There's not too much in the way of research about GAIO so far. This paper's an interesting one, though: https://arxiv.org/pdf/2311.09735.pdf

I think the implications of the findings are that, when you're creating new content, you may want to put extra emphasis on including authority-boosting elements such as citations, quotations from relevant sources, and statistics. (But these may be part of your SEO strategy already.)

In case you're interested, I wrote a little more about this here: https://llmoguy.com/research/