(a) Closed amounts (volumes with mass), such as normal particles. Their inside spacetime "pushes" the surrounding spacetime to generate room. Thus, "closed volumes" generate a new convex curvature of spacetime. Since your second item has properties connected with elasticity (Einstein), the item exerts a strain to the surface of these volumes. As your result, some sort of "mass effect" appears, i.e. a great outcome owning all of the qualities associated with mass. The mass component is usually extracted with the stress by means of simple numerical experditions (see your mathematical showing section). This conducts into a 4D period in the mass: m = f(x,y,z,t).
(b) Open Volumes (massless volumes): It is probably your vacuum, but occasionally observed in various types for example size regarding orbitals or the room among atoms. These quantities appear to be nonetheless they are usually "porous" with regards to spacetime. More exactly, they may be foreclosures versions connected with spacetime however apart from curve spacetime themselves. Therefore, open volumes are usually massless considering that simply no curvature suggests absolutely no mass (Einstein).
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