A note on Infraparticles and Unparticles - High Energy Physics - TheoryReport as inadecuate

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Abstract: The observed astrophysical phenomenon of dark matter has generated newinterest in the problem of whether the principles underlying QFT are consistentwith invisibility-inertness of energy-momentum carrying -stuff- as e.g.-unparticles-. We show that the 2-dim. model which has been used to illustratethe meaning of unparticles belongs to the class of former infraparticles modelsand the latter are known to describe electrically charged particles in d=1+3which despite their nonlocality are our best particle physics -candles-. The-invisibility- in this case refers to the infinite infrared photon cloud withenergies below the resolution and can be made arbitrarily small by increasingthe photon registering sensitivity. This is not quite the kind of invisibilitywhich the unparticle community attributes to their invisible -stuff- and whichwould probably contradict the asymptotic completeness property. The main aim ofthe present work is to show that knowledge about this part of QFT is still inits infancy and express the hope that the work on unparticles may rekindle anew interest in conceptually subtle old unsolved important problems.

Author: Bert Schroer

Source: https://arxiv.org/

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