Q: Why does energy have to be positive (and real)?

Q: Why does energy have to be positive (and real)?

I’m confused by the fact that in the article they discuss imaginary mass, but don’t even consider imaginary energy. However, we’ve made observations that imply that energy can be a little negative for a very short time (negative energy virtual particles), but actual negative energy has never been directly observed. So the physical law that forces energy to be real is: “energy is always real”. Negative matter, often called “exotic matter” and not to be confused with anti-matter, does exactly the opposite of what ordinary matter does. There are plenty of people excited about negative energy (so explore around), but don’t expect any of it to pan out.

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