# Is Gravity Caused by Pressure and Matter Repelling Dark Matter?

• Pronoein
In summary: It is also not a viable alternative to Newtonian gravity.The theory of gravity as a mechanical negative pressure would be more or less this way (in lay terms, sorry!):1. There is a constant multidirectional shower of particles which creates a constant pressure.2. Matter is opaque to these particles and create a multidirectional shadow.3. Two overlapping shadows create a straight path of lowest pressure between the centers of the matter particles.4. Particles of matter are then pushed towards and along these geodesics, and thus seem reciprocally attracted.
Pronoein
Hello, this is an incredible simple question but I couldn't find an answer by myself.

Is there a theory where gravity is a pressure and particles of matter low-pressure areas? (the pressure field could come from the overwhelming presence of a matter-repelling dark matter).

Dark matter does not repel, it also attracts, as anything with positive energy.

I am not sure it is an incredible simple question. Wheeler did formulate something equivalent to the idea contained in your question. For more details check the book "Gravitation" (a reference). -I don't remember exactly the page-

Pronoein said:
Hello, this is an incredible simple question but I couldn't find an answer by myself.

Is there a theory where gravity is a pressure and particles of matter low-pressure areas? (the pressure field could come from the overwhelming presence of a matter-repelling dark matter).

Yes, but that doesn't make any such theory a serious contender.

Phrak said:
Yes, but that doesn't make any such theory a serious contender.

Equation of state for vacuum: pressure + volumetric density of matter = 0. The only serious remaining question: does the vacuum gravitate? Since matter does... and since, in vacuum, volumetric density of matter and pressure seems to be the same (up to a minus sign) ...

Such models are generally grouped under the umbrella term 'http://en.wikipedia.org/wiki/LeSage_gravity" ', and are not considered a viable alternative to Newtonian gravity (not to mention being flat out inconsistent with general relativity).

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S.Daedalus said:
Such models are generally grouped under the umbrella term 'http://en.wikipedia.org/wiki/LeSage_gravity" ', and are not considered a viable alternative to Newtonian gravity (not to mention being flat out inconsistent with general relativity).

How do you then explain the observed acceleration (expansion) of our universe?

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S.Daedalus said:
Such models are generally grouped under the umbrella term 'http://en.wikipedia.org/wiki/LeSage_gravity" ', and are not considered a viable alternative to Newtonian gravity (not to mention being flat out inconsistent with general relativity).

So it has a name and even a wiki page. I was wondering about that, thanks.

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Thank you for your answers. The Lesage theory is interesting.
I understand that the theory of gravity as a mechanical negative pressure would be more or less this way (in lay terms, sorry!):
1. There is a constant multidirectional shower of particles which creates a constant pressure.
2. Matter is opaque to these particles and create a multidirectional shadow.
3. Two overlapping shadows create a straight path of lowest pressure between the centers of the matter particles.
4. Particles of matter are then pushed towards and along these geodesics, and thus seem reciprocally attracted.

Blackforest said:
Equation of state for vacuum: pressure + volumetric density of matter = 0. The only serious remaining question: does the vacuum gravitate? Since matter does... and since, in vacuum, volumetric density of matter and pressure seems to be the same (up to a minus sign) ...
Are those facts true? Volumetric density of matter and pressure are in equilibrium in vacuum? Is it correct to say that in this case gravity is expressed as a negative pressure?

As pointed out above, LeSage gravity is inconsistent with observations.

## What is "Gravity through pressure"?

"Gravity through pressure" is a concept in physics that describes how pressure can cause objects to be attracted to one another. This is due to the fact that pressure creates a gradient in the surrounding space, causing objects to move towards areas of higher pressure.

## How does pressure affect gravity?

Pressure can affect gravity by creating a gradient in space, causing objects to move towards areas of higher pressure. This can lead to objects being pulled towards one another, resulting in a gravitational force between them.

## What are some examples of "Gravity through pressure"?

Some examples of "Gravity through pressure" include the formation of stars and planets in the universe, as well as the movement of objects in Earth's atmosphere. Pressure also plays a role in the formation of ocean currents and the flow of air in weather systems.

## Is "Gravity through pressure" related to the theory of general relativity?

Yes, "Gravity through pressure" is related to the theory of general relativity. In this theory, gravity is described as the curvature of space-time caused by the presence of mass and energy. Pressure and its effects on the surrounding space are also taken into account in this theory.

## Can "Gravity through pressure" be observed in everyday life?

Yes, "Gravity through pressure" can be observed in everyday life. For example, when we sit on a chair, the weight of our body creates pressure on the chair, causing it to compress and support our weight. This is an example of gravity through pressure in action.

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