Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun physics Used attributively to describe the state of a
positronium exotic atom in which thepositron andelectron haveparallel spins
Etymologies
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Examples
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The existence of the mirror world can contribute to invisible decay of orthopositronium via orthopositronium-mirror orthopositronium oscillations, see here, but Randall-Sundrum type extra dimensions can also lead to the same effect.
Identifying Dark Matter Mark 2006
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It was realized some time ago by Glashow [5] that the orthopositronium system provides one sensitive way to search for the mirror universe.
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The idea is that small kinetic mixing of the ordinary and mirror photons may exist which would mix ordinary and mirror ortho positronium, leading to maximal ortho positronium - mirror orthopositronium oscillations.
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