论文标题
各种空间中的弱重力屈曲：异国情调的镜头和修饰的重力
Weak gravitational flexion in various spacetimes: Exotic lenses and modified gravity
论文作者
论文摘要
诸如Ellis虫洞之类的外来物体预计将充当重力透镜。就像他们的非对应物一样，可以通过考虑它们诱导的强和弱的镜头场来找到有关这些镜头的信息。在这项工作中，我们考虑弱重力镜头屈曲如何提供超出剪切的信息。我们发现，定向屈曲可以区分定向剪切不能的正或负收敛的情况，因此可以为具有Ellis蠕虫型度量的物体提供独特的镜头签名。我们还考虑宇宙屈曲，即屈曲相关函数，其信号源自在修饰的重力的背景下，源自宇宙的大规模结构。我们发现屈曲是修饰重力的参数模型的独特探针，尤其是在依赖规模依赖的现象学后的相对性函数的情况下。
Exotic objects such as the Ellis wormhole are expected to act as gravitational lenses. Much like their nonexotic counterparts, information about these lenses can be found by considering the strong and weak lensing fields they induce. In this work, we consider how weak gravitational lensing flexion can provide information beyond that of shear. We find that directional flexion can distinguish between the case of a positive or negative convergence where directional shear cannot, and therefore can provide a unique lensing signature for objects with an Ellis wormhole-type metric. We also consider cosmic flexion, the flexion correlation function whose signal originates from the large-scale structure of the Universe, in the context of modified gravity. We find flexion to be a unique probe of parametric models of modified gravity, particularly in the case of scale-dependent phenomenological post-general relativity functions.
