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Shock waves may have jolted the infant cosmos. Clumpiness in the density of the early universe piled up into traveling waves of abrupt density spikes,
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, or shocks, like those that create a sonic boom, scientists say.
Although a subtle effect, the shock waves could help scientists explain how matter came to dominate antimatter in the universe. They also could reveal the origins of the magnetic fields that pervade the cosmos. One day,
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, traces of these shocks,
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, in the form of gravitational waves, may even be detectable.
Scientists believe that the early universe was lumpy — with some parts denser than others. These density ripples,
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, known as perturbations, serve as the seeds of stars and galaxies. Now,
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, scientists have added a new wrinkle to this picture. As the ripples rapidly evolved they became steeper, like waves swelling near the shore,
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, until eventually creating shocks analogous to a breaking wave. As a shock passes through a region of the universe, the density changes abruptly,
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, before settling back down to a more typical, slowly varying density. “Under the simplest and most conservative assumptions about the nature of the universe coming out of the Big Bang, these shocks would inevitably form,
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,” says cosmologist Neil Turok of the Perimeter Institute for Theoretical Physics in Waterloo, Canada.
In a paper published September 21 in Physical Review Letters, Turok and Ue-Li Pen of the Canadian Institute for Theoretical

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