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An extension of Einstein’s relativity into higher-dimensional spaces, exploring how the geometry of more-than-four-dimensional spacetime affects gravity, light, and the structure of the universe. It asks: how do Lorentz transformations work in N dimensions? What do black holes look like when space has extra curled‑up directions? How does the cosmological constant emerge from higher‑dimensional curvature? The theory is a playground for mathematical physicists seeking to unify general relativity with quantum field theory, and it often appears in speculative discussions about the nature of reality, hidden universes, and the possibility that our 4D world is a “brane” floating in a higher‑dimensional bulk.
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