Bouncing Cosmologies with Dark Matter and Dark Energy
Yi-Fu Cai,
Antonino Marcianò,
Dong-Gang Wang,
Edward Wilson-Ewing
Affiliations
Yi-Fu Cai
CAS Key Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Chinese Academy of Sciences, 230026 Hefei, China
Antonino Marcianò
Department of Physics & Center for Field Theory and Particle Physics, Fudan University, 200433 Shanghai, China
Dong-Gang Wang
CAS Key Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Chinese Academy of Sciences, 230026 Hefei, China
Edward Wilson-Ewing
Max Planck Institute for Gravitational Physics (Albert Einstein Institute), Am Mühlenberg 1, 14476 Golm, Germany
We review matter bounce scenarios where the matter content is dark matter and dark energy. These cosmologies predict a nearly scale-invariant power spectrum with a slightly red tilt for scalar perturbations and a small tensor-to-scalar ratio. Importantly, these models predict a positive running of the scalar index, contrary to the predictions of the simplest inflationary and ekpyrotic models, and hence, could potentially be falsified by future observations. We also review how bouncing cosmological space-times can arise in theories where either the Einstein equations are modified or where matter fields that violate the null energy condition are included.
