The Collision of Two-Kinks Revisited: the Creation of Kinks and Lump-Like Defects as Metastable States

We present a more detailed numerical investigation of the head-on collision of a two-kink/two-antikink system. We identified the escape of oscillon-like configurations as a pair of kinks of the standard phi (4) model moving apart from each other. New pieces of evidence support that the lump-like defects can emerge from the two-kink interaction to form metastable configurations. Moreover, these configurations signalize the windows of escape that have a fractal structure similar to the n-bounce sequence when the kinks of phi (4) interact. As the last piece of the numerical experiment, we show that by perturbing conveniently a lump-like defect, it is possible to recover another lump-like configuration as a metastable configuration.