**1. ****Quilted Multiverse**

Conditions in an infinite universe necessarily repeat across spa, yielding parallel worlds.

**2. ****Inflationary Multiverse**

Eternal cosmological inflation yields an enormous network of bubbles universes, of which our universe would be one.

**3. ****Brane Multiverse**

In string/M-theory’s braneworld scenario, our universe exists on one three-dimensional brane, which floats in a higher-dimensional expanse potentially populated by other branes-other parallel universes.

**4. ****Cyclic Multiverse**

Collisions between braneworlds can manifest as big bang-like beginnings, yielding universes that are parallel in time.

**5. ****Landscape Multiverse**

By combing inflationary cosmology and string theory, the many different shapes for string theory’s extra dimensions give rise to many different bubble universes

**6. ****Quantum Multivese**

Quantum mechanics suggests that every possibility embodied in its probability waves is realized in one of a vast ensemble of parallel universes.

**7. ****Holographic Multiverse**

The holographic principle asserts that our universe is exactly mirrored by phenomena taking place on a distant bounding surface, a physically equivalent parallel universe.

**8. ****Simulated Multiverse**

Technological leaps suggest that simulated universes may one day be possible.

**9. ****Ultimate Multiverse**

The principle of fecundity asserts that every possible universe is a real universe, thereby obviating the question of why one possibility – ours – is special. These universes instantiate all possible mathematical equations.