Regarding the Dark Matter mystery in astrophysics - do we need to change the law of gravity (think MOND aka MOdified Newtonian Dynamics) or accept that there is unknown, extra mass in the universe?

We may not have gravity entirely right and also, there may be extra mass in other dimensions which interact with ours. Albert Einstein might give us a clue to getting gravity right, because he thought of gravity as a push caused by the warping and curvature of space-time, not as a pull. This "push" interpretation was popular as recently as the 1960s when a scientist described it this way in World Book Encyclopedia. Einstein could also give clues to understanding dark matter through General Relativity, E=mc^2, and a paper published 3 or 4 years after general relativity.

The push interpretation could explain Earth's tides this way. All the water in the oceans is being pushed towards Earth’s centre at 32 feet per second every second. But the seafloor prevents its descent. So there is a recoil. This recoil is larger during the spring tides seen at full and new moon because Sun, Earth and Moon are aligned at these times. At the neap tides of 1st and 3rd quarter; the sun, earth and moon aren’t lined up but form a right angle and our planet has access to more gravitational waves, which suppress oceanic recoil to a greater degree. We can imagine the sun and moon pulling earth’s water in different directions at neap tide but suppression is a more accurate description. If variables like wind/atmospheric pressure/storms are deleted, this greater suppression causes neap tides which are much lower than spring tides.

The extra mass in other dimensions (dark matter) might be regarded this way - If the propagation of photons and gravitons is indeed curvilinear (General Relativity says space-time is curved) and follows the circular path of Wick rotation, the energy inherent in space-time could pass from our real space-time on the x-axis to imaginary space-time on the y-axis then return to the x-axis, and on and on. The negative imaginary space-time below the x-axis might even be identified with science fiction’s subspace.

In 1919, Einstein published a paper asking if gravitation and electromagnetism play a role in formation of elementary particles. It isn't outdated by discovery of the nuclear forces in the 1930s since adaptation of the paper reveals how it can describe the properties of the nuclear forces' bosons, and even the Higgs boson. This interaction of the axes, and repeated cycling through other dimensions, allows dark energy to form the mass known as dark matter by obeying E=mc^2 i.e. the photons and gravitons of “dark” electromagnetism and “dark” gravitation would interact. This model challenges the prevailing notion of dark energy as the driver of universal expansion. Instead, it posits a potentially groundbreaking view of the universe as a static entity.

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