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arXiv 2408.01082hep-thgr-qcquant-ph
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具有螺旋紧致维度的模型中的拓扑卡西米尔效应

Topological Casimir effect in models with helical compact dimensions

R. M. Avagyan, A. A. Saharian, D. H. Simonyan, G. H. Harutyunyan

AI总结:

本文研究螺旋紧致维度对带电标量场真空态的影响,通过坐标变换简化问题,并在局部德西特时空中计算拓扑贡献,发现非零非对角能量-动量张量分量等新效应。

摘要:

我们研究了空间维度的螺旋紧致化对具有一般曲率耦合参数的带电标量场真空态局部性质的影响。考虑了一个一般背景几何,在螺旋周期性条件中出现的坐标子空间内具有旋转对称性。研究表明,通过坐标变换,该问题被简化为在同一局部几何中具有标准准周期性条件的问题,且有效紧致半径由紧致维度的长度和螺旋参数决定。作为一般程序的应用,我们考虑了具有螺旋紧致维度的局部德西特时空。通过使用邦奇-戴维斯真空态的哈达玛函数,研究了场平方、电流密度和能量-动量张量的真空期望值。拓扑贡献被明确分离,并描述了它们在宇宙膨胀早期和晚期的渐近行为。与准周期条件问题相比,一个重要的区别是出现了能量-动量张量的非零非对角分量以及沿非紧致维度的电流密度分量。

英文摘要:

We investigate the influence of the helical compactification of spatial dimension on the local properties of the vacuum state for a charged scalar field with general curvature coupling parameter. A general background geometry is considered with rotational symmetry in the subspace with the coordinates appearing in the helical periodicity condition. It is shown that by a coordinate transformation the problem is reduced to the problem with standard quasiperiodicity condition in the same local geometry and with the effective compactification radius determined by the length of the compact dimension and the helicity parameter. As an application of the general procedure we have considered locally de Sitter spacetime with a helical compact dimension. By using the Hadamard function for the Bunch-Davies vacuum state, the vacuum expectation values of the field squared, current density, and energy-momentum tensor are studied. The topological contributions are explicitly separated and their asymptotics are described at early and late stages of cosmological expansion. An important difference, compared to the problem with quasiperiodic conditions, is the appearance of the nonzero off-diagonal component of the energy-momentum tensor and of the component of the current density along the uncompact dimension.

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