hypothetically if you could create portals, could you essentially use that to destroy matter? A cube of portals each facing inward (each portal leads directly to another portal on the opposite side of an object) that collapses in on itself. You are constantly reducing the space an object takes up until, it takes an infinitesimally small space. I don't know the physics of it, but you could reduce an object to a space smaller than the dimensions of atoms or quarks.