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

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In summary, the conversation discusses the concept of strong gravity and its potential explanation through a spin-2 particle with a strong coupling constant. This idea has been proposed before the establishment of Quantum Chromodynamics (QCD) and suggests that hadrons may be microscopic black holes interacting through this spin-2 particle instead of gravitons. It is mentioned that the idea did not work out, but may still be of historical interest, particularly in relation to low scale Quantum Gravity (QG) models and the potential observation of black holes at the Large Hadron Collider (LHC).
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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.
 

1. What is strong gravity?

Strong gravity refers to the force of attraction between two objects with mass. It is one of the four fundamental forces of nature, along with weak nuclear force, electromagnetism, and gravity.

2. How does strong gravity differ from other types of gravity?

Strong gravity is significantly stronger than other types of gravity, such as the force of gravity between two objects on Earth. It is also responsible for holding particles together in the nucleus of an atom.

3. What is the relationship between strong gravity and black holes?

Strong gravity plays a crucial role in the formation and behavior of black holes. When a massive star dies, its core collapses under the force of strong gravity, creating a singularity and surrounding event horizon that defines a black hole.

4. Can strong gravity be observed or measured?

Yes, strong gravity can be observed and measured through various methods, including studying the motion of objects around massive bodies, observing the effects of gravitational lensing, and using gravitational wave detectors.

5. Is strong gravity the same as the theory of general relativity?

No, strong gravity and the theory of general relativity are not the same. General relativity is a theory that explains gravity as the curvature of spacetime, while strong gravity is a force that acts between objects with mass.

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