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Douglas_Knight comments on Crazy Ideas Thread - Less Wrong Discussion
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No, it is not believed that gravity has a measurable effect on chemistry. People have pretty much no idea what kind of experiments would be relevant to quantum gravity. Moreover, the predictions that QFT makes about chemistry are too hard. I don't think it is possible with current computers to compute the spectrum of helium, let alone lithium. A quantum computer could do this, though.
I'm by no means a physicist, but isn't special relativity, which is related to gravity/spacetime, able to cause magnetism? Couldn't that account for a chemical effect?
Yes, special relativity is very important. Indeed, I was speaking of QED, a quantum mechanical model that incorporates special relativity.