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The product spacetimes of constant curvature describe in Einstein gravity, which is linear in Riemann curvature, Nariai metric which is a solution of $\Lambda$-vacuum when curvatures are equal, $k_1=k_2$, while it is Bertotti-Robinson metric describing uniform electric field when curvatures are equal and opposite, $k_1=-k_2$.
H. Nariai, Sci. Rep. Tohoku Univ. 34
1951
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N. Dadhich, “Nariai metric is the first example of the singularity free model,” gr-qc/0106023. N. Dadhich, “Nariai metric is the first example of singularity free model,” arxiv:gr-qc/0106023
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2011
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