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Sat 23 May, 2026 12:53 pm
In addressing the problem of a galaxy’s movements, shape and speed of rotation, rather than the cause being that the gravity of the galaxy is greater than expected, and hence the need to infer dark matter, is it possible the same results could arise through external pressure being applied to the galaxy? Could that pressure be applied by expanding space-time? Is it possible that, from the Big Bang on, new space-time may be entering the universe, constantly, pushing things apart, and powering the expansion of the universe, rather than dark energy? This would happen in places of least gravity. If one of these places were observed, could light passing by it look similar to that passing a large object? Could there be a circular, possibly standing wave of distorted space-time around it, which might have a different refractive index to, er, "other" space-time?
@Mark L,
Dark matter and dark energy solve different problems. Dark matter is inferred mainly from galaxy rotation curves and gravitational lensing: galaxies behave as though they contain more gravity-producing mass than we can see. Dark energy is inferred from the accelerating expansion of the universe.
A pressure from “new spacetime entering” would not reproduce the observed effects well. In general relativity, pressure itself contributes to the curvature of spacetime and therefore helps generate gravity, but it would not create the specific stable, halo-like gravitational patterns observed around galaxies and clusters. Also, empty regions do not behave like optical media with refractive indices; gravitational lensing comes from spacetime curvature caused by mass and energy, not from waves or “incoming spacetime.”
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