Honestly theres still so much no one knows about gravity but I have come up with a possible deduction that gravity doesnt depend on much else other than mass ... as you can see humanity has a higher density them water so we cant walk on water so then our mass pulls us down through the water and have you noticed anything with a higher density will flow through water and depending on the mass is how fast it sinks or if it floats so if you could generate enough mass or mass effect im sure it will cause a gravitational field to appear thus giving you phasing or warping capabilities if you harnessed that mass effect field and your graviton weight