Propagation of adiabatic and entropy perturbations in a bouncing universe
作者： Patrick Peter , Nelson Pinto-Neto , Diego A Gonzalez
DOI: 10.1088/1475-7516/2003/12/003
关键词: Physics 、 Adiabatic process 、 Cosmological perturbation theory 、 Entropy (arrow of time) 、 Energy condition 、 Cosmology 、 Gravitational potential 、 Almost surely 、 Classical mechanics 、 Energy density
摘要: 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 general relativistic bounce. We also find purely adiabatic modes, although almost always fruitfully investigated in all other contexts cosmology, are meaningless bounce or null energy condition (NEC) violation cases since entropy modes can never be neglected these situations: exhibit fake divergence is compensated total Bardeen gravitational potential inclusion perturbations.
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