Dark matter and Wigner's third positive-energy representation class

The almost 7 decades lasting futile attempts to understand the possible physical content of the third Wigner representation class (the infinite spin class) came to a partial solution with the 2006 discovery of existence of string-localized spacetime covariantizations . This has led to a still ongoing vast generalization of renormalizability to fields with arbitrary high spin and a better understanding of the origin of partial invisibility as observed in the confinement of gluons and quarks. The present note explains the total (non-gravitational) invisibility of fields associated to the third Wigner representation class. The last section presents a critical look at the possibility that third class Wigner matter may play a role in dark matter formation.

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