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“If Dirac’s idea restores the stability of the spectrum by introducing a stable vacuum where all negative energy states are occupied, the so-called , it also leads directly to the conclusion that a single-particle interpretation of the Dirac equation is not possible.”
“Now his principal doctrines were these. That atoms and the vacuum were the beginning of the universe; and that everything else existed only in opinion.”
“It's illegal to make superpositions with different vacua. That's one of the rules of quantum field theory.”
“Natura abhorret vacuum. (Nature abhors a vacuum.)”
“The physicist's concept of nothing—the vacuum... began as empty space—the void... turned into a stagnant ether through which all the motions of the Universe swam, vanished in Einstein's hands, then re-emerged in the twentieth-century quantum picture of how Nature works.”
“Einstein showed us that the Universe might contain a mysterious form of vacuum energy. ...Last year, two teams of astronomers used Earth's most powerful telescopes... to gather persuasive evidence for the reality of the cosmic . Its effects are dramatic. It is accelerating the expansion of the Universe.”
Quotes via Wikiquote (CC BY-SA), each with its original source.