Analysis reveals no global weak solutions of Klein-Gordon equations in Friedmann-Lemaître-Robertson-Walker spacetimes, highlighting gauge variant influences.
Nonexistence of global weak solutions of Klein-Gordon equations with gauge variant semilinear terms are considered in Friedmann-Lema\^itre-Robertson-Walker spacetimes. Effects of spatial expansion or contraction on the solutions are studied through the scale-function and the curved mass.
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Nakamura et al. (2025) studied this question.
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