What is the spin-2 particle explanation for strong gravity?

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SUMMARY

The discussion centers on the concept of explaining the strong force through a spin-2 particle, distinct from the graviton. This theory posits that hadrons may behave as microscopic black holes, interacting through this spin-2 particle rather than gravitons. The framework involves two metrics and two Einstein-Hilbert terms with varying coupling constants. Although the idea did not gain traction, it holds historical significance, particularly in relation to low-scale quantum gravity models and potential black hole observations at the LHC.

PREREQUISITES
  • Understanding of quantum chromodynamics (QCD)
  • Familiarity with Einstein-Hilbert action in general relativity
  • Knowledge of particle physics, specifically spin-2 particles
  • Concepts of black hole physics and their interactions
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  • Research the implications of spin-2 particles in particle physics
  • Explore the historical context of theories predating QCD
  • Investigate low-scale quantum gravity models and their relevance
  • Study the potential for black hole detection at the Large Hadron Collider (LHC)
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Physicists, researchers in particle physics, and anyone interested in the theoretical underpinnings of strong gravity and its implications for quantum gravity models.

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I read some of one of the papers listed on the wikipedia page.

The basic idea seems to be that one might explain the strong force(this idea is from before QCD was established) as being a consequence of a spin-2 particle (which is not the gravition!) that has a coupling constant such that it becomes strong at the right energy scale. Didn't read much more but i think the idea is that hadrons might be microscopic black holes that interact not via gravitons but via this other spin-2 particle. So there would actually be two metrics, two Einstein-Hilbert terms for each metric in the action but with different coupling constants.

I'm pretty sure the idea didn't work out. But maybe it is of some historical interest especially if low scale QG models have something to do with nature and we see black holes at the LHC.
 

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