Some Hidden Structure in BKL
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✦ hep-th
gr-qc
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applicationapproachesbehavesbelinskiiclassicdamourfindhenneaux
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The way spacetime behaves as one approaches a spacelike singularity is re-investigated. We find a simple twistorial presentation that includes and simplifies the classic work of Belinskii, Khalatnikov and Lifshitz as well as the more recent results of Damour, Henneaux and Nicolai. We speculate on the application of our technique to the E{10} programme of M-theory.
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The free boundary problem in general relativity
Treating singularities as free boundaries in the Einstein-Hilbert action yields boundary conditions excluding Kasner/BKL spacetimes while admitting conformally regular FLRW cosmologies sourced by 0 ≤ P < ρ fluids with...
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