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This paper is concerned with a nonlinear variational sine-Gordon equation utt−c(u)[c(u)ux]x+λ22sin(2u)=0 which describes the motion of long waves on a neutral dipole chain in the continuum limit and a few other physical phenomena. We establish the global existence of an energy-conservative weak solution to its Cauchy problem for initial data of finite energy. To deal with the possible blowup of solutions,...
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