TL;DR
This paper discusses quantum revivals in free field conformal field theories, extending previous results to fermion fields and analyzing the mathematical structure behind revival phenomena.
Contribution
It extends the analysis of quantum revivals in CFTs to fermion fields and clarifies the mathematical basis of revival phenomena in odd spheres.
Findings
Quantum revivals are explained for fermion fields.
The power spectrum involves the odd divisor function.
Rational revivals are linked to field quantization issues.
Abstract
A commentary is made on the recent work by Cardy, ArXiv:1603. 08267, on quantum revivals and higher dimensional CFT. The actual expressions used here are those derived some time ago. The calculation is extended to fermion fields for which the power spectrum involves the odd divisor function. Comments are made on the equivalence of operator counting and eigenvalue methods, which is quickly verified. An explanation of the rational revivals for odd spheres is given in terms of wrongly quantised fields.
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