Unseen Slide: Dark Matter as a Hidden Dimension?

Richard Townsend said:
Could the extra pull we blame on dark matter actually come from gravity acting weirdly in curled-up space?
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I'm aware that gravity acting weirdly (not in accordance with Newton's inverse square law) is the basis of the MOND hypotheses for Dark Matter: https://en.wikipedia.org/wiki/Modified_Newtonian_dynamics

But there's nothing there about curled up extra dimensions, so far as I know. That idea seems to belong to string "theory", which is a cottage industry in cosmological physics that seems to have been going nowhere for the last couple of decades.
 
exchemist said:
I'm aware that gravity acting weirdly (not in accordance with Newton's inverse square law) is the basis of the MOND hypotheses for Dark Matter: https://en.wikipedia.org/wiki/Modified_Newtonian_dynamics

But there's nothing there about curled up extra dimensions, so far as I know. That idea seems to belong to string "theory", which is a cottage industry in cosmological physics that seems to have been going nowhere for the last couple of decades.
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MOND just changes the force law at low accelerations. Extra dimensions come from a totally different line of work, mostly in higher‑dimensional gravity and string‑inspired models. They aren’t really connected, and extra dimensions aren’t part of MOND.
 
Richard Townsend said:
MOND just changes the force law at low accelerations. Extra dimensions come from a totally different line of work, mostly in higher‑dimensional gravity and string‑inspired models. They aren’t really connected, and extra dimensions aren’t part of MOND.
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That's what I said: nothing about extra dimensions in MOND.

How could we be "sliding through" a curled up extra dimension, as you put it? If it's curled up, it does not affect behaviour at macro scale. When string models invoke such curled up dimensions that is precisely to avoid the problems they would otherwise create for macro scale behaviour, which is observed to require only 4 dimensions to account for it.

Read this for instance: https://web.physics.ucsb.edu/~strings/superstrings/extradim.htm
 
Richard Townsend said:
If dark matter isn't made of particles, could it instead be a hidden dimension we're all sliding through without noticing?
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If it was a hidden dimension, it wouldn't be matter.
Richard Townsend said:
Could the extra pull we blame on dark matter actually come from gravity acting weirdly in curled-up space?
Click to expand...
I don't know. What do you think? What has your research on this question uncovered so far?
 
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