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Viscous cosmologies
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DOI：10.1088/1361-6382/ab45bb.png)
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摘要
En 中文
We probe into universes filled with quark gluon plasma with non-zero viscosities. In particular, we study the evolution of a universe with non-zero shear viscosity motivated by the theoretical result of a non-vanishing shear viscosity in the quark gluon plasma due to quantum-mechanical effects. We first review the consequences of a non-zero bulk viscosity and show explicitly the non-singular nature of the bulk-viscosity-universe by calculating the cosmological scale factor R(t) which goes to zero only asymptotically. The cosmological model with bulk viscosity is extended to include a cosmological constant. The previous results are contrasted with the cosmology with non-zero shear viscosity. We first clarify under which conditions shear viscosity terms are compatible with the Friedmann-Lamaitre-Robertson-Walker metric. To this end we use a version of the energy-momentum tensor from the Muller-Israel-Stewart theory which leads to causal Navier-Stoke equations. We then derive the corresponding Friedmann equations and show under which conditions the universe emerges to be non-singular.
Keyword:
cosmology with shear viscosity
shear energy-momentum tensor
initial singularity
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期刊
IF:
3.7
论文数:
1.3W
被引数:
3.0W
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