Viscous Bianchi Type I Universe with Stiff Matter and Decaying Vacuum Energy Density

<table>Variation of expansion anisotropy <svg height="10.9125" id="M163" style="vertical-align:-0.17555pt" version="1.1" viewbox="0 0 21.8375 10.9125" width="21.8375" xmlns="http://www.w3.org/2000/svg">
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<tspan style="font-size: 12.50px; " x="0" y="0">𝜎</tspan>
<tspan style="font-size: 12.50px; " x="7.3267579" y="0">/</tspan>
<tspan style="font-size: 12.50px; " x="10.802592" y="0">𝜃</tspan>
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</svg> with cosmic time <svg height="9.125" id="M164" style="vertical-align:-0.11285pt" version="1.1" viewbox="0 0 5.0124998 9.125" width="5.0124998" xmlns="http://www.w3.org/2000/svg">
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<tspan style="font-size: 12.50px; " x="0" y="0">𝑡</tspan>
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International Scholarly Research Notices

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Figure 4

Figure 4: Viscous Bianchi Type I Universe with Stiff Matter and Decaying Vacuum Energy Density 