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arXiv 0907.1149hep-thgr-qcquant-ph
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de Sitter时空中板块的Casimir密度

Casimir densities for a plate in de Sitter spacetime

A. A. Saharian, T. A. Vardanyan

摘要:

研究了deSitter时空中平板几何中具有一般曲率耦合参数的标量场的Wightman函数、场平方的真空期望值和能量动量张量.场算子的Robin边界条件被假定在平板上。真空期望值表示为两项之和。第一个对应于deSitter体无边界的几何形状,第二个是由板的存在引起的。我们表明,对于非共形场的真空能量动量张量是非对角的非对角分量对应的能量通量沿垂直于板的方向。根据参数,该通量可以是正的或负的。研究了近场和远场的场平方、真空能量密度和应力的渐近行为。

英文摘要:

Wightman function, the vacuum expectation values of the field squared and the energy-momentum tensor are investigated for a scalar field with general curvature coupling parameter in the geometry of a plate in the de Sitter spacetime. Robin boundary condition for the field operator is assumed on the plate. The vacuum expectation values are presented as the sum of two terms. The first one corresponds to the geometry of de Sitter bulk without boundaries and the second one is induced by the presence of the plate. We show that for non-conformal fields the vacuum energy-momentum tensor is non-diagonal with the off-diagonal component corresponding to the energy flux along the direction perpendicular to the plate. In dependence of the parameters, this flux can be either positive or negative. The asymptotic behavior of the field squared, vacuum energy density and stresses near the plate and at large distances is investigated.

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