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We present exact asymptotic similariton solutions of the generalized nonlinear Schrodinger equation (NLSE) with gain or loss terms for a normal-dispersion fiber amplifier with dispersion,… (More)
We derive a one-particle quantum equation for roton excitations by considering rotons as bound states of helium atoms. Our approach is based on a self-similar solution of the nonlinear Schrodinger… (More)