MULTIVERSE

A hypothetical collection of various universes is known as the multiverse.All of space, time, matter, energy, information, and the physical laws and constants that characterise them are thought to be present in these universes together. Parallel universes, other universes, alternate universes, or many worlds are all terms used to describe the several realities that make up the multiverse. One typical idea is that the multiverse is a "patchwork quilt of separate universes all bound by the same laws of physics.
With roots in ancient Greek philosophy, the idea of several realities, or a multiverse, has been debated throughout history. It has changed over time and has been a topic of discussion in a number of disciplines, including cosmology, physics, and philosophy. Because it cannot be empirically refuted, some physicists contend that the multiverse is a philosophical idea rather than a scientific hypothesis. Within the physics world in recent years, there have been believers and detractors of multiverse hypotheses. Although some researchers have looked through data in quest of proof for extra dimensions, no statistically meaningful proof has been discovered. Critics claim that the multiverse notion poses unresolved metaphysical concerns and lacks the testability and falsifiability necessary for scientific research.
For multiverses and universes, Max Tegmark and Brian Greene have suggested many classification schemes. Level I is an extension of our universe, Level II is universes with various physical constants, Level III is the many-worlds interpretation of quantum physics, and Level IV is the ultimate ensemble in Tegmark's four-level classification. Quilted, inflationary, brane, cyclic, landscape, quantum, holographic, simulated, and ultimate multiverses are among Brian Greene's nine varieties. In order to explain the existence and interactions of numerous worlds, the theories investigate diverse spatial dimensions, natural laws, and mathematical structures. Twin-world models, cyclic theories, M-theory, and black-hole cosmology are a few further multiverse theories.

Fun Facts About Multiverse
According to multiverse hypothesis, our universe, which spans tens of billions of light-years and contains hundreds of billions of galaxies and virtually innumerable stars, may not be the only one. Instead, there might be a completely distinct universe, far away from ours, and then another, and another. In fact, there might be an infinite number of universes, each with its own set of physical laws, stars and galaxies (if they can exist in those worlds), and perhaps even intelligent civilizations.

Types of Multiverses
•The Common Origin Model: In the case of the common origin model, multiple universes have a single origin. Moreover, they are considered to be interacting with each other.
•The disconnected model :The multiverse is proposed by some scientists which shows that the parallel universes have independent origins but they cop-exist easily with similar reality. This hypothesis fully stands with the support of the modal realism theory. 
•The Quantum Gravity Model: The quantum gravity model is yet another approach to prove the existence of a multiverse that is more connected to one another. This approach mainly stands on the general relativity theory of Albert Einstein and verses of quantum mechanics.