The relationship between curvature of matter and that of spacetime and the corresponding origin of gravity were solved and proven by Mills years ago.
https://brilliantlightpower.com/GUT/GUT-CP-2020-Ed-Web.pdf
The positive curvature of fundamental particles comprising ordinary-state matter gives rise to the Schwarzschild metric of spacetime without the singularity (See Chp 32) and gives rise to the well-known gravitational field, the masses of fundamental particles, and the cosmological parameters that match the observed evolution of the universe such as the observed acceleration of its expansion and the presence of greater that 14 billion year old stars and large-scale structure before they were observed. The free electron solved in Chp. 3 has flat geometry and has zero gravitational mass, confirmed experimentally (Chp. 35). Electrons form pseudospheres that have constant negative curvature in the presence of a gravitational field of magnitude that of a blackhole and have a corresponding negative gravitational mass. Relativistic electron jets from blackholes are a manifestation of this state as shown in Chp 35.
Years before its discovery, Mills exactly solved graphene as a layer of graphite as given in Chp. 16.
Quantum mechanical (QM) theory postulates that compounds comprise singularity electrons that are everywhere at once simultaneous with overlapping negative charge probability clouds that give rise to bonding. In a departure from the QM theory of matter, the Advanced Carbons Council is researching Mills view of matter and gravity with the mistakes that it is the electrons that must be negatively curved rather than the compound geometry, and a massive gravitation field is required to form negative gravitation mass.
For more information see prior posts:
https://brilliantlightpower.com/confirmation-of-decaying-dark-matter/
https://brilliantlightpower.com/gutcp-review-completed-webb-shows-predicted-big-bang-bust/
https://brilliantlightpower.com/dr-booker-theory-validation/
https://brilliantlightpower.com/free-electron-photon-absorption-mechanism/
https://brilliantlightpower.com/reactionless-propulsion/
https://brilliantlightpower.com/addendum-to-reactionless-propulsion-post/