Etymology

phantom energy

Today it means: The energy that is lost due to standby electronic activity of equipment that is "off", on standby or sleep mode. Full definition →

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phantom energy · noun1

From phantom + energy.

phantom energy · noun2

Coined by physicist Robert R. Caldwell in 1998, in reference to the Star Wars movie The Phantom Menace, in his paper "A Phantom Menace? Cosmological consequences of a dark energy component with super-negative equation of state" referring to the "phantom energy menace" that would lead to the Big Rip.

Etymology from Wiktionary, CC BY-SA 4.0.