Dark Matter as higher-dimensional gravity

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SUMMARY

This discussion centers on the compatibility of dark matter with higher-dimensional gravity as predicted by string theory. Participants highlight the fundamental discrepancy between the short-range effects of extra dimensions, as suggested by Arkani-Hamed, and the long-range gravitational effects of dark matter observed at celestial scales. The conversation emphasizes that while string theory proposes tiny, curled-up dimensions, the gravitational influence of dark matter operates over vast distances, making the two concepts seemingly incompatible. The thread ultimately concludes with a reminder of the forum's rules against personal theories and speculation.

PREREQUISITES
  • Understanding of string theory and its predictions regarding extra dimensions
  • Familiarity with dark matter and its gravitational effects
  • Knowledge of Modified Newtonian Dynamics (MOND) and its implications
  • Basic principles of gravitational physics
NEXT STEPS
  • Research the implications of Arkani-Hamed's predictions on sub-millimeter scale physics
  • Explore the principles of Modified Newtonian Dynamics (MOND) and its relevance to dark matter
  • Study the mathematical framework of string theory and its proposed extra dimensions
  • Investigate current experimental efforts to detect higher-dimensional effects in gravitational physics
USEFUL FOR

Astronomers, theoretical physicists, and students of cosmology interested in the intersection of dark matter and higher-dimensional theories.

Chemist@
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Are there any hypotheses on dark matter being gravity force in the higher dimensions predicted by string theory? I would like to read such hypotheses.
 
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Chemist@ said:
Are there any hypotheses on dark matter being gravity force in the higher dimensions predicted by string theory? I would like to read such hypotheses.

But right off the bat, don't you see a glaring problem with marrying those two?

The extra dimensions that have been talked about are tiny, curled up dimensions that might only exhibit non-Newtonian deviation at very small distances (Arkani-Hamed predicted sub millimeter scale at most, but even that hasn't been seen up to micron scale).

On the other hand, the gravitational effects of dark matter is long-range! Even MOND predicts that its effects kick in at celestial scale to match observations.

So why would you think these two extremes are compatible with one another in the first place?

Zz.
 
Several posts have been removed after this thread drifted into personal theories and speculation prohibited by the Physics Forums rules.

This thread is closed.
 

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