In this overview paper, we show existence of smooth solitary-wave solutions to the nonlinear, dispersive evolution equations of the form
$ \begin{equation*} \partial_t u + \partial_x(\Lambda^s u + u\Lambda^r u^2) = 0, \end{equation*} $
where $ \Lambda^s, \Lambda^r $ are Bessel-type Fourier multipliers. The linear operator may be of low fractional order, $ s>0 $, while the operator on the nonlinear part is assumed to act slightly smoother, $ r<s-1 $. The problem is related to the mathematical theory of water waves; we build upon previous works on similar equations, extending them to allow for a nonlocal nonlinearity. Mathematical tools include constrained minimization, Lion's concentration–compactness principle, spectral estimates, and product estimates in fractional Sobolev spaces.
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