Searching for a matter bounce cosmology with low redshift observations

Understand

The matter bounce scenario allows for a sizable parameter space where cosmological fluctuations originally exited the Hubble radius when the background energy density was small.

• In this scenario and its extended versions, the low energy degrees of freedom are likely responsible for the statistical properties of the cosmic microwave background power spectrum at large length scales.
• An interesting consequence is that these modes might be observable only at relatively late times.
• Therefore low redshift observations could provide evidence for, or even falsify, various bouncing models.