In the early universe, gravity may have been capable of creating light, a new theoretical paper finds.
Gravity can turn itself into light, but only if space-time behaves in just the right way, a research team has found.
With this well-known example in hand, a team of theoretical physicists, writing in a paper posted March 28 to the preprint database arXiv , asked if gravity itself could transform into other particles. We normally think of gravity through the lens of general relativity, where bends and warps in space-time influence the motion of particles. In that picture, it would be very difficult to imagine how gravity could create particles.
The researchers found that in this setup, gravitational waves — ripples in the fabric of space-time generated by collisions between the most massive cosmic objects — play an important role. Normally, gravitational waves are exceedingly weak, capable of nudging an atom through a distance less than the width of its own nucleus. But in the early universe, the waves could have been much stronger, and that could have seriously influenced everything else.
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