No Dark Matter: It's Only Regular Matter

[greenj]

"A study done several years ago showed that the universe's energy is decreasing. What if gravity, too, has been getting weaker?"
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Dark matter, in a nutshell, is a theoretical force envisioned by scientists that would explain the behavior of galaxies that seem to be spinning fast enough for some of their stars to fly out of their orbits but do not. For galaxies to remain intact they would have to have a greater gravitational pull than their visible mass suggests. Scientists therefore theorized, as far back as the 1930s, that there must be some invisible matter -- dark matter -- that's holding galaxies together.

The problem is that as hard as we try to detect dark matter we cannot. And despite other theories to explain galaxies' behavior, their rapid spin remains a mystery.

I'd like to propose a new theory that might shed some light on all this. A study done several years ago showed that the universe's energy is decreasing. What if gravity, too, has been getting weaker? Not necessarily in lockstep or conjunction with the universe's energy, or, perhaps there is a connection. Regardless, a diminishing gravity scenario -- where gravity has been steadily declining since the beginning of time -- would explain what appears to be dark matter.

How?

When we look into the sky we see objects as they were many years ago. The additional gravity needed to hold a galaxy together actually was there at that time in the past. So when we calculate its gravitation pull based on today's gravitational strength we come up short and assume there must be some kind of dark, invisible matter.

What's more, a diminishing gravity theory also explains another puzzle that presents itself with the dark matter theory. Different celestial objects seem to have a vastly disproportionate amount of dark matter. Pretty difficult to explain.

With the diminishing gravity theory, however, even this problem disappears. Different celestial objects have different gravitational pulls because they formed at different times in the past and, therefore, actually had different gravitational strengths.

Furthermore, there's an additional factor that would give heavenly objects greater gravitational pull than their sizes would suggest. Under a greater gravitational pull these objects would have coalesced with greater force and into more compact objects, giving them even greater gravitational pull than the same size objects compacted under weaker gravity. In this more compact form, these objects may very well exert greater gravity even today than other objects of the same size. This diminishing gravity theory is explained in more detail in "The V-Bang: How the Universe Began."

What this boils down to is that older celestial objects will generally have greater gravity and therefore appear to have more dark matter. The relationship between distance from earth and age, however, is not as straightforward as current theory holds. This is also explained in detail in "The V-Bang."

[Strange]

A study done several years ago showed that the universe's energy is decreasing.

 

 

Citation needed.

 

 

 

Regardless, a diminishing gravity scenario -- where gravity has been steadily declining since the beginning of time -- would explain what appears to be dark matter.

 

 

Have you calculated how much gravity would need to decrease with time? For example looking distances to galaxies in our local cluster?

 

However, I can see a couple of problems:

 

1. It is not enough to just have less gravity - that would just cause the galaxies to rotate ate a different speed and/or be larger. Current modified gravity theories to explain dark matter make gravity decrease at slightly less than an inverse square law. This can be made to work for galaxies but not galaxy clusters (and vice versa).

 

2. It would result in the amount of apparent dark matter increasing with distance. Have you checked the observational data to see if this is the case?

[Sensei]

When we look into the sky we see objects as they were many years ago. The additional gravity needed to hold a galaxy together actually was there at that time in the past.

 

Milky Way has diameter approximately 180,000 light years. Solar System is ~ 27,000 light years away from the center.

So what you can see from Southern Hemisphere (that's direction to the center of galaxy, and further) is ~180/2+27=117 kly.

Light from these stars have been emitted just up to 120,000 years ago. From the center of galaxy 27,000 years ago.

 

Compare with age of Earth, age of Solar System, age of Milky Way.

 

In so small amount of time, you would have barely visible movement of continents on the Earth. And you are dreaming about serious change of gravitational force?

[Vince 49]

In the last few years it has become possible to create images of dark matter using weak gravitational lensing. The image at the first link below was on the cover of Nature some years ago.

 

The lensing theory, including cosmic shear, is rather complicated. You can find a reasonably detailed explanation on Wikipedia--see the second link. Below is a rather simplified version of how it works.

 

You build up the image in slices. All the galaxies at a given Z (red shift) are the same distance from Earth, corresponding to one slice. The average elliptical eccentricity of tens of thousands of these galaxies will be very close to zero. However, if there is a significant gravitational field, the galaxies will appear to be slightly elongated in the direction of the gravitational force, providing some information about the magnitude and direction of what ever is creating the gravitational field. Repeat this for a range of Zs, and you can build up a three-dimensional image, such as that shown in the attachment below.

 

These results provide rather convincing evidence that there is something massive out there, that is invisible in the electromagnetic spectrum.

 

Link to 3D image of dark matter: https://goo.gl/images/hBq2H3

 

Link to Wikipedia entry on weak gravitational lensing: https://en.wikipedia.org/wiki/Weak_gravitational_lensing