Quantum particle hypothesized or theorized or part of a posited model or explanation.
1
He was professor of theoretical particle English at St. Broccoli's in Oxford, so knew how to merge physics and literature.
2
The theoretical particle explains how suns and planets formed after the Big Bang - but so far it has not been proven to exist.
3
But when Jackson arrives in the large interrogation room, his pupils are the size of purely theoretical particles.