• periodic and homoclinic travelling waves in infinite lattices

    نویسندگان :
    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 472
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
    consider an infinite chain of particles subjected to a potential f , where nearest neighbours are connected by nonlinear oscillators. the nonlinear coupling between particles is given by a potential v. the dynamics of the system is described by the infinite system of second order differential equations

    ¨qj + f ′(qj) = v′(qj+1 − qj) − v′(qj − qj−1), j ∈ z.

    we investigate the existence of travelling wave solutions. two kinds of such solutions are studied: periodic and homoclinic ones. on one hand, we prove under some growth conditions on f and v, the existence of non-constant periodic solutions of any given period t > 0, and speed c > c0, where the constant c0 depends on f ′′(0) and v′′(0). on the other hand, under very similar conditions, we establish the existence of non-trivial homoclinic solutions, of any given speed c > c0, emanating from the origin. moreover, we prove that these homoclinics decay exponentially at infinity. each homoclinic is obtained as a limit of periodic solutions when the period goes to infinity.

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