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|metadata.artigo.dc.title:||Scattering and bound states of a spin-1/2 neutral particle in the cosmic string spacetime|
|metadata.artigo.dc.creator:||Andrade, Fabiano M.|
Silva, Edilberto O.
|metadata.artigo.dc.subject:||Relativistic quantum dynamics|
Dirac delta function
Dinâmica quântica relativista
Função delta de Dirac
|metadata.artigo.dc.identifier.citation:||ANDRADE, F. M.; FILGUEIRAS, C.; SILVA, E. O. Scattering and bound states of a spin-1/2 neutral particle in the cosmic string spacetime. Advances in High Energy Physics, [S. l.], v. 2017, p. 1-7, 2017. doi: https://doi.org/10.1155/2017/8934691.|
|metadata.artigo.dc.description.abstract:||In this paper the relativistic quantum dynamics of a spin-1/2 neutral particle with a magnetic moment 𝜇 in the cosmic string spacetime is reexamined by applying the von Neumann theory of self-adjoint extensions. Contrary to previous studies where the interaction between the spin and the line of charge is neglected, here we consider its effects. This interaction gives rise to a point interaction: ∇⋅ E = (2𝜆/𝛼)𝛿(𝑟)/𝑟. Due to the presence of the Dirac delta function, by applying an appropriated boundary condition provided by the theory of self-adjoint extensions, irregular solutions for the Hamiltonian are allowed. We address the scattering problem obtaining the phase shift, 𝑆-matrix, and the scattering amplitude. The scattering amplitude obtained shows a dependency with energy which stems from the fact that the helicity is not conserved in this system. Examining the poles of the 𝑆-matrix we obtain an expression for the bound states.The presence of bound states for this system has not been discussed before in the literature.|
|Appears in Collections:||DFI - Artigos publicados em periódicos|
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