Establishes stability of tilted two-fluid Bianchi I spacetimes, indicating their important role in cosmological modeling.
We establish the nonlinear stability to the future of tilted two-fluid Bianchi I solutions to the Einstein–Euler equations with positive cosmological constant and linear equations of state p₍ₐ₎=K₍ₐ₎ρ ₍ₐ₎ p ( a ) = K ( a ) ρ ( a ) , a∈ \1,2\ a ∈ { 1 , 2 } , where 1/3<K₍ₐ₎<5/7 1 3 < K ( a ) < 5 7 .
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Fournodavlos et al. (2026) studied this question.
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