Here are some references to Teleparallel Gravity:

http://www.phys.sinica.edu.tw/~heptheor ... ereira.pdf

The above should display 29 pages. Skim through these; there are flow charts that explain the concepts.

https://arxiv.org/pdf/gr-qc/0501017.pdf

The above link displays only 34 pages whereas it should display 48 pages. For the more advanced reader.

General Relativity has nonzero curvature and zero torsion. Teleparallel Gravity has zero curvature and nonzero torsion. Zero curvature in Riemannian geometry means flat space. In relativity that means Minkowski space. Torsion is the FORCE of gravity. It is not a result of a curved geometry (like in GR).

Recently, scientists derived an update to Special Relativity. It doesn't use Lorentz transformations. It uses Galilean Transformations. There is no Minkowski space and no length contraction. There are 3 dimensions of Euclidean space. There is no 4th dimension of space: it was represented by an imaginary coordinate, which is not physically measurable. Time is independent of space. There is time dilation and the invariant speed of light.

https://phys.org/news/2012-04-physicist ... space.html

Hayasaka stated that spinning gyroscopes fall more slowly than non-spinning ones. He dropped the gyros from an elevation, and measured their free-fall times with lasers. The right rotations slowed the descent the most. The left rotations slowed the descent less. The title of his 1997 report included the word "Antigravity." He said that it was due to Torsion. (His paper in 1994 had more details and he concluded the effect was, indeed, due to Torsion.)

Torsion is an angular momentum field effect that can be positive or negative. H. Morgan showed how torsion can travel from one spinning wheel to start another turning. E. Laithwaite said that spin radiation (torsion) reduced the weight of his spinning wheels (gyroscopes), when held vertically above his head. The Torsion of the earth and that of the gyroscopes interact; a FORCE is developed between them.

Everything is spinning: from elementary particles to faraway galaxies. My interpretation of Teleparallel Gravity is that Torsion is the force between spinning bodies in a 3d Euclidean space. Every spinning body has mass, included in its angular momentum (Torsion).