Vacuum Polarization in a Zero-Width Potential: Self-Adjoint Extension

Universe

YuriV. Grats¹  Pavel Spirin¹ 

[1] Physics Department, M.V.Lomonosov Moscow State University, Leninskie Gory 1/2, 119991 Moscow, Russia;

关键词: singular potential;    self-adjoint extension;    dimensional regularization;    zero-width interaction;    renormalization;   

DOI  :  10.3390/universe7050127

来源: DOAJ

【 摘 要 】

The effects of vacuum polarization associated with a massless scalar field near pointlike source with a zero-range potential in three spatial dimensions are analyzed. The “physical” approach consists in the usage of direct delta-potential as a model of pointlike interaction. We use the Perturbation theory in the Fourier space with dimensional regularization of the momentum integrals. In the weak-field approximation, we compute the effects of interest. The “mathematical” approach implies the self-adjoint extension technique. In the Quantum-Field-Theory framework we consider the massless scalar field in a 3-dimensional Euclidean space with an extracted point. With appropriate boundary conditions it is considered an adequate mathematical model for the description of a pointlike source. We compute the renormalized vacuum expectation value ${⟨{\varphi }^2\left(x\right)⟩}_{\mathrm{ren}}$ of the field square and the renormalized vacuum averaged of the scalar-field’s energy-momentum tensor ${⟨T_{\mu \nu }\left(x\right)⟩}_{\mathrm{ren}}$. For the physical interpretation of the extension parameter we compare these results with those of perturbative computations. In addition, we present some general formulae for vacuum polarization effects at large distances in the presence of an abstract weak potential with finite-sized compact support.

【 授权许可】

Unknown