I raise the question for discussion. I hope.
Looking into the universe as it is, I understand that the matter is as it is, because the electromagnetic field (even nuclear forces tend to be electromagnetic in high temperatures) and the gravitational field are as they are.
On the other hand, these fields are as they are because the matter is as it is.
Electromagnetic fields results from the electric nature of the matter constituting blocks. They carry electric charge. Gravitational fields are closed associated with mass. Electromagnetic forces are formally described by the values of charges in presence. Gravitational forces are formally described by the values of the masses in presence.
So, there is a property of the matter (electric charge) that we link to electromagnetic fields.
Hence, what is the corresponding property of the matter, that we should associate with gravitational field?
the fact that there are two types of charge, is excellent- It allows for information flow. There would be no life, if this was not possible.
but we need energy storage. Is the mass, responsible for that? is this energy storage mechanism that demands that gravitational forces are always attractive?