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Curious if this is a valid conceptual synopsis of string theory and/or quantum gravity's overlap with Einstein's general relativity. Without doing complex math I'd like to see if I have summarized correctly why string theory posits nine dimensions plus time, and to use a thought experiment to try and shed light on how elementary particle spin direction has a potentially existential influence on its relationship to gravity from our 3-D spacetime.

"Thought experiment approaches have been suggested as a testing tool for quantum gravity theories. In the field of quantum gravity there are several open questions – e.g., it is not known how the spin of elementary particles sources gravity, and thought experiments could provide a pathway to explore possible resolutions to these questions, even in the absence of lab experiments or physical observations."

Here is a quick thought experiment that may shine light on why direction of vibration or spin can have a profound affect on a particle's interaction with our world's gravity, or lack thereof, hopefully lending some intuitive explanatory power that a layperson or elementary student could understand.

Consider for further context the foundation laid by Einstein's theory of general relativity, and how it describes spacetime "curving" in response to gravity, which made intuitive sense as one hypothetical falling observer (ie in orbit) reports falling in a straight line; yet we report they appear to be in an elliptical orbit. Space time has curved due to earth's gravity, and both observers are correct.

Yet for "spacetime" to curve, it needs negative space. As with a linear rod curving elliptically to embody 3 dimensions, curvature thus inherently acting as a multiplier of 3 on dimension becomes clearer. We need to multiply by 3 to allow for curvature, so we need 3 x 3 = 9 dimensions for any curvature of our 3D spacetime-world due to gravity.

When gravity curves our spacetime, that fabric needs negative space to curve into or out of, yet we note no measurable physical effects incoming from that "negative space."

This requires 9 dimensions in our physical reality, overlaid, all acting as the superfabric of our universe.

Yet generally-imperceptible to us and vice versa, these other spaces are overlaid with our shared cosmos, together sharing gravitational storage information in the curvatures of 9 dimensional superspace, and per observation, these other spaces are not discernably affected by gravity from our spacetime, nor vice versa.

So clearly direction of vibration has an existential effect on possible relevance to our world's gravitation. Our worlds only interact by storing quantum-gravitational information for each other, which is imperceptible to general 3-D physics. For gravity curvature in world 2, there will be curvatures of all 3 spacetimes, yet not in the direction of their own spacetime for two of those three. Our spacetime is thus bending and curving to accomodate for fluctuations and physical movements in worlds 2 and 3 (with say ours being world 1), yet where 3-D matter in our world will not be gravitationally affected by these movements in world 2 or 3, because our world 1 is bending only in the dimensions of world 2 and/or 3, whose gravity has no influence on us. A physicist in spacetime 2 or 3 has every right to ask why the spin of *our* elementary particles makes us imperceptible to them, yet while our worlds remain in a state of gravitational superposition.

Thus in this way the three spacetimes are able to help each other bend and curve in 9-D real time to accomodate for physics and gravity (perhaps storing quantum gravitational information for each other) without basic physics co-influencing across 3-D spacetimes.

Food for thought also includes the existence of black holes- is there a gravity that can exist in a spacetime that is strong enough that it can eventully begin to break the barrier and start to send influence across dimensional boundaries? Like if a black hole in world 2 were to grow big/strong enough, could it eventually cause a gravitational anomaly in world 1 or 3? Could dark matter / energy be a relevant piece of this puzzle?

Or can particles utilize dimensions a la carte, and borrow one or two dimensions from our world? Why do particles seem to only have the capacity to utilize zero or three of our world's dimensions?

Is it a valid take to assert that Einstein's relativity actually implies a 9-dimensional superspace (plus time) physical reality (also predicted by string theory) in asserting that our 3-D spacetime can "bend" or curve; and that there may/must be matter within these other two spacetimes which simply does not perceive our gravity (nor vice versa) because it has an inherently incompatible direction of vibration, momentum, and/or spin? Carl.r.larson (talk) 18:57, 29 December 2025 (UTC)[reply]