The Absence of Periodicity in Repeating FRB

Understand

Popular Fast Radio Burst models involve rotating magnetized neutron stars, yet no rotational periodicities have been found.

• Small datasets exclude exact periodicity in FRB 121102.
• Recent observations of over 1500 bursts from each of FRB 121102 and FRB 20201124A also have not found periodicity.
• Periodograms of events with cosine-distributed random offsets as large as $\pm 0.6 P$ from a strict period $P$ would still reveal the underlying periodicity.