[Xmd5a]

Someone came up with a very similar theory (two arrows of time diverging from the same point, the big bang). They even gave their theory the same name: Janus.

https://januscosmologicalmodel.com/januspoint

There are other players concerned with similar ideas:

- Negative mass, Farnes: https://en.wikipedia.org/wiki/Dark_fluid

- Mirror-image universe going backwards in time from the big bang, Turok: https://www.newscientist.com/article/mg25734230-100-neil-tur...