Antienergy

Antienergy is a neologism used in some speculative or fictional contexts to refer to a hypothetical counterpart to conventional energy, such as energy that flows in opposition to matter, or a quantity associated with antiparticles or time-reversed processes. It is not a standard term in established physics, and there is no widely accepted definition or formal framework.

The concept sometimes appears in discussions of exotic phenomena or speculative theories where energy and other conserved quantities might have paired opposites. In mainstream physics, negative energy densities are known to arise in certain quantum field theory setups, such as the Casimir effect or in hypothetical constructs like traversable wormholes, but these negative energies are highly constrained and do not amount to a general antiparticle-facing quantity called antienergy. Likewise, energy of antiparticles is described by the same energy spectrum as particles in relativistic quantum mechanics; there is no separate antienergy observable.

In science fiction and popular science, antienergy may be invoked as a potential power source, a means of propulsion, or a resource that can be converted to ordinary energy under specific interactions; such usages are symbolic rather than empirical.

Overall, antienergy remains a fringe or fictional concept rather than a recognized physical quantity. Its precise meaning varies by author, and it is typically treated as speculative.