Almost global existence for the nonlinear Klein-Gordon equation in the nonrelativistic limit
classification
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math-phmath.MP
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equationklein-gordonnonlinearsmallalmostbelongconvolutionexistence
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We study the one-dimensional nonlinear Klein-Gordon (NLKG) equation with a convolution potential, and we prove that solutions with small $H^s$ norm remain small for long times. The result is uniform with respect to $c \geq 1$, which however has to belong to a set of large measure.
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