He could feel the Ξ-tensor humming in the quantum vacuum around him. The universe was holding its breath. Waiting.

It listed, in precise, forensic detail, the exact sequence of retro-causal edits that had been attempted by the previous universe's dominant species. A species that had called themselves "Human." A species that had tried to erase the Second World War. Then the First. Then the Bronze Age Collapse. Then the evolution of predation. Each edit made the universe younger, simpler, emptier. Until there was no intelligence left. Only a smooth, featureless CMB. A blank slate.

He opened the laptop again.

Ξ(t0) = ∫ ψ*(x) * H(t<-t0) * ψ(x) dx

Aris read the last line.

It now read: Encyclopedia of Cosmology, Volume I: The Self-Destruct Sequence of Sentience.

He was looking for a ghost. A PDF. The Encyclopedia of Cosmology, Volume VII: Observational Signatures of Pre-Bang Nucleosynthesis. He knew it didn't exist. He had co-authored the first six volumes before the collapse. Volume VII was the one they never wrote. The one the data refused to permit.

The screen went black. The basement went silent. The Ξ-tensor, for the first time in 4 million cycles, found no editor.

He knew what it was for. He was supposed to add his own chapter. His own edit. What would he erase? The night his wife left him? The grant rejection that broke his spirit? The moment he looked at the Hubble image and saw the truth?

"Rubbish," he whispered. Information cannot survive the Big Bounce. It’s thermodynamically annihilated. He had published three papers proving it.