Before the Planck time of $10 ^{- 43}$ seconds, the Big Bang must be treated as a singularity, witheven general relativity yielding no information about it.

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Before the Planck time, the universe is believed to have been so small and dense that classical physics, including general relativity, breaks down, and quantum effects of gravity become significant, making it impossible to describe the state of the universe using our current understanding of physics.

Before the Planck Time Of 10−4310 ^{- 43}10−43 Seconds, the Big Bang Must Be Treated as a Singularity

Before the Planck Time Of $10 ^{- 43}$ Seconds, the Big Bang Must Be Treated as a Singularity