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gr-qc2013★ 41 cited
Universe Models with Negative Bulk Viscosity
Iver Brevik, Øyvind Grøn
The concept of negative temperatures has occasionally been used in connection with quantum systems. A recent example of this sort is reported in the paper of S. Braun et al. [Scien…
astro-ph.CO2013★ 16 cited
Bianchi Type-I Universe Models with Nonlinear Viscosity
Nouraddin Mostafapoor, Oyvind Gron
In this paper we study the evolution of spatially homogeneous and anisotropic Bianchi type-I Universe models with the cosmological constant, Λ, and filled with nonlinear viscous fl…