# Thread: What is Gravity, when will we learn enough to be able to manipulate it

1. As I read another post about gravity a question that has been on my mind for years popped back into my head: exactly what is gravity? Will we ever be able to nullify it, manipulate it (great for a type of propulsion), amplify it (possibly to create a wormhole for instance).

2.

3. We don't know exactly what gravity is, but we have a geometric model for it that works well and is based on the concept that space and time are intrinsically linked as space-time, and that the presence of mass and energy causes space-time curvature.

4. Originally Posted by SpeedFreek
We don't know exactly what gravity is, but we have a geometric model for it that works well and is based on the concept that space and time are intrinsically linked as space-time, and that the presence of mass and energy causes space-time curvature.
That is according to the Theory of Relativity I believe, no?

I lean more toward the theory which has postulated that we exist within either 13 or 28 dimensions (28 if we can prove super-symmetry).

That may mean that we will never detect the "graviton" until we more fully understand the nature of these dimensions. This has consumed many hours for me, wondering if all of these dimensions underwent the same phase of inflation that the currently observed 4 space-time dimensions did shortly after the big bang. Perhaps one or more dimensions only inflated a little bit or not at all. Given that possibility it would form the basis of a method of hyperspace travel.

5. Originally Posted by WorldCitizenUSA
Originally Posted by SpeedFreek
We don't know exactly what gravity is, but we have a geometric model for it that works well and is based on the concept that space and time are intrinsically linked as space-time, and that the presence of mass and energy causes space-time curvature.
That is according to the Theory of Relativity I believe, no?

I lean more toward the theory which has postulated that we exist within either 13 or 28 dimensions (28 if we can prove super-symmetry).
Does the theory you lean toward actually make any predictions about how the gravity of one object affects another object, with the same accuracy as General Relativity (which is very accurate in this regard)?

6. Why does gravity travel at the speed of light anyway? (does it?)

7. What is Supersymmetry? - YouTube

I stand corrected. Supersymmetry is not a theory it is a principle which makes up a component of a theory. But it does offer one enticing detail:
From a purely theoretical standpoint, supersymmetry also helps resolve physics at the very small scale of particles (quantum physics) and physics at the very large scale (general relativity) by offering ways to fuse the two into a Grand Unified Theory (GUT), whereby, at extremely high energies (above 1016 GeV), the electromagnetic, weak nuclear, and strong nuclear forces are fused into a single unified field.
Source: LHC Results Do Battle with Supersymmetry : Discovery News

8. Originally Posted by icewendigo
Why does gravity travel at the speed of light anyway? (does it?)
Gravity Probe B - Special & General Relativity Questions and Answers

Gravity appears to travel at the speed of light as I understand it.

But the relevant question is, why is gravity so weak compared to all the other forces. Multiple spacial dimensions may provide the answer to that question if gravity travels in and out of our 3-dimensional pocket of the universe and mostly resides in the larger universe, perhaps on a separate brane or only on the surface of the brane that "we" are close to yet not in contact with. So gravity would exhibit all the characteristics we know here yet be far stronger in other regions/dimensions/branes. Supersymmetry and Parallel Dimensions | News | The Harvard Crimson

9. How i wish we knew why its So weak compared to others,we would have increase our understanding of the universe. But as it stands it doesn't,but the reason why it appears to travel at speed of light is because the predicted graviton is expected to be ℓιкє a photon.