If you want universes that run on alternate topologies taken seriously, I mean, like, the maximum level of serious possible, you want Greg Egan. For instance,

If you want universes that run on alternate topologies taken seriously, I mean, like, the maximum level of serious possible, you want Greg Egan. For instance, Greg Egan seriously considering the nature of 2+2 universe, that is, two space, two time dimensions: https://www.gregegan.net/DICHRONAUTS/DICHRONAUTS.html https://www.gregegan.net/DICHRONAUTS/DICHRONAUTS.html (Don't miss the interactive simulation: https://www.gregegan.net/DICHRONAUTS/02/Interactive.html https://www.gregegan.net/DICHRONAUTS/02/Interactive.html ) He's got a few others, too.