[mescaline]

Spin. Everything that has gravity eventually spins, so spin produces gravity and gravity produces spin. Even the moon spins, so I must be right.

Also, if you spin someone in a barrel, it produces a force that is indistinguishable from gravity, for the person in the barrel. Simple, but scientists like to make things complicated and confusing. Probably makes them sleep better at night.

See Newtons bucket argument. Spin is relational to the universe. If something spins, it produces gravity gradients. These come from differing frames of reference to time, or more specifically, variance in the pace of causality.

[bell-cot]

Alas, no. Inside the barrel (or any other spinning frame of reference) you get various pseudo-forces - https://en.wikipedia.org/wiki/Coriolis_force - with objects traveling in curved paths, and other weirdness. :)

[mescaline]

> with objects traveling in curved paths

Like curved spacetime inside a gravity well? :P

[panda-giddiness]

I mean, this is just factually incorrect – a pion is a spin-0 massive particle, e.g. (for that matter, a photon is a spin-1 massless particle).

[marginalia_nu]

If spin causes gravity, why doesn't a ferromagnet get lighter above the curie temperature?

[mescaline]

Above the Curie temperature for a given material, the spin orbits of the atoms are randomized. When it was a "magnet" the atoms spin orbits were lined up.

A spinning barrel has all the motion of the atoms "lined up" in a curve. The curve becomes a frame of reference to the remainder of the Universe. Whether or not the individual atoms of the barrel are lined up with each other, or not, is irrelevant to developing a gravitational gradient.

Magnets pull together field lines in the extant magnetic field. These field lines either don't exist or are straight lines, unless they happen to intersect with a gravity gradient or a piece of matter, which is itself a manifestation of vibrations in various fields. These vibrations are assumed to have various alignments, depending. When the Curie temperature is reached in a particular piece of matter, those vibrations become randomized in direction. So, the field lines passing through that matter would then remain "straightish". They aren't bent significantly in one direction or the other.

There is another possibility, which accompanies the idea of divergent magnetic field lines. Crystalline bismuth will causes fields lines to diverge along certain directions of the crystalline lattice. Above the equivalent idea of a Curie temperature for dielectrics, the material ceases to diverge the field lines and they regain their "straight" nature. If a plate of crystallized bismuth is placed in a magnetic field, it will tend to spin to align its lattice to the field lines with the least amount of divergence.

So, take a crystalized plate of bismuth. Create a strongly aligned and coupled magnetic field with two bifilar coils. Rotate the plate through the field, aligned perpendicularly to the field lines. Ensuring the planes of the lattice, as it rotates, impact the lines of force at an angle that maximizes the divergence of those field lines. Increase the rotation to the point that the field lines, in the frame of rotation are diverged significantly to form an effect. This would be assumed to have proportional effects based on the inertial mass of the rotating crystal. This would be visualized as a circle of bent field lines within a larger lattice of straight field lines, which grow larger as the rotational velocity is increased.

The resulting effect should manifest as an inertial field dampener for existing gravitational gradients. In other words, it should nullify the existing curvature of space in a particular area around the device, in a particular plane, maybe in the form of a circle.

If this were possible, it might have significant implications for developing a gravity shield. Or not.