I'm confused, "It is expected that at least one string per Hubble volume is formed." (10^31 cubic light years.) ... one string per an observable universe?
The observable universe is much larger than the hubble volume. I understand this to be due to changes in the rate or expansion of the universe over time, though I'm no astronomer myself.
The amount of "observable universes" would be at what number given that each one is a string? How many potential strings from the initial moment? Seems... just mind boggling.