I been juggling the following three papers for a bit and trying to brush my maths up. I don't know why I feel a hunch between them, but I do know that the hunch is to do with this problem.
I will almost certainly be wrong about whatever it is. However I may have more updates on how wrong and what it is I am wrong about, in maybe a decade or so ;)
https://arxiv.org/pdf/1803.06824.pdf
https://arxiv.org/pdf/1306.0533.pdf
https://arxiv.org/pdf/1204.2779.pdf
I will almost certainly be wrong about whatever it is. However I may have more updates on how wrong and what it is I am wrong about, in maybe a decade or so ;)