Matter is not constant. Matter and energy are both distortions of space time, and are interchangeable. They are continuously popping in and out of existence. Just look at hawking radiation, where a particle-antiparticle pair spontaneously springs into existence at the event horizon of a black hole and one falls in while the other escapes.
Matter is not constant. Matter and energy are both distortions of space time, and are interchangeable. They are continuously popping in and out of existence. Just look at hawking radiation, where a particle-antiparticle pair spontaneously springs into existence at the event horizon of a black hole and one falls in while the other escapes.
Energy is not conserved in our universe. This is simply an approximation that is used because it is true in most small scale scenarios.
Look up Noether’s theorem for the math