Sourced Scalar Fluctuations in Bouncing Cosmology

摘要: We calculate the scalar power spectrum generated by sourced fluctuations due to coupling between field, which holds most of energy density universe, and a gauge field for general FLRW metric. For this purpose we curvature perturbation second order in presence fields, show that fields behave like an additional potential term. then apply analysis case slow-contraction. Due interaction 'sourced' tensor spectra are generated. The resulting chiral, slightly blue arbitrarily close scale invariance. only difference is constant with ${\mathcal O}(1)$ numerical coefficient, some momentum space polarization vectors. As result tilt same. nearly invariant case, integration gives same leading contribution. Hence, $r\simeq 1$ where deviation from unity controlled invariance, not agreement CMB observations. Deviating considerably near considering bluer $n_T>0.12$, model cannot account observations, but can be detected LIGO and/or LISA future.