Adiabatic and entropy perturbations propagation in a bouncing Universe

@article{Peter2003AdiabaticAE,
  title={Adiabatic and entropy perturbations propagation in a bouncing Universe},
  author={Patrick Peter and N. Pinto-Neto and Diego Gonzalez},
  journal={arXiv: High Energy Physics - Theory},
  year={2003}
}
By studying some bouncing universe models dominated by a specific class of hydrodynamical fluids, we show that the primordial cosmological perturbations may propagate smoothly through a general relativistic bounce. We also find that the purely adiabatic modes, although almost always fruitfully investigated in all other contexts in cosmology, are meaningless in the bounce or null energy condition (NEC) violation cases since the entropy modes can never be neglected in these situations: the… 
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