Introduction
The multiverse is a hypothetical concept of the existence of multiple universes . It is a conjunctural collection or a set of universes that may exist beyond the observable universe. The concept of the multiverse propels the idea that our universe is just one out of the many universes, with it's very own laws, working principles, energy, matter, civilizations etc.Hugh Everett III introduced the “Many-Worlds Interpretation” in 1957, proposing that every possible outcome of a quantum event gives rise to a separate universe. The American philosopher and psychologist William James used the term "multiverse" in 1895 referring to the confusing moral meaning of natural phenomenon .
Historical Background
Mentions of this concept of multiple universes have been alluded in Greek philosophy and has been discussed throughout history. All the current understanding of how the universe got here, tell there are plenty of other universes, which is the multiverse idea. The idea is when the universe begun, cosmic inflation caused the big bang, it may have created a number of different universes at the same time. As the space in between each of them is always growing so they can never interact, leading to an infinite number of parallel universes each with their own law of physics
Classifications of Multiverses
The multiverses and universes have been classified by Max Tegmark and Brian Greene.
Max Tegmark's Four Levels of Multiverse
Tegmark classified multiverse into four levels. His four level classification consists of :
1.Level I : an extension of our universe;
2.Level II: universes with different physical constants;
3.Level III: many-worlds interpretation of quantum mechanics and;
4.Level IV: ultimate ensemble.
Brian Greene's Nine Types of Multiverse
Brian Greene's classification includes 9 types of multiverses , comprising of :
1.Quilted Multiverse: the universe is thought of as a quilt and each square is its own bubble universe.
2.Inflationary Multiverse: cosmological model that proposes that the universe expanded rapidly after the Big Bang, creating a vast, complex spacetime called the inflationary multiverse.
3.Brane Multiverse: suggests that our universe is a membrane, or brane, that floats in a higher-dimensional space, or bulk.
4.Cyclic Multiverse: a cosmological model that posits that the universe goes through endless cycles of expansion and cooling, beginning with a big bang and ending with a big crunch.
5.Landscape Multiverse: theory that suggests there are many possible universes, each with different physical laws and constants, that make up a vast landscape.
6.Quantum Multiverse: a hypothesis that suggests that every quantum event creates a new universe for each possible outcome.
7.Holographic Multiverse: a physics concept that suggests the universe is encoded on a two-dimensional surface, similar to a hologram.
8.Simulated Multiverse: concepts that expand the idea of reality beyond a single universe.
9.Ultimate Multiverse: contains every mathematically possible universe under different laws of physics.
COnclusion
The existence of a multitude of universes, each with different physical laws, could explain the asserted appearance of making small adjustments in order to achieve the best or a desired performance of our own universe for conscious life as proposed by the anthropic principles . The weak anthropic principle posits that we exist in one of the few universes that support life.
The Multiverse