A beyond Horndeski theory is considered that admits wormholes, black holes and naked singularities. In this theory the shadow images of the black holes and the exotic compact objects (ECOs), illuminated by an optically and geometrically thin disk, are investigated. The results show that the three kinds of objects cast unlike shadow images, in particular, because the different objects possess a different number of light rings. The different boundaries of the accretion disk also affect the images. This may provide further insight into the nature of the shadow images of massive compact objects.

中文翻译：

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超越 Horndeski 理论的致密物体的阴影图像

超越霍恩德斯基理论被认为承认虫洞、黑洞和裸奇点。在这个理论中，研究了由光学和几何薄盘照亮的黑洞和奇异致密天体（ECO）的阴影图像。结果表明，这三种物体投射的阴影图像与阴影图像不同，特别是因为不同的物体具有不同数量的光环。吸积盘的不同边界也会影响图像。这可以进一步了解大规模致密物体的阴影图像的性质。