Eternal Inflation

A cosmological theory positing that the rapid, exponential expansion of spacetime known as cosmic inflation is not a single, one-time event but an endless, self-reproducing process. It suggests our observable universe is merely one "pocket" within a vast, ever-expanding multiverse. Many proponents of cosmic inflation say it almost inevitably begets an infinite number of universes. This is because inflation, once it starts, never seems to stop completely. While inflation ended in our region, forming our familiar cosmos, it continues eternally in the broader background, constantly spawning new, disconnected pocket universes with potentially different physical laws and constants. Thus, eternal inflation casts, our universe as a single bubble in an endless multiverse sea. This framework naturally explains the sheer size and uniformity of our universe while also providing a mechanism for a multiverse, turning fundamental constants into local, environmental conditions rather than absolute, fine-tuned necessities.