Informal summary:
We used the Pantheon set of type Ia supernovae to look for any evidence of oscillations in the Universe's expansion history. Imagine that, as the universe was expanding, the energy density of dark energy or the strength of gravity or some other important cosmic property was oscillating. How might that show up, and do we see any evidence of it?
We developed a statistical test, based on Fourier analysis, to search for evidence of such oscillations. We found that there was no evidence of cosmic oscillations, and constrained a few simple oscillatory cosmic models.
Co-Authors:
Chris Stubbs, Dan Scolnic
Status:
The paper was published in 2016 in ApJ. The publication is titled: Constraining Temporal Oscillations of Cosmological Parameters Using SNe Ia.
Here is a link to the published article: https://iopscience.iop.org/article/10.3847/1538-4357/ab0c09
Documents:
Here are the final publication Figures (click on each Figure to see it):