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arXiv 1604.01271hep-thhep-phquant-ph
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超临界库仑势中真空感生电荷的平面密度

Plane density of induced vacuum charge in a supercritical Coulomb potential

V. R. Khalilov, I. V. Mamsurov

摘要:

在坐标空间中,得到了强库仑势下平面感应真空电荷密度的表达式。治疗是基于自伴扩展的方法来构建的格林函数的带电费米子在这个潜在的。计算和分析了亚临界和超临界库仑势下无质量和有质量费米子的真空感生电荷密度。所获得的真空电荷密度的行为进行了研究,在长距离和短距离的库仑中心。感应真空电荷具有屏蔽符号。简要讨论了石墨烯中库仑杂质的筛选。我们计算了在超临界库仑势中由于所谓的真实真空极化而获得量子电动力学真空的真实真空极化电荷密度。结果表明,在有质量和无质量的情况下,真空电荷密度有本质的不同。我们希望我们的结果可以,作为一个原则问题,在石墨烯与超临界库仑杂质进行测试。

英文摘要:

An expression for the density of a planar induced vacuum charge is obtained in a strong Coulomb potential in coordinate space. Treatment is based on a self-adjoint extension approach for constructing of the Green's function of a charged fermion in this potential. Induced vacuum charge density is calculated and analyzed at the subcritical and supercritical Coulomb potentials for massless and massive fermions. The behavior of the obtained vacuum charge density is investigated at long and short distances from the Coulomb center. The induced vacuum charge has a screening sign. Screening of a Coulomb impurity in graphene is briefly discussed. We calculate the real vacuum polarization charge density that acquires the quantum electrodynamics vacuum in the supercritical Coulomb potential due to the so-called real vacuum polarization. It is shown that the vacuum charge densities essentially differ in massive and massless cases. We expect that our results can, as a matter of principle, be tested in graphene with a supercritical Coulomb impurity.

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