WHY is it that anything that has mass has gravity? Give reference to antimatter

Question

WHY is it that anything that has mass has gravity? Give reference to antimatter

Answer 1

Matter cause the warping of space, this results in the properties of gravity, there is no link with this and anti matter.

Answer 2

Einstein related the curvature of space-time to the presence of energy, in his General Theory of Relativity (1915). It is the curvature of space-time that we call gravity. Einstein expressed this in his field equation of gravity, which in the tensor form is: -

G = 8πT

Where the Einstein tensor G describes the curved space-time or gravity and the energy tensor T encapsulates all of the energy, present, creating that curvature.

In an earlier paper, Einstein had shown that mass and energy were equivalent in the famous equation: -

E = mc²

Thus, all matter whether it is anti-matter or matter is energy in a 'condensed' form. Since, all energy has a mass equivalence both matter and anti-matter result in attractive gravity according to Einstein’s field equation.

However, there may exist a repulsive form of gravity. I will try to explain!

After publishing his General Theory of Relativity in 1915, Einstein explored the consequences of his gravitational field equation. In a paper titled 'Kosmologische Betrachtungen zur allgemeinen Relativitatsctheorie' (Cosmological Considerations on the General Theory of Relativity) published in 1917, Einstein found that to model a steady state universe, which was the then favoured model, he had to bastardise his field equation into the parameterised form: -

G(μν) - λg(μν) = -κ(T(μν) - ½g(μν)T)

Where the constant(?) 'λ' is the cosmological constant or a 'fudge factor' that Einstein introduced to make his field equation work for a steady state universe. When Edwin Hubble discovered, in 1925, that the universe was expanding, Einstein commented that this constant was the greatest blunder of his life. It seems that Einstein ignored the implications, implicit, within his field equation that the universe is expanding!

However, a modern interpretation of this constant is that it represents a repulsive aspect to the gravitational force. The repulse force could be viewed as anti-gravity!

Wikipedia, the free encyclopaedia comments, 'In 1998, observations of type Ia supernovae ("one-A") by the Supernova Cosmology Project at the Lawrence Berkeley National Laboratory and the High-z Supernova Search Team suggested that the expansion of the universe is accelerating'. This acceleration is attributed to the presence of 'dark energy'. However, Wikipedia, the free encyclopaedia further comments, '...the simplest explanation for dark energy is that it is simply the "cost of having space": that is, a volume of space has some intrinsic, fundamental energy. This is the cosmological constant, sometimes called Lambda (hence Lambda-CDM model) after the Greek letter λ, the symbol used to mathematically represent this quantity. Since energy and mass are related by E = mc², Einstein's theory of general relativity predicts that it will have a gravitational effect. It is sometimes called a vacuum energy because it is the energy density of empty vacuum.....The cosmological constant has negative pressure equal to its energy density and so causes the expansion of the universe to accelerate...'

P.S Has somebody, above, been eating too many low gravity mushrooms?

Answer 3

reference: antimatter

There is no real link to gravity through antimatter. Since most antimatter is null and void in the universe...we don't have anything really, or do we?

You have to look at the obvious, which is all around us, wavelengths and frequencies. Matter to energy, energy to matter. All things vibrate, right down to the atoms and further down to the quantum field.

Answer 4

Gravity fairies flap their wings and make gluotrons that push masses closer together.

As long as you have omegasigron equilibrium between matter and antimatter, it's pretty straightforward. But if the oersted limiting condition isn't met, they can go into felinsys.

Here's a more through description of how it works:

http://answers.yahoo.com/question/index;...

Answer 5

You're getting very close to asking what mass really IS.  That's a hard one.  It's mass. We know what it is intuitively, we can measure it, though to get into the physics of the difference between mass and energy is pretty deep thinking.   So, at a more manageable level, gravity is a force that acts between masses, by definition.  The mass of the object is a quantity in the equation for the gravitational force.  Therefore, anything that has mass has gravity.

Antimatter (positrons, antiprotons etc) have reversed properties of their matter counterparts, but they also have mass.  They have identically the same mass as their matter counterparts.  Therefore, they are affected by gravity exactly the same way as matter.  When antimatter meets matter, though, the two annihilate and produce pure energy, which has no mass and therefore no gravity.  

Answer 6

It just does, that's the observation.

Answer 7

Gravity field is defined with a natural parameter, and that is mass, its nothing special, it just a parameter