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On the decay in time of solutions of some generalized regularized long waves equations
We consider the generalized Benjamin-Ono equation,
regularized in the same manner that the Benjamin-Bona-Mahony equation is found from
the Korteweg-de Vries equation [3], namely the equation
$u_t + u_x +u^\rho u_x + H(u_{x t})=0,$ where $H$ is the Hilbert transform.
In a second time, we consider the generalized Kadomtsev-Petviashvili-II equation,
also regularized, namely the equation
$u_t + u_x +u^\rho u_x - u_{x x t} +\partial_x^{-1}u_{y y} =0$.
We are interested in
dispersive properties of these equations for small initial data. We
will show that, if the power $\rho$ of the nonlinearity is higher than $3$,
the respective solution of these equations tends to zero when time rises with a decay rate
of order close to $\frac{1}{2}$.