No evidence of time before Big Bang.

Published online 10 December 2010 | Nature | doi:10.1038/news.2010.665


Latest research deflates the idea that the Universe cycles for eternity.


Edwin Cartlidge

Circular ripples in the cosmic microwave background have been making waves with theoreticians.



Our view of the early Universe may be full of mysterious circles — and even triangles — but that doesn't mean we're seeing evidence of events that took place before the Big Bang.


So says a trio of papers taking aim at a recent claim that concentric rings of uniform temperature within the cosmic microwave background — the radiation left over from the Big Bang — might, in fact, be the signatures of black holes colliding in a previous cosmic 'aeon' that existed before our Universe.



Dark Matter Halo



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