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In our recent study the maximal values of kinetic and potential energydensities that can be achieved in the collisions of $N$ slow kinks in thesine-Gordon model were calculated analytically (for $N=1,2$, and 3) andnumerically (for $4\le N\le 7$). However, for many physical applications it isimportant to know not only the total potential energy density but also its twocomponents (the on-site potential energy density and the elastic strain energydensity) as well as the extreme values of the elastic strain, tensile(positive) and compressive (negative). In the present study we give (i) the twocomponents of the potential energy density and (ii) the extreme values ofelastic strain. Our results suggest that in multi-soliton collisions the maincontribution to the potential energy density comes from the elastic strain, butnot from the on-site potential. It is also found that tensile strain is usuallylarger than compressive strain in the core of multi-soliton collision.

Extreme values of elastic strain and energy in sine-Gordon multi-kink collisions