jmL²I find the idea of cyclic universe intriguing.
https://www.youtube.com/watch?v=FVDJJVoTx7s
The idea under it is Conformal geometry.
https://www.youtube.com/watch?v=J8sZ1vsWi58
https://whatsonchain.com/tx/216559cad7028b7bfc7a371e5f0fce9e14e5f8f2cde53b4d5dc6dde9f747249f