Evidences for bouncing evolution before inflation in cosmological surveys

Understand

Inflationary cosmology with a preceding nonsingular bounce can lead to changes on the primordial density fluctuations.

• One significant prediction is that the amplitude of the power spectrum may undergo a jump at a critical scale.
• In this Letter we propose a phenomenological parametrization of the primordial power spectrum in this scenario and confront the jump feature with latest cosmological data.
• Performing a global fitting, we utilize this possibility to derive a novel method for constraining bounce parameters via cosmological measurements.