This paper develops carefully an original theory of dark matter, whose main hypothesis is that DM is generated by the own gravitational field. This work introduces the best version of the theory physical and mathematically, which has been developed and published since 2013.The hypothesis of DM by gravitation has two main consequences: the first one is that the law of DM generation has to be the same, in the halo region, for all the galaxies and the second one is that the haloes are unlimited so the total DM goes up without limit. Both properties are crucial for the success of this theory. The newness of this work regarding the previous paper, [13] Abarca,M. 2023, is the chapter 12, where it is studied the DM by gravitation theory at the disk and halo regions. The numerical method used in this chapter is a bit rough but using the rotation curve at disk and its baryonic mass profile has been possible to estimate roughly DM density at disk depending on the field. Three main conclusions have been got in this chapter.1º at the disk region, there is a clear functional dependence between DM density versus field E according a potential function DDM = Au2022E^B, although the exponent of the power is not 5/3 because the baryonic mass density is not zero in this region.2º at the halo region, the parameters A & B got with a quite rude method are similar to the ones got in chapter 11 with the analytical method. This similarity shows that this rude method may be accepted in order to study the function DM density versus a power of field as a first approximation to this law.3º Even with a method so rough it is possible to estimate the Solar DM density. The result got with that method differs only 15% regarding the current value accepted by the scientific community.To study the DM theory more in depth at the disk region it is needed to solve the Poisson equation using together the baryonic density and the DM density, but unfortunately it is required sophisticated software, however at the halo region the Poisson equation is easy to solve, as it was shown in [13] Abarca,M. 2023, chp.15. Fortunately it is the galactic halo the most important region of galaxies to study DM in Cosmology.