Q&A: An infinite universe causing our universe in a "bounce" still faces the same problems — an infinite past of cycles can't be traversed, and a meta-timeline outside ours would need its own cause.

Braxton addresses both cyclical models (expanding/contracting universe) and meta-timeline models. Cyclical models still require traversing an infinite series of past events. A meta-timeline outside ours would face identical infinite-past problems. Both just push the problem back one step.