We study relations of the Weierstrass’s hyperelliptic al-functions over a non-degenerated hyperelliptic curve y = f(x) of arbitrary genus g as solutions of sine-Gordon equation using Weierstrass’s local parameters, which are characterized by two ramified points. Though the hyperelliptic solutions of the sine-Gordon equation had already obtained, our derivations of them is simple; they need only...

A method of averaging is applied to study the dynamics of a kink in the damped double sine-Gordon equation driven by both external (nonparametric) and parametric periodic forces at high frequencies. This theoretical approach leads to the study of a double sine-Gordon equation with an effective potential and an effective additive force. Direct numerical simulations show how the appearance of two...

Abstract The primary object of study is the “cosine-sine” functional equation f ( xy ) = x g y )+ h for unknown functions f, g, : S → ℂ, where a semigroup. name refers to fact that it contains both sine and cosine addition laws. This has been solved on groups semigroups generated by their squares. Here we find solutions larger class discuss obstacles finding general solution all semigroups. Exa...

It is shown that the McCall-Hahn theory of self-induced transparency in coherent optical pulse propagation can be identified with the complex sine-Gordon theory in the sharp line limit. We reformulate the theory in terms of the deformed gauged Wess-Zumino-Witten sigma model and address various new aspects of self-induced transparency. 1 E-mail address; [email protected] 2 E-mail address;...