The universe was born as a spacetime bubble that popped up inside an even bigger metaverse. In March 2013, the Planck probe made the highest-resolution cosmic microwave background (CMB) map yet. Andrew Liddle of the University of Edinburgh in UK, and colleagues sought an explanation. They went back to a theory published in 2008 by Sean Carroll and colleagues at the California Institute of Technology in Pasadena, which suggested that the small variations are superimposed on a disturbance spanning the observable universe, like small waves carried on a big ocean wave. Liddle and colleagues have shown that when inflation happens in a bubble universe, it naturally gives rise to large disturbances in spacetime that could account for the lopsided CMB.
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