通过高强度laser波偏振真空的双折射、二向色性和拉曼光谱寻找微荷电粒子
Searching for minicharged particles via birefringence, dichroism and Raman spectroscopy of the vacuum polarized by a high-intensity laser wave
摘要：
研究了探测光子在强圆偏振激光场中的吸收和色散。应用光学定理确定真空偏振张量虚部的吸收系数。真空折射率和光子吸收系数的紧凑的表达式得到在各种渐近制度的利益。这种分析的结果表明，远离相对接近双光子反应阈值的区域，真空的双折射和二向色性很小，并且在某些情况下被强烈抑制。相反，在光生电子对的区域附近，这些光学性质在中等强度的激光器下表现出来。我们利用这样一个属性在搜索微荷电粒子，考虑高精度的极化实验。此外，拉曼类电磁波产生的非弹性部分的真空极化张量被建议作为替代形式，寻找这些假设的载流子的排斥限制。即将到来的高强度激光设施的设想参数用于建立微带电粒子的上限。
英文摘要：
Absorption and dispersion of probe photons in the field of a high-intensity circularly polarized laser wave are investigated. The optical theorem is applied for determining the absorption coefficients in terms of the imaginary part of the vacuum polarization tensor. Compact expressions for the vacuum refraction indices and the photon absorption coefficients are obtained in various asymptotic regimes of interest. The outcomes of this analysis reveal that, far from the region relatively close to the threshold of the two-photon reaction, the birefringence and dichroism of the vacuum are small and, in some cases, strongly suppressed. On the contrary, in a vicinity of the region in which the photo-production of a pair occurs, these optical properties are manifest with lasers of moderate intensities. We take advantage of such a property in the search of minicharged particles by considering high-precision polarimetric experiments. In addition, Raman-like electromagnetic waves resulting from the inelastic part of the vacuum polarization tensor are suggested as an alternative form for finding exclusion limits on these hypothetical charge carriers. The envisaged parameters of upcoming high-intensity laser facilities are used for establishing upper bounds on the minicharged particles.
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