Dark matter is a supersolid that fills 'empty' space, strongly interacts with ordinary matter and is displaced by ordinary matter. What is referred to geometrically as curved spacetime physically exists in nature as the state of displacement of the supersolid dark matter. The state of displacement of the supersolid dark matter is gravity.
The supersolid dark matter displaced by a galaxy pushes back, causing the stars in the outer arms of the galaxy to orbit the galactic center at the rate in which they do.
Displaced supersolid dark matter is curved spacetime.
Thanks for clarifying the properties of dark matter, @mpc755! Why is dark matter displaced by ordinary matter? Do we have any observations that confirm this property?
Observations of different galaxies also display different curve profiles for the orbital velocities of stars. Some galaxies have more or less constant velocity as distance to galaxy core increases, while others even display accelerating velocities as distance increases. How does displacement of dark matter account for this observed behaviour?
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