Who has THE explanation on the Mechanism of Gravity?

Question

Clarification on FORCE = Force does not exist alone so is the same case with gravity force.Dont forces exist only in pairs as per Newton 3rd Law?

Isnt the problem with the defined graviton as a particle that moves at the speed of light?But isnt light photons that move only at the speed of light?

Was Einstein product of space time in his metric give really gravity mechanism explanation? and who Understands it?

Answer 1

DavidK93 gave some good references discussing our current understanding and current theories. General Relativity says that space is warped in the presence of mass, so there really is no mechanism, objects just move through space that happens to be warped near matter. Classical Newtonian gravitation lets us calculate the strength of the force. But it doesn't say why there is a force or how it works.

So, the most accurate answer to your question is that only God has THE explanation of gravity.

Answer 2

Great question, but no mechanism has been proven yet.

As per one theory "gravitons" are emitted by every atom and the bigger the object more "gravitons" emitted. Hence when two objects are present both of them emit "gravitons", now when these "gravitons" interact this causes the objects to move closer. I really wonder how, because if graviton meet at half the distance then who informs the objects to move !!!

other theory is gravity is due to space time curvature as per einstein.

i am starting to believe some thing on the lines of "gravitons" but still that too seem incomplete.

Answer 3

Every particle of matter in the universe is attracted to every other particle by a force called Gravity. The strength of the attraction is determined by the distance between the particles. The force can be thought of as a virtual particle called a Graviton. If two particles come together due to gravity, their mass and gravitational force are added together.

Answer 4

I am not sure what you mean by "Mechanism" I may be missing something here.

I never associated Gravity and Mechanism. Gravity is a force, not a mechanism. That force exists between any two masses or objects.

Two tall buildings exert a gravitational force between them. If I am not even in the ball park, perhaps you could explain a little more about what you are seeking.

Answer 5

The precise mechanism of gravity is one of the most important unanswered questions in physics. One major theory is that an undiscovered particle, called the graviton, is the carrier of the force. A major goal in science is to incorporate gravity into the grand unification theory, or GUTS, that would demonstrate that all four of nature's fundamental interactions, of which gravity is one, are aspects of a single elementary phenomenon.

Answer 6

First, let's look at what we mean by Newton's 3rd Law. Let's consider to particles p1 and p2 with masses m1 and m2 respectively. Now p1 exerts a gravitational force on p2, call it F12. But p2 also exerts a gravitational force on p1, call it F21. According to Newton's 3rd Law, F12 = -F21, i.e., the forces are equal and opposite. This is what we mean by "forces come in pairs." It doesn't mean that there is another force in the interaction besides gravity.

Now, let's talk a bit about gravity. According to Newton's Law of Gravity, gravitational interactions always and only occur between two massive bodies (by massive, I only mean a particle/body with mass not equal to zero). Newton offers no explanation for the mechanism of the force. This is ok, because as one responder suggests, physics doesn't always have to provide a mechanism. It just describes what it happens. This is especially true in classical physics. Newton's Law also suggests that the gravitational field is propagated instantaneously between the two bodies. In other words, the force of gravity between the Sun and Earth is instantaneously felt. If the Sun disapeared magically tomorrow (not explode, disappear), the Earth would immediately start traveling in a straight line since gravity would be turned off.

But, in 1905 when Einstein invented Special Relativity (SR), he showed that information cannot propagate faster than the speed of light. This meant that Newton's Law of gravity was incompatible with Relativity. It took another 10 years to figure out how to fix it. In 1915, Einstein published his Theory of General Relativity (GR), which fixed Newton's Law of Gravity by treating space-time (a concept from SR) as a geometrical surface (called a manifold). The theory not only made Gravity compatible with Relativity, it also provided a mechanism for gravity: Gravity was caused by the curvature of space (and the curvature of space was caused by gravity). This means that we no longer need to massive particles for gravity to have an effect. A single mass curves spacetime. Photons of Light, being massless, would travel on curved paths in a curved space. This was confirmed by experiment. GR also correctly explained one of the biggest thorns in the sides of astronomers at that time: the precession of Mercury's orbit. It also predicts that if the Sun disappeared, the Earth would not feel this disappearance for about 8 minutes (the time it takes for light and gravity to travel from the Sun to Earth). So we would keep going in a circle for 8 more minutes over Newton's prediction.

Also, about that time, Quantum Mechanics started to be developed, which eventually led to Quantum Field Theory (QFT). In QFT, the 4 forces of nature (well, 3 depending on how you count them) are described by an exchange of particles. For the Electromagnetic force, two charged particles exchange photons, which causes the particles to attract or repel depending on their charge. This has been experimentally confirmed in the sense that Quantum Electrodynamics is, to date, the best tested theory EVER. It agrees with experiment up to 9 decimal places (1 part in a billion - that's absurdly high, but true). Well, QFT also predicts the existance of the graviton. The graviton hasn't been "discovered," but I've never heard of a physicist doubting its existance. Since the graviton is massless, it would travel at the speed of light.

So QFT proposes another mechanism for gravity. As of now, QFT and GR are incompatible, but both seem to be correct in their respective "realms." So, those are the possible mechanisms for gravity, and the correct theory of Nature will be able to reproduce both of their results.

That's as good an explanation as I can give without using Math.


EDIT:
noddarc is completely wrong.

noddarc, can your theory explain the lifetimes (I mean produce the real numbers - if you can't give me a numerical value then your theory is useless) of the neutron as well as the other Baryons, Mesons, and Leptons that we know exist through particle acceleration expriments? Just try a few: the neutron, muon, the J/Psi, and how about the Lambda-bar. Some of the conserved quantum numbers (Baryon Number, Strangeness Number, Charm Number, Spin, Electric Charge)? How about the decay modes (what they decay into). If you can explain all that, let me know. Because QFT does.

Also, since QED is so well tested, your theory needs to reproduce its prediction. It was tested to something like 9 decimal places, and it makes a prediction for the 10th (that experiment can't measure yet). Since your theory claims to explain electrons so well, you should have no problem calculating the gyromagnetic ratio for the spin of the electron in order to compare your theory to QED. (Feynman has pointed out that this accuracy is equivalent to predicting and measuring the distance between NY and LA to within the width of the human hair.)

Answer 7

it just IS.
it's one of the 4 forces known to the universe. We can describe it, but I didn't know that there was a mechanism that was understood?

Answer 8

None. Yopu have a very good opening here to contribute something

Answer 9

By nature of the question, the answer is lengthly, but it answers your question.

Magnetism and Gravity
© 2006, D. Ertle
When our world was created there had to be a common value existent between all forms of energy and mass. That common value is physical time. Magnetism and the force of gravity are representations of physical time. Their construction is that of time, but it is evidenced in different manners. The following explain how these two, apparent, different forces, relate.
These are two different kinds of force. Similar to ice and steam - these two forms of water have a direct relationship, but it is not obvious when a person considers each by itself. To bring about a comparison between magnetism and gravity, we begin by looking at the electron, then at the origin of gravitational waves and compare the two. Even though earth's magnetic field is due to planet rotation, it is still the electron that is the basis of its existence. It is the electron and its multiples that form all magnetic fields.
THE ELECTRON. This is a small bit of matter that is formed of electromagnetic energy. This is obvious, in that when a very high frequency wave of this energy enters near the nucleus of an atom it is able to form electron pairs - negative and positive electrons. In forming an electron, a monopole is made. This means an individual electron has part of the frequency of the original electromagnetic energy forming it bound in the southern half as "mass" (offers resistance to movement), and in the northern half magnetic lines form that extend outward into space - lines that in energy value are equal to the mass in the southern half. The electron, also, has an electric field form through the plane of its equator. These three parts of the electron are formed of a single, one-dimensional ray of electromagnetic energy that becomes three-dimensional when formed into mass. How the electron forms into mass is to complete a circle of more than 360 degrees and overlap part of its own frequency, thus remaining bonded to its own physical existence, all the while remaining formed into three dimensions. It is similar to a long door spring having its ends meet when formed into a circle, and then the ends pushed sideways into each other. The spring remains bonded to itself in form of a circle.
Multiples of the electron then form into neutrons and protons, which become the mass of our universe. Because mass is composed of electromagnetic energy, it has the unchangeable value of "c" inherent within. This value would be realized were an electron to be taken apart and we were able to observe what happened. What would occur is that a single, high-frequency electromagnetic wave would be released, instantly moving outward at the speed of light, “c”. The appearance of this form of energy would demonstrate that value of "c" was what composed the electron mass, as it also does all other mass.
Next, we need to consider the origin of GRAVITATIONAL WAVES. These waves are formed by a relationship between mass and energy. The equation for a gravitational field is part of the physics trilogy. E = mc2, m = E/c2, and c2 = E/m. The last is the equation for a gravitational field, or for a field of physical time - the two are the same. Notice that if there were no energy to be divisible by mass, then there could be no gravitational field. Were our planet to have no heat energy within its mass, then it would have no gravitational field. Were the energy within our planet to be increased (heat energy), then the gravitational field would increase. As the value of "E" changes so, also, does that of the gravitational field change.
The existence of gravitational waves, and a recognition that they perform work is obvious to all. In that the force of gravity does perform work, it must have an energy source. It is impossible to perform work apart from having some kind of energy present to initiate a change. What we need to know is, where the waves (a) FORM, and then why they (b) EXIST.
(a) WHERE THE WAVES FORM. The basis of gravitational waves is that of electromagnetic energy. As an individual electron, or large mass moves, there is a change in its overall frequency. The lines of frequency become more dense in direction of movement and less dense at right angles to the direction of travel. It is for this reason that a mass is able to move, and why it remains moving in its original direction and speed until some of the increase of frequency is given to another mass. If there is no manner for that frequency to be shared, then the mass must continue to move unchanged. An illustration of this force operating in your own life is found when you are in an accelerating automobile. As the automobile begins to move, you are forced back into the seat you sit in. When the acceleration ceases, you are no longer forced back in your seat. What has happened during time of acceleration is that the overall frequency of your body has had frequency density forced into it in direction of travel. This condition remains unchanged until time of breaking, at which time the kinetic energy stored in the automobile, as yourself, is transmitted to the breaking system as heat energy. In like manner, gravitational waves form within individual electrons that release resistance (heat energy = hf) as gravitons, similiar to the breaking system of your automobile releasing kinetic energy through its breaking system.
But, what happens to a mass that exists within the core of our planet when it is unable to move, yet it has a great deal of energy within in form of heat? The mass is three-dimensional, occupying space, but there is no observable evidence of frequency change within, as with a similar mass in outer space. This brings us to:
(b) WHY GRAVITATIONAL WAVES EXIST and how to relate their existence to the mass where they originate. It is often stated that were a mass to approach the speed of light, it would become much shorter in the direction of movement. That statement is true. Because mass has as its basis electromagnetic energy, it must act in the same manner as the energy that comprises it. The thought in short form is as follows:
E = hf, electromagnetic energy is equal to its frequency times Plank's constant.
mk = hf, mass kinetic energy, operates exactly the same way as does electromagnetic energy. When there is an increase of energy in one direction, the overall line density in that direction increases, thus the length decreases. The energy values at right angles to direction of travel become less in proportion to that of the forward one. Mass does not gain mass as it moves, it transfers energy (hf) from right angle dimensions to the dimension of travel.
c = hf, is a very small energy value. It may be that of the value of "h" by itself. If this is so, then the c(g) (constant gravity) = hf would read as c(g) = h. The reason for c(g) = h would be that the value of "c" would be non-divisible, and would always remain the same frequency value under all circumstances. The value c(g) = h appears to be the basis of all mass and energy values in our universe. It is the singular, small wave of existence that defines reality. But, there is another manner whereby the graviton may form and exist as an entity unable to be altered in any manner as it moves through space. That is, if the speed of this wave becomes either slightly greater, or slightly less, than that of the value of "c" when it is formed. If this were to happen, the graviton would move into the past at a slightly different time value than the rest of our universe, thus it would a have physical time value slightly different than "c" and would not completely relate to E = mc2 or m = E/c2. Notice that if the c2 value of either of these equations is off fractionally, then neither energy nor mass formed of such value could wholly exist in our world.

From the above, we are now able to compare two different moving masses, in two different locations, doing the same thing but in different manners.
First, is that of a mass in a speeding spaceship. The mass will be moving at the speed of light minus 25 mps (miles per second). At this speed the mass will be to a nearby observer, who is standing at a right angle to it, as though it is a very thin line in space. The forward dimension will have become very compressed according to mk = hf. The obvious energy nature of this object, to the viewer, would be that of kinetic energy. Any energy movement at right angles to direction of travel in this mass is at most 25 mps, whereas when the mass is at rest it would be 186,000 mps in all directions. It is for this reason we understand that energy, in form of frequency (hf), is being converted from right angles to that of direction of travel. Mass has not gained mass due to movement in form of energy - it has converted its own energy/mass by means of frequency change.
Second, let’s take a look at a mass within our planet that is 0.717 miles outward from its core point. The nature of a mass in this location, were it to be able to freely fall, is that it would instantly be moving toward the center of our planet at the same speed as the mass in outer space - moving at the speed of light minus 25 mps. BUT the mass within our planet would not, in appearance, be going any place, point to point. This mass, forced to remain in the same location of 0.717 miles from the center of our planet through all time, would according to appearance, be doing nothing and going nowhere.
What is the comparison between the two masses so that we may determine how gravitational waves form, and then understand their relation to magnetic lines?
Were you to take the mass in outer space, and were it exactly the same size as the one within the core area of our planet, and were you to exchange them, it could be done with no problem. The one presently in the core of earth would immediately be accelerating at the speed of light minus 25 mps when placed in outer space. Then the one that had been zipping along in outer space could be fitted into the core of earth, where the other had been, and there would be no disruption. Why is that possible?
The moving mass in outer space has obvious kinetic energy within. The one in the center of our planet has the same energy value but it remains unseen. Both have the same value of "mk = hf" within. When either mass was free to move in outer space, the mass moved according to the "visual value of kinetic energy" which [CHANGES MASS LOCATION IN TIME] (mk = hf). Then there is the mass 0.717 miles from the center of our planet. This earth mass changes physical time according to "mass plus heat energy contained within it." This condition of mass [CHANGES TIME IN MASS LOCATION or c2 = E/m] (still, mk = hf). Heat energy is actually kinetic energy, just as much as is found in the moving mass in outer space. This type of kinetic of energy, though, is random in direction, and short in distance movement. The "random action" of individual atoms decreases as the mass frequency aligns in a particular direction. The resistance of kinetic-heat energy in the direction of travel, due to an increase of mass density in a particular direction, is what releases gravitons. There are "less to no" gravitons formed in directions at right angles to that of travel, due to both the existence of mass and energy being less at right angles.
The frequency of E/m (gravitational waves) escapes at the speed of light. If the frequency (hf) of the earth mass at the 0.717 mile location decreases its energy value (heat energy), its relative mass speed would also change, and a person could no longer directly exchange it with the one in outer space. As long as the heat energy continues to exist so, also, shall the propagation of gravitational waves exist, all the while the mass that forms them appears to be moving nowhere.

Now, what is the direct relationship between gravity and magnetic waves. To understand this we are going to consider a magnet that is moving through space. The magnet shall be moving in the direction of its north pole. We shall consider this magnet moving at the speed of light, minus 25 mps, the same as the previous mass in outer space. The question is, "What is happening to the magnetic field of this high-speed magnet?" The mass and magnetic field within an individual electron balance. They are part of the same wave, but evidenced in different manners. As the mass increases (hf), so also do the magnetic lines increase in strength. So, the moving magnet would have a very, very strong field in direction of travel and a proportional decrease of line extension at right angles to direction of travel. The magnetic lines would cease to extend outside the diameter of the mass. Gravitons and magnetic waves are both subject to the energy of motion, and both intensify in direction of motion under proper conditions. Both are subject to "hf".

Duane Ertle
South Haven, Michigan