Is the Multiverse Theory Science Fiction or Science Fact?

Parallel universes could exist, whether cosmologists can prove it or not.  https://www.discovermagazine.com/the-sciences/is-the-multiverse-theory-science-fiction-or-science-fact

https://www.amazon.com/Simulation-Theory-Scratching-Jason-Barnett-ebook/dp/B07TJBM4NQ/ref=pd_sbs_6?pd_rd_w=rvSta&pf_rd_p=c52600a3-624a-4791-b4c4-3b112e19fbbc&pf_rd_r=N123PZ3KYH9JBDDB0102&pd_rd_r=644d47a0-27bc-4cfb-885c-f811396d3b1b&pd_rd_wg=9Y1wA&pd_rd_i=B07TJBM4NQ&psc=1

https://www.amazon.com/falling-down-rabbit-hole-Hypothesis-ebook/dp/B07CKR1GBB/ref=pd_sim_3?pd_rd_w=LQT71&pf_rd_p=ebcf67b7-c067-4864-a00f-469c4ba3831d&pf_rd_r=N123PZ3KYH9JBDDB0102&pd_rd_r=644d47a0-27bc-4cfb-885c-f811396d3b1b&pd_rd_wg=9Y1wA&pd_rd_i=B07CKR1GBB&psc=1

https://www.technologyreview.com/2012/12/04/84714/why-the-universe-is-not-a-computer-after-all

tnor