SOLITON-SOLITON AND WAVE-SOLITON COLLISIONS IN SKYRME-LIKE SIGMA-MODELS

A skyrme-like version of the (2 + 1)-dimensional classical sigma-model is considered. Some aspects of soliton-soliton collisions are studied using both the numerical and phenomenological approaches. In particul ar, the problem of 90-degrees scattering of solitons in the head-on co llisions is analyzed. Properties of the two-soliton configurations for upsilon is similar to upsilon(cr) are discussed in terms of a specifi c solution, which may be called a ''disoliton''. This solution corresp onds to a saddle point in the space of field configurations and is uns table with respect to the decay into two weil separated solitons. Diff erent classes of field configurations, which may be called ''one-dimen sional'' wave packets, are also studied as well as the interaction of these wave packets with a soliton.