Are aliens harvesting the spin of stars?

One of the challenges of searching for technosignatures (i.e., signs that intelligent life somewhere in the universe has created technology) is understanding what to look for. Technology is a very broad area, and different types would show up as different features. One of the most commonly cited is a Dyson sphere, which attempts to encapsulate a star and capture its outgoing light to produce energy. But while we've looked for the mid-infrared waste heat these structures would produce for decades, we haven't found a definitive instance of one. According to a new paper, available as a preprint on arXiv by Turkish high school student Sahin Torlakcik, that might be because we are looking for the wrong type of energy altogether.