Multiverse

Lore & Background

The concept of multiple universes has ancient antecedents. The pre-Socratic Greek philosopher Anaximander in the sixth century BCE may have suggested infinite worlds, though it is debated whether he believed in multiple co-existent or successive worlds. Ancient Indian Hindu and Buddhist thinkers also postulated multiple worlds. The first figures definitively attributed with the concept of innumerable worlds are the Ancient Greek Atomists: Leucippus and Democritus in the 5th century BCE, followed by Epicurus and the Roman Epicurean Lucretius. In the third century BCE, Chrysippus suggested the world eternally expired and regenerated, implying multiple universes across time. In the Renaissance, Giordano Bruno expressed the concept of infinite worlds.

Reader's Guide

In 2015, astrophysicist Dr. Ranga-Ram Chary analyzed cosmic radiation spectrum and found a signal possibly indicating a parallel universe, though he noted a 30% chance it is noise and that unusual claims require a very high burden of proof. Critics like Paul Davies and George Ellis argue multiverse hypotheses lack testability and falsifiability, comparing them to theological discussions. The anthropic principle is often invoked to explain the apparent fine-tuning of our universe, with proponents like Max Tegmark arguing the multiverse is simpler and more elegant.

Did You Know?

• Max Tegmark's four-level classification includes Level I: extension of our universe, Level II: universes with different physical constants, Level III: many-worlds interpretation of quantum mechanics, and Level IV: ultima
• Brian Greene's nine types of multiverses include quilted, inflationary, brane, cyclic, landscape, quantum, holographic, simulated, and ultimate.
• No statistically significant evidence of other universes has been found, despite analyses of data from the Wilkinson Microwave Anisotropy Probe and the Planck satellite.