The theory of multiverses has been a subject of discussion among physicists for years now. It dates back to the year 1929 when this man called Edwin Hubble shattered the prevailing belief of a static universe by discovering that galaxies are moving away from each other, this is what we call the 'Big Bang' theory as it suggests that everything began at one point. This theory was later developed by an American physicist, Alan Guth, and a soviet union astrophysicist, Alexei Starobivsky, each independently proposing the 'theory of Cosmic inflation'.
The Cosmic inflation theory states that during the first fraction of a second after the Big Bang, the Universe went through an extremely rapid expansion called 'inflation'. A 'Scaler field' present throughout space caused this inflation. This inflation ends when the scaler field decays, when it decays its energy is transformed into subatomic particles that fill the universe. After the decay, the universe continues to expand but nowhere near as fast as during the Cosmic inflation. This theory is the most commonly accepted version of the big bang theory as a number of model predictions have been confirmed by observations.
However, if we accept Cosmic inflation, there is no reason to assume that inflation ever ended throughout all of space. You see, the scalar field responsible for inflation doesn't decay everywhere at the same time, and each time it decays in one location it creates what seems to be a Big Bang in that location. This creates what scientists call 'Bubble universes' and they expand without the speed of inflation, while the space between the bubble universes expands much faster due to the fact that the scalar field is still intact. Therefore, new bubble universes continue to be created at an exponentially increasing rate. This eternal inflation theory does not violate the 'conservation of energy' as the ever-increasing positive energy from the matter and radiation are balanced by the ever-increasing negative energy from the gravitational field. It also happens to suggest that there was a beginning to everything which many speculate is a higher power.
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