论文标题
来自非对称薄壳虫洞的新颖阴影
Novel shadows from the asymmetric thin-shell wormhole
论文作者
论文摘要
对于黑洞或虫洞等深色紧凑物体，长期以来，阴影大小一直被认为是由不稳定的光子球（区域）确定的。然而，通过考虑不对称的薄壳虫洞（ATSW）模型，我们发现无效的大地测量学的影响参数通常通过虫洞不连续，因此我们确定了新颖的阴影，其大小的尺寸取决于光子球的另一侧。新颖的阴影出现在三种情况下：（a2）观察者的时空包含一个光子球，质量参数小于另一侧； （B1，B2）无论哪个质量参数更大，都没有光子球。特别是，与黑洞相比，虫洞的阴影尺寸总是较小，并且在大多数情况下它们的差异很大，这提供了一种潜在的方法，可以通过事件地平线望远镜直接观察虫洞，并在将来具有更好的检测能力。
For dark compact objects such as black holes or wormholes, the shadow size has long been thought to be determined by the unstable photon sphere (region). However, by considering the asymmetric thin-shell wormhole (ATSW) model, we find that the impact parameter of the null geodesics is discontinuous through the wormhole in general and hence we identify novel shadows whose sizes are dependent of the photon sphere in the other side of the spacetime. The novel shadows appear in three cases: (A2) The observer's spacetime contains a photon sphere and the mass parameter is smaller than that of the opposite side; (B1, B2) there' s no photon sphere no matter which mass parameter is bigger. In particular, comparing with the black hole, the wormhole shadow size is always smaller and their difference is significant in most cases, which provides a potential way to observe wormholes directly through Event Horizon Telescope with better detection capability in the future.
