# Thread: Combining gravity and quantum mechanics. What are gravitons then?

1. I understand gravity appears as an attraction between masses but this attraction is actually an artefact caused by geometry or topology, that is the warping of space time by mass, ie there is no exchange of force carrying particles.
Two people in free-fall gradually move towards each other as they each vector towards the centre of the earths mass, they could be forgiven for thinking there is an attractive force between them, but this 'attraction' is actually an artefact, there is no exchange of force carrying particles between them

Therefore, what is the role of gravtons?

When unifying gravity with quantum mechanics, can we say that some property of space-time is also being similarly affected by , lets say, particles and antiparticles and that this 'force' is actually another artefact? Is the concept of 'bosons' just a mathematical construct? It seems possible to measure their mass, so I guess not.....

String theory and supersymmetry would seem to suggest that fermions are also artefacts of a spacetime distortion ( in multiple dimensions), so it seems to me that a GUT should look to multidimensional geometry rather than a particle/energy/model.
Can anybody explain how 'charge' actually works?

Sorry for all the questions, but I'm just interested to learn.

2.

3. If anyone knew the answer, there would be a Unified Theory.
If space really is "nothing" then how can it have topology? If this is the case, it would require a force carrier to present the appearance of a topology.
If space really is "nothing" then how can it expand? How can light propagate through it?
If it is not "nothing" then it is something- what is it?

It's all unknown at this time.

4. Hm, well, space is certainly not 'nothing', it is 'space' ie. It has dimension and topology, and measurable vacuum energy. Electromagnetic waves propagate through it.

5. Originally Posted by Jeaunse23
Hm, well, space is certainly not 'nothing', it is 'space' ie. It has dimension and topology, and measurable vacuum energy. Electromagnetic waves propagate through it.
I agree that this is our observation so far. But it's still largely unknown. We do not know why it has certain properties or whether these properties exist outside of the known universe or not...

6. Well, no....

7. Graviton - Wikipedia, the free encyclopedia
In physics, the graviton is a hypothetical elementary particle that mediates the force of gravitation in the framework of quantum field theory. If it exists, the graviton is expected to be massless (because the gravitational force appears to have unlimited range) and must be a spin-2 boson.
Gravitation - Wikipedia, the free encyclopedia
The phenomenon of gravitation itself, however, is a byproduct of a more fundamental phenomenon described by general relativity, which suggests that spacetime is curved according to the energy and momentum of whatever matter and radiation are present.
The truth™ is that some particles think other particles are kinda cute. We just cannot see all that information from our perspective.
And they have no idea that when they make babies, it has remarkable effects in our world.

Who knows what they think of particle accelerators...

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