Journal of High Energy Physics

, 2019:161 | Cite as

Manifestly finite derivation of the quantum kink mass

  • Jarah EvslinEmail author
Open Access
Regular Article - Theoretical Physics


In 1974 Dashen, Hasslacher and Neveu calculated the leading quantum correction to the mass of the kink in the scalar ϕ4 theory in 1+1 dimensions. The derivation relies on the identification of the perturbations about the kink as solutions of the Pöschl-Teller (PT) theory. They regularize the theory by placing it in a periodic box, although the kink is not itself periodic. They also require an ad hoc identification of plane wave and PT states which is difficult to interpret in the decompactified limit. We rederive the mass using the kink operator to recast this problem in terms of the PT Hamiltonian which we explicitly diagonalize using its exact eigenstates. We normal order from the beginning, rendering our theory finite so that no compactification is necessary. In our final expression for the kink mass, the form of the PT potential disappears, suggesting that our mass formula applies to other quantum solitons.


Solitons Monopoles and Instantons Field Theories in Lower Dimensions Nonperturbative Effects 


Open Access

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© The Author(s) 2019

Authors and Affiliations

  1. 1.Institute of Modern PhysicsLanzhouChina
  2. 2.China University of the Chinese Academy of SciencesBeijingChina

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