Is it actually necessary to quantize gravity? Couldn’t it be an emergent property?

Mudassir Ali
Feb 15, 2020 05:24 AM 0 Answers
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Mudassir Ali
- Feb 15, 2020 05:24 AM

No, it is not “necessary”. Gravity is a feature of nature, and nature cares not what we do with our theories. If nature has decided not to quantise it, then gravity will continue to work irrespective of what we do. There is a tendency for theoretical physicists to try to use the maths that work well for something on something else. That is fair enough because we want to understand, but it must be appreciated that mathematics does not determine anything; it is a tool that describes what we see, and if we do not see any quantum effects, then it is a waste of time trying to force nature into our preconceived wants. One point of theory, of course, is to try and predict something we did not see, so as to take us into new territory, but there is a problem with gravity and that is it seems to do one thing and one thing only. That makes it very difficult to work out what it is. My personal feeling is it is emergent, but not from something like spacetime, simply because it does do only one thing, but again, that is a personal feeling, which arguably has no real meaning. However, whether it is or is not quantised, you have to ask what is quantised. In quantum mechanics, it is action, and we can predicted the effects from it. It is yet to be shown that anything requires quantisation with respect to gravity. Just because we feel it might be neat if it were does nto amke it so; nature is uninterested in what we feel.

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