Spacetime: The cause of matter?

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SUMMARY

In the discussion regarding Jonathan Schaffer's paper "Spacetime the one substance," philosopher Philip Goff posits that matter is a result of curvature in spacetime, a concept known as super-substantivalism. This challenges the traditional view that mass causes spacetime curvature. Participants debated the acceptance of particles as manifestations of fields and the implications of considering mass as a manifestation of spacetime curvature. However, it was concluded that the paper lacks a physics model capable of making testable predictions, rendering it unsuitable for further discussion in a physics context.

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Buckethead
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TL;DR
Thoughts on the idea that the curvature of spacetime causes matter and not the other way around
In a paper written by Jonathan Schaffer entitled Spacetime the one substance (https://philpapers.org/rec/SCHSTO-7) which I have not read but which I found as a reference in a book by philosopher Philip Goff, Goff suggests that matter is actually created by a curvature in spacetime rather than the curvature of spacetime being caused by mass. An idea he refers to as super-substantivalism.

This idea is fascinating to me since I have seen videos or books (sorry no references) suggesting that particles an just manifestations of fields. So my questions are:
Is it generally accepted that particles are indeed just manifestations of fields and if so:
Does it make sense to leave out that middleman and just go one level deeper and accept that mass is just a manifestation of curvature of spacetime? It's an appealing idea and I was wondering what thoughts folks have on this idea?
 
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In Einstein equation LHS express a spacetime feature and RHS express energy-momentum. One is always accompanied by the other but it may not be appropriate to say one comes first then the other follows.
 
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Buckethead said:
Goff suggests that matter is actually created by a curvature in spacetime rather than the curvature of spacetime being caused by mass.
The paper you reference is philosophy, not physics. A physics model of this suggestion would have to actually do math to construct a model that actually made testable predictions. The paper does not do that. As such, it is off topic for discussion in this forum.

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