Main point.

>When time is expressed in units of orbital or thermal timescale in thin-disk models, we find a universal structure function, independent of luminosity and wavelength, supporting the model of magneto-rotational instabilities as a main cause.

ELI5 ChatGPT

>Scientists study the patterns of spinning things in space like planets around stars. They found out that these spinning things sometimes flicker, which means they change brightness quickly. This happens because of something called "magneto-rotational instabilities." It's like when two magnets push and pull each other and make patterns. The spinning things in space also do this and it causes them to flicker. No matter how bright or what color the spinning thing is, the flicker patterns always look the same.

Close enough

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Lay read: https://theconversation.com/why-do-black-holes-twinkle-we-studied-5-000-star-eating-behemoths-to-find-out-198996

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...so nor due to refraction?

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