Here are some possibilities that might be related:
* Oscillating Universe Theory: This theory suggests that the universe undergoes cycles of expansion and contraction, with a Big Bang marking the start of each cycle. It's a less popular theory than the current standard cosmological model, which favors an eternally expanding universe.
* Cyclic Universe Theory: Similar to the Oscillating Universe theory, but it doesn't necessarily involve a Big Bang at the start of each cycle. Instead, it proposes a continuous cycle of expansion and contraction driven by different physical mechanisms.
* Quantum Fluctuation Theory: This theory proposes that the universe originated from a quantum fluctuation in a pre-existing vacuum state.
* String Theory: While not a direct theory about the universe's origin, String Theory posits the existence of tiny vibrating strings as fundamental building blocks of reality. Some interpretations of String Theory suggest the possibility of multiple universes, which might be related to the idea of oscillations.
Please provide more context or details if you can recall them, and I can try to help you identify the specific theory you are thinking of.
