We may still insist that space, although mainly emptiness, is completely “contaminated” by all the forces in the Universe—particles, waves, and so on. Still, based on this deduction or inference, we cannot prove that what is curved is space since nothing remains nothing and cannot be transformed into something based on the laws of physics. If the Nothing does not convert into something, the curvature of space is impossible. To prove the curvature of nothing (space), we must prove that nothing can transform itself into something based on the laws of physics.
“We may still insist that space, although mainly emptiness, is completely “contaminated” by all the forces in the Universe—particles, waves, and so on. Still, based on this deduction or inference, we cannot prove that what is curved is space since nothing remains nothing and cannot be transformed into something based on the laws of physics. If the Nothing does not convert into something, the curvature of space is impossible. To prove the curvature of nothing (space), we must prove that nothing can transform itself into something based on the laws of physics.”
— Dejan Stojanovic · Time