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arXiv 2209.01133hep-thgr-qc
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具有 Robin 边界条件的三维反德西特时空上的真空极化

Vacuum polarization on three-dimensional anti-de Sitter space-time with Robin boundary conditions

Sivakumar Namasivayam, Elizabeth Winstanley

AI总结:

本文研究三维全局反德西特时空中一般质量与曲率耦合的量子标量场,计算 Dirichlet、Neumann 与 Robin 边界条件下真空极化的真空及热期望值,并揭示其有限性、对称性和边界收敛行为。

摘要:

我们研究一个量子标量场,其具有一般质量以及与标量曲率的一般耦合,并在三维全局反德西特时空上传播。我们确定了场平方的真空和热期望值,也称为真空极化(VP)。我们考虑标量场质量和耦合的若干取值,对于这些取值,可以选择能给出适定经典动力学的边界条件。我们在时空边界上对该场施加 Dirichlet、Neumann 和 Robin(混合)边界条件。当控制 Robin 边界条件的参数低于某个临界值时,我们发现 VP 取有限值。对于所有耦合,采用 Neumann 或 Dirichlet 边界条件时 VP 的真空期望值都是常数,并尊重背景时空的最大对称性。然而,Robin 边界条件并非如此,此时真空和热期望值都依赖于时空位置。在时空边界处,我们发现采用 Robin 边界条件时 VP 的真空和热期望值都收敛到施加 Neumann 边界条件时的结果,但 Dirichlet 边界条件的情形除外。

英文摘要:

We study a quantum scalar field, with general mass and coupling to the scalar curvature, propagating on three-dimensional global anti-de Sitter space-time. We determine the vacuum and thermal expectation values of the square of the field, also known as the vacuum polarisation (VP). We consider values of the scalar field mass and coupling for which there is a choice of boundary conditions giving well-posed classical dynamics. We apply Dirichlet, Neumann and Robin (mixed) boundary conditions to the field at the space-time boundary. We find finite values of the VP when the parameter governing the Robin boundary conditions is below a certain critical value. For all couplings, the vacuum expectation values of the VP with either Neumann or Dirichlet boundary conditions are constant and respect the maximal symmetry of the background space-time. However, this is not the case for Robin boundary conditions, when both the vacuum and thermal expectation values depend on the space-time location. At the space-time boundary, we find that both the vacuum and thermal expectation values of the VP with Robin boundary conditions converge to the result when Neumann boundary conditions are applied, except in the case of Dirichlet boundary conditions.

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