWill

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What I don't get is that all the texts/analyses of Friedmann's equation say that if the right hand side is negative it means that the universe will expand reach a critical point and then contract. But if the right hand side is negative doesn't it mean that a dot, the rate of change of the scaling term, is imaginary? Also I don't understand how this squared term can be negative, or even how we can analyze something from it being negative. Thank you!