We consider reflection-asymmetric thin-shell wormholes within Palatini f(R) gravity using a matching procedure of two patches of electrovacuum space-times at a hypersurface (the shell) via suitable junction conditions. The conditions for having (linearly) stable wormholes supported by positive-energy matter sources are determined. We also identify some subsets of parameters able to locate the shell radius above the event horizon (when present) but below the photon sphere (on both sides). We illustrate with an specific example that such two photon spheres allow an observer on one of the sides of the wormhole to see another (circular) shadow in addition to the one generated by its own photon sphere, which is due to the photons passing above the maximum of the effective potential on its side and bouncing back across the throat due to a higher effective potential on the other side. We finally comment on the capability of these double shadows to seek for traces of new gravitational physics beyond that described by General Relativity.

我们考虑在 Palatini f ( R) 重力使用通过合适的结条件在超曲面（壳）处的两个电真空时空补丁的匹配程序。确定了由正能量物质源支持的（线性）稳定虫洞的条件。我们还确定了一些能够定位事件视界上方（如果存在）但光子球下方（两侧）的壳半径的参数子集。我们用一个具体的例子来说明，这两个光子球允许虫洞一侧的观察者看到除了它自己的光子球产生的阴影之外的另一个（圆形）阴影，这是由于光子通过上方由于另一侧的有效电势较高，其一侧的有效电势达到最大值，并在喉部反弹。