Negative energy is a concept used in , , and speculative fiction for a contrast with regular or positive energy. The equation relating energy, mass and momentum in special relativity is: E = p c + m c , a quadratic equation which also has a negative solution used to predict the existence of antimatter by Carl Anderson for the positron or later any antiparticle moving in the opposite direction of a Feynman diagram. Negative energy may be used in: Physics * Particle physics ** Exotic matter ** Antiparticle ** ** Tachyon ** Demon algorithm * Theoretical models of the vacuum, space, and space-time ** Dirac sea ** Dirac equation in the algebra of physical space ** Anti de Sitter space ** Kodama state ** Wormhole ** Hawking radiation ** Ergosphere ** Time travel ** Retrocausality ** Faster-than-light ** T-symmetry Fiction * A theme, aspect, plot device, or characterization ** Negative Energy Plane, an aspect of the Dungeons & Dragons game ** ** Negative Woman ** Negative Man ** Janus the Nega-Man ** ** Muir Island Saga ** ** Bakugan Battle Brawlers ** Manhattan Baby ** ** ** ** ** ** ** Omega Wave ** ** Sailor Moon ** Esotericism * Beliefs and rituals ** ** ** Unsibanbon ** Shinnyo-en ** Benedicaria ** Shamanism ** Shamanic music ** Shingon Buddhism * Buildings and structures ** Feng shui ** Zig-zag bridge ** Tiang Seri ** Bosnian pyramids * Objects and materials ** Gohei ** Witch bottle ** Prayer beads ** Besom broom ** Smudge stick ** ** Bach flower remedies ** Red bean soup ** Salvia apiana ** Religious use of incense * Skepticism and pseudoscience ** Melanin theory ** Extrasensory perception