
20191209: The Doomsday Argument
 15:07: That means it's also possible to produce a closed, positively curved bubble universe within an infinite inflating multiverse.


20191111: Does Life Need a Multiverse to Exist?
 12:04: ... Linde’s eternal inflation is perhaps the most popular  bubble universes forming in a larger exponentially expanding spacetime, and in each ...


20190930: How Many Universes Are There?
 00:06: But just how many bubble universes does the eternally inflating multiverse contain?
 00:34: But in the eternal inflation picture, ours is just one among uncountable bubble universes.
 02:18: Some questions spring to mind:  I mean, besides “What?!?” For example, how many bubble universes can be made this way?
 02:52: ... challenge question I asked you to calculate the RELATIVE number of new bubble universes that formed in one second compared to the previous ...
 03:05: We assumed that there’s a fixed but unknown probability that a bubble universe will form in any given volume of inflating space.
 03:21: So the rate at which that volume is increasing is the same as the rate at which bubble universes multiply.
 04:44: And our number of new bubble universes should multiply by the same insane factor each second.
 05:33: Here’s another one: do all of these bubble universes the same laws of physics, or could they be wildly different from each other?
 06:43: Here’s a possible explanation: what different bubble universes can end up with different vacuum energies?
 06:51: ... vacuum energies like ours might be extremely rare, but there are so many bubble universes that at least some will have a low enough cosmological constant for life ...
 11:29: He proposes that there may be something off in the logic of weighing up probabilities over bubble universes.
 14:43: Alexander has been traveling the bubble universes for many years, supporting local youtube space shows where he finds them.


20190826: How To Become an Astrophysicist + Challenge Question!
 08:59: ... process goes on forever but inflation also has a beginning. So how many bubble universes exist ...
 10:46: ... new universe forming in any given volume of space So every second many bubble universes are forming across the great sir Eternally, inflating spacetime and ...


20190819: What Happened Before the Big Bang?
 09:06: ... a fractal structure of infinitely expanding space in dispersed with bubble universes of all different ...


20190806: What Caused the Big Bang?
 12:49: eternally  Only stopping in patches where a bubble universe forms. And once started, inflation should produce infinite such universes.


20190718: Did Time Start at the Big Bang?
 09:52: ... We'll get to the nittygritty of that with its inflow tongs and bubble universes real soon There are also various cyclic universe options the first ...


20190306: The Impossibility of Perpetual Motion Machines
 11:13: ... outlandish goes to Epsilon Centauri, whose machine requires an entire bubble universe with closed, pacman borders, trapping the everaccelerating ...


20170621: AntiMatter and Quantum Relativity
 13:12: ... username asks whether colliding universes in the bubble universe scenario means that we redefine "universe" to be the bounded ...
 13:34: But this bubble universe idea does suggest a greater universe beyond our bubble.
 13:50: Galdo145 asks whether bubble universes with different vacuum energies would convert to the lower energy state after colliding?


20170607: Supervoids vs Colliding Universes!
 09:22: This can happen spontaneously anywhere in the greater inflating space time, resulting in bubble universes.
 09:37: But regardless, in an infinitely inflating space time, collisions between bubble universes are eventually expected.
 09:45: So what happens when two bubble universes collide?


20161012: Black Holes from the Dawn of Time
 03:21: For example, the collapse of cosmic string moves and the collision of bubble universes?


20150930: What Happens At The Edge Of The Universe?
 07:22: Now, bubble universes may be finite in size regardless of internal geometry.
