Thought experiments are mental exercises, or imaginative experiments, which are often not possible to perform with current technology. They appear to be particularly popular in physics and philosophy, but are by no means limited to these two fields. There are a couple of thought experiments that employ demons. After all, an imaginary entity with awesome powers can be quite useful in a thought experiment, can’t it?
Three of the most famous thought experiments that center around a demon with amazing capabilities, are:
Descartes’ Evil Demon