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The Conversation

David Wiltshire, Professor of Theoretical Physics, University of Canterbury

Cosmological models are built on a simple, century-old idea -- but new observations demand a radical rethink

Universe Albert Einstein Radiation

Fosalba & Gaztañaga 2021, MNRAS, CC BY-SA

Our ideas about the Universe are based on a century-old simplification known as the cosmological principle. It suggests that when averaged on large scales, the Cosmos is homogeneous and matter is distributed evenly throughout.

This allows a mathematical description of space-time that simplifies the application of Einstein’s general theory of relativity to the Universe as a whole.

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