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Ambient gravity would be like the gravity balance at the common point that orbiting objects revolve around. Does ambient gravity produce a red shift?
Consider that diminished electromagnetic fields from photons permeate all of space, even that space that is inside matter. The reason the fields can permeate all space is that they are too weak to interact and so are almost invisible to matter. Photons moving through these diminished fields reach their saturation amplitude with the help of the fields. Saturation amplitude is therefore reached at an offset toward increasing field strength of the diminished fields. That is gravity according to photon-theory.Now, with that understanding we are faced with a new realization. The photon needs to transition through less overall amplitude to become saturated. This means that the peak to peak amplitude transition of the photon is less in a gravity field than it is outside the gravity field. Less peak to peak amplitude means less energy. So, a photon must lose energy to an ambient gravity field.This loss of energy must manifest itself as a shift in wavelength. The red shift is accumulative, so that once shifted the photon does not regain its lost energy. Some areas of the cosmos contain more ambient gravity than others. We should therefore expect the amount of red shift in light from distant objects to vary according to the amount and the density of gravity fields they penetrate.
When you consider that the equation for the measure of acceleration contains time as an element, and time is affected in a negative way by gravity, then gravitational acceleration must be affected in a negative way by gravity.
We might view this effect (if it exists!) as the dilution of gravity by matter.
The most direct observational evidence to date for dark matter is in a system known as the Bullet Cluster. In most regions of the universe, dark matter and visible material are found together, as expected because of their mutual gravitational attraction. In the Bullet Cluster, a collision between two galaxy clusters appears to have caused a separation of dark matter and baryonic matter. X-ray observations show that much of the baryonic matter (in the form of 107–108 Kelvin gas, or plasma) in the system is concentrated in the center of the system. Electromagnetic interactions between passing gas particles caused them to slow down and settle near the point of impact. However, weak gravitational lensing observations of the same system show that much of the mass resides outside of the central region of baryonic gas. Because dark matter does not interact by electromagnetic forces, it would not have been slowed in the same way as the X-ray visible gas, so the dark matter components of the two clusters passed through each other without slowing down substantially. This accounts for the separation. Unlike the galactic rotation curves, this evidence for dark matter is independent of the details of Newtonian gravity, so it is held as direct evidence of the existence of dark matter.