is that where suggested the concentric rings on the wmap image were left over gravitational waves?
Rebel biscuit stercore sumus et nos esse novimus,
Fri 23 Sep 2011, 23:50,
archived)
YepThey never actually explained where the concentric rings were meant to have come from, and they used some really weird statistics where they compared everything with white noise rather than with simulated maps. That's like looking for discrepancies in a recording of a Beatles track by comparing it with white noise rather than a reasonably precise cover version. Or like looking for yellow blocks in a field of blue instead of a field of random colour. The papers were not well received - which isn't entirely Penrose's fault; he's never pretended to be an observational cosmologist nor a statistician.
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boris the spider,
Fri 23 Sep 2011, 23:54,
archived)