Wild New Study Suggests Gravity Can Exist Without Mass

What is gravity without mass? Both Newton's revolutionary laws describing its universal effect and Einstein's proposal of a dimpled spacetime, we've thought of gravity as exclusively within the domain of matter.

Now a wild new study suggesting that gravity can exist without mass, conveniently eliminating the need for one of the most elusive substances in our Universe: dark matter.
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The latest offering in that vein comes from astrophysicist Richard Lieu at the University of Alabama in Huntsville, who has suggested that rather than dark matter binding galaxies and other bodies together, the Universe may contain thin, shell-like layers of 'topological defects' that give rise to gravity without any underlying mass.

Lieu started out trying to find another solution to the Einstein field equations, which relate the curvature of space-time to the presence of matter within it.

https://www.sciencealert.com/wild-new-study-suggests-gravity-can-exist-without-mass