Abstract
An investigation of those cases of the generalized Friedmann equation which are solvable in terms of elementary or elliptic functions is undertaken together with a study of the time gauges which allow this to occur. This is accomplished by examining the natural choices of independent and dependent variables in this problem using manipulations like those of the Kepler problem, which is shown to be equivalent to a generalized Friedmann problem, thus clarifying the similarities between the simplest solutions of each.
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Jantzen, R.T., Uggla, C. Structure of the generalized Friedmann problem. Gen Relat Gravit 24, 59–85 (1992). https://doi.org/10.1007/BF00756874
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DOI: https://doi.org/10.1007/BF00756874