Slightly related, time travel has implications for the computation complexity: https://arxiv.org/abs/quant-ph/0309189 https://arxiv.org/abs/quant-ph/0309189, ht

Slightly related, time travel has implications for the computation complexity: https://arxiv.org/abs/quant-ph/0309189 https://arxiv.org/abs/quant-ph/0309189, https://www.scottaaronson.com/papers/ctc.pdf https://www.scottaaronson.com/papers/ctc.pdf.