Comments on Unparticles

Understand

We comment on several points concerning unparticles which have been overlooked in the literature.

• One regards Mack's unitarity constraint lower bounds on CFT operator dimensions,e.g.
• d\geq 3 for primary, gauge invariant, vector unparticle operators.
• We correct the results in the literature to account for this, and also for a needed correction in the form of the propagator for vector and tensor unparticles.