Windowing Artifacts Likely Account for Recent Claimed Detection of
  Oscillating Cosmic Scale Factor
  Using the Pantheon data set of Type Ia supernovae, a recent publication (R20
in this work) reports a $~2\sigma$ detection of oscillations in the expansion
history of the universe. Applying the R20 methodology to simulated Pantheon
data, we determine that these oscillations likely arise from analysis
artifacts. The uneven spacing of Type Ia supernovae in redshift space and the
complicated analysis method of R20 impose a structured throughput function.
When analyzed with the R20 prescription, about $11\%$ of artificial
$\Lambda$CDM data sets produce a stronger oscillatory signal than the actual
Pantheon data. The study conducted by R20 is a wholly worthwhile endeavor.
However, we believe that the detected oscillations are not due to an
oscillating cosmic scale factor and are instead artifacts of the data
processing. Our results underscore the importance of understanding the false
`signals' that can be introduced by complicated data analyses.
