2023/12/11 by Hui Liu, Liu, Hui
Engineering · Physics and Astronomy · #Advanced Fiber Optic Sensors #FOS: Physical sciences #High Energy Physics - Theory (hep-th) #Nonlinear Photonic Systems #Photonic Crystal and Fiber Optics
paper · pdf · doi:10.48550/arxiv.2312.06419
openalex publication_date 2023/12/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In this thesis, we first review the linearized soliton perturbation theory developed in recent years, which is particularly simple in the one-kink sector. Using it, the amplitude and probability of kink-meson inelastic scattering can be simplified into a perturbative problem in the kink frame. Although the Sine-Gordon soliton and ϕ4 kink, which people are usually interested in, are both reflectionless kinks, in order to consider more general cases, we study quantum reflective kinks and find that the amplitude of meson wave packets at different positions during propagation corresponds to the reflection and transmission coefficients of particles scattered by symmetric potential barriers or potential wells in quantum mechanics. We calculate the reduced inner product of the kink states to solve the infrared divergence problem of non-normalizable states. Then we consider the inelastic scattering of a meson off of a kink in a (1+1)-dimensional scalar quantum field theory. At leading order there are three inelastic scattering processes: (1) meson multiplication (the final state is two mesons and a kink); (2) Stokes scattering (the final state is a meson and an excited kink); (3) anti-Stokes scattering (the initial kink is excited and the final kink is de-excited). For the first time, we calculate the leading-order probabilities of these three processes and the differential probabilities for final-state mesons with different momenta. We first obtain general results for arbitrary scalar kinks and then apply them to the kinks of the ϕ4 double well model to obtain analytical and numerical results. Finally, we believe that our method can be generalized to higher dimensions, such as the case of monopoles.