Sublime

Every subatomic particle is not a solid and stable thing, but exists simply as a potential of any one of its future selves—or what is known by physicists as a “superposition,” or sum, of all probabilities, like a person staring at himself in a hall of mirrors.

combination of the Ricci tensor and curvature scalar.

not vary.

His eventual breakthrough was to realize that spacetime could be dynamic and curved, and the effects of that curvature are what you and I experience as “gravity.”

In particle physics and quantum field theory we have internal symmetries that “rotate” different parts of a quantum field into one another.