Bouncing Cosmology is an alternative mechanism to inflation for generating the observed isotropy of the Universe as well as the seeds for large structure formation.

In a bouncing cosmology scenario the universe first contracts very slowly then 'bounces' and expands according to the standard Hot Big Bang scenario.

During the slow contraction phase the universe isotropizes and small fluctuations generate the seeds for structure formation. 

A generic prediction of bouncing cosmologies is the absence of detectable primordial gravitational waves, contrary to inflation.

We show how this prediction is modified if one considers the presence of gauge fields during the slow contraction phase.