# The Post-modern Modification of the Weak Equivalence Principle

Since classical physics, we have adopted the basic understanding of the weak equivalence principle as the equality of gravitational mass and inertial mass. But now, post-modern revises this our basic understanding of the weak equivalence principle as one of its very necessary and revolutionary implications which will be discussed in this article.

So, this scientific article is very important because it primarily addresses how post-modern physics has modified the weak equivalence principle. But besides this, I have also decided to write this article because of a good concern for physics that has come to my awareness just recently.

*What is this good concern?*

This good concern is about the different kinds of mass in physics which I think is not appropriate in our very simple universe. It appears that there are five kinds of mass which are: *rest mass, gravitational mass, inertial mass, relativistic mass, and invariant mass.*

Now, besides what I am going to say on a scientific basis about all of this, it is my intuitive conviction that the universe cannot apply mass in this way. It is like looking at a piece of chalk and saying that it has five kinds of mass. This is nothing short of confusion.

We cannot just pop out of our minds different kinds of mass; mass is a very special and fundamental quantity! I have been aware of the first four kinds of mass stated but the last one, which is invariant mass, has just come to my notice recently.

Let me briefly describe the different kinds of mass already stated:

**1. Rest Mass:** It is the kind of mass that a body at rest possesses relative to an observer. It is a constant and unchanging kind of mass.

**2. Gravitational Mass:** It is the kind of mass that is involved in gravitational interactions according to Newton’s inverse square law. It is what is found in the expression for force, F=m_{g}g and it is an unchanging kind of mass just like rest mass.

**3. Inertial Mass:** It is the kind of mass that is involved in non-gravitational accelerations and that is inserted into the famous force equation F=m_{i}a.

**4. Relativistic Mass:** It is the kind of mass that bodies possess or exhibit when they move closer to the speed of light. It was one of the popular predictions of special relativity.

**5. Invariant Mass:** It is a concept of mass that stands in-between rest mass and relativistic mass. It is the kind of mass that bodies possess when they move not too close to the speed of light…

We will get to talk about how post-modern physics sees these different kinds of mass, but before then, let us discuss the modification of the weak equivalence principle according to post-modern physics.

Before now, I was totally convinced that post-modern physics modifies the strong equivalence principle without doing the same for the weak equivalence principle. But this was a very hurried conclusion, and now I am seeing that post-modern physics modifies the weak equivalence principle in the same manner that it modifies the strong equivalence principle.

This is why I have decided to write this scientific article which is the exact follow-up of one of my previous articles on the post-modern modification of the strong equivalence principle. But in this article, I will be bringing both modifications together to give us a complete understanding of the universal equivalence principle and the current situation in physics.

Furthermore, my new understanding of the modification of the weak equivalence principle has come as a result of my deeper understanding of the universal equivalence principle and the implications of the new law of universal acceleration which seems to occupy most of my recent thoughts about the universe.

This law for quite some time now has forced me to begin to contemplate again the implications of the inverse square law for physics and in this venture, I realized that the weak equivalence principle has also undergone a post-modern modification.

And one must understand that these post-modern modifications of the weak and the strong equivalence principle were very necessary in order for me to arrive at the universal equivalence principle. Our former understanding of the weak and the strong equivalence principles could not produce the vision of their synthesis as the universal equivalence principle.

This is why the revision of the understanding of these principles was necessary, and looking back, I am increasingly becoming aware of how the universal equivalence principle was as a result of this revision, some of which were inadvertently done.

I say that the revision of the weak and the strong equivalence principle was inadvertently done because during the process I was not very conscious about the post-modern nature of the universal equivalence principle and how this post-modern nature is as a result of the modification of the weak and the strong equivalence principles.

But now, as I blog about post-modern physics, I have become increasingly aware of the revision of the weak and the strong equivalence principles and how this revision serves as the cause of the universal equivalence principle. In other words, I am understanding the universal equivalence principle better.

Now, in my previous article on the post-modern modification of the strong equivalence principle, I made it clear that in post-modern physics, the strong equivalence principle is what states that rest gravity and acceleration are equal or indistinguishable.

But before, in modern physics, the strong equivalence principle was what stated that gravitation and acceleration are equal or indistinguishable. It is easy to see that while acceleration is maintained in both the modern and the post-modern statements of the strong equivalence principle, gravitation is not maintained as it has become replaced by rest gravity (or *rest gravitation* or even *rest acceleration,* as the case may be).

Now, something very corresponding is what has happened to the weak equivalence principle which according to classical physics states that gravitational mass and inertial mass are equal.

But according to post-modern physics, the weak equivalence principle is what states that rest mass and inertial mass are equal or indistinguishable. It is also easy to see that while inertial mass is maintained in both the classical and the post-modern statements of the weak equivalence principle, gravitational mass is not maintained as it has become replaced by rest mass.

So, for the weak equivalence principle, gravitational mass has become replaced by rest mass, while for the strong equivalence principle, gravitation has become replaced by rest gravity or rest gravitation. We are looking at how for both principles, post-modern physics has replaced gravity and its associated quantities with rest gravity and its associated quantities.

The further implication of this is that gravitational mass does not exist in the universe even though this cannot be said of gravity which has taken a greater meaning in post-modern physics. This greater meaning of gravity is that it is an acceleration limit in the universe.

With this understanding, gravity is no longer a sub-component or reference of either the weak or the strong equivalence principles, rather it has ascended as the principal cause of the universal equivalence principle.

This new understanding is important so that you can see why the revision of the weak and the strong equivalence principle was necessary. We had to revise these two principles to arrive at the universal equivalence principle because of the new and superseding understanding of gravity (as the acceleration limit of the universe) that we now have.

Now, the mathematical equality which the universal equivalence principle reveals is that rest mass and rest gravity are related by the inverse square law and this is the same for the relationship between inertial mass and acceleration.

Thus, the universal equivalence principle is a profound principle that reveals to us how the weak equivalence principle and the strong equivalence principle are related by the inverse square law. In post-modern physics, the inverse square law is what defines the relationship between the weak and the strong equivalence principles.

Now, concerning the non-existence of gravitational mass which has become replaced by rest mass in the weak equivalence principle, I am aware that this kind of mass has been known since classical physics and I am aware of how this affects our fundamental understanding of physics.

But what we are seeing now in post-modern physics is that gravitational mass does not exist and not just this kind of mass but also the other two kinds of mass: *relativistic mass* and *invariant mass*.

In addition, I do not consider it possible that the universe will permit any other kind of mass outside what the weak equivalence principle permits and relates. The weak equivalence principle is what relates the only two fundamental kinds of mass in the universe which are *rest mass* and *inertial mass*.

Also, I have discussed in this scientific article why relativistic mass does not exist and what does. And I also take that whatsoever disproves the existence of relativistic mass also disproves the existence of invariant mass.

We cannot continue to uphold the concept of gravitational mass. What we should now uphold is the concept of rest mass. We now have only rest mass for the *rest interaction* of bodies and inertial mass for the *inertial interaction* of bodies.

Furthermore, we must know that in post-modern physics every reference or discussion of gravitational phenomena is only an approximation, for the real field in question is the gravi-electromagnetic field. The free fall of bodies which we attribute to gravity is not actually due to gravity in a complete sense, but it is due to the gravi-electromagnetic wave.

This wave, as I have repeatedly taught us in this blog, is the second non-mechanical wave in the universe after light. This wave is what actually communicates the effects we attribute to gravity.

This is why in post-modern physics when we really want to discuss some of the mysteries of physics especially those that are concerned with gravity, we delve into gravi-electromagnetism.

What we have misunderstood so far about gravity is that it only acts as a component of the gravi-electromagne wave. This is why some of the phenomena associated with gravity puzzled physicists, especially its instantaneous action across the universe.

The obvious instantaneous action of gravity is not due to gravity per se, rather it is due to the gravi-electromagnetic wave of which gravity acts as one of its components. So, we should really be talking about the instantaneous action of the gravi-electromagnetic wave and not of gravity.

Now, *if free fall is really due to the gravi-electromagnetic wave and not gravity, what then can we make of gravitational mass? Shouldn’t we be actually talking of gravi-electromagnetic mass?*

While the above shouldn’t be the case, it helps us understand the situation. And in a very fundamental understanding according to post-modern physics, every mass in the universe is attributed to the gravi-electromagnetic wave; it is the actual content and cause of matter in the universe.

It is important to also see that the attribution of free fall to the gravi-electromagnetic wave and not to gravity is what leads to the new fact that all accelerations in the universe are inertial and not gravitational.

We have lost the classical meaning of gravitational acceleration in physics; it no longer exists alongside gravitational mass. What we now simply have are rest and inertial acceleration and they are what respectively lead to the concepts of *rest interaction* and *inertial interaction*.

Basically, the concept of rest interaction refers to how bodies by their rest masses interact according to the inverse square law while inertial interaction refers to how bodies by their inertial masses interact according to the inverse square law. (I think that I may have to discuss these two concepts in another scientific post.

The new concepts of *rest interaction* and *inertial interaction* are due to the universal equivalence principle and they are shown in the diagram below:

– *Rest gravity is what is represented as g _{r}*

*in the figure above.*

Now, from the concept of rest interaction, one sees that the post-modern concept of rest does not refer to complete inertness, rather it also incorporates an interaction according to the inverse square law. It is because of this that we can see how the weak equivalence principle still relates two active masses: rest mass and inertial mass.

This is just as it formerly related gravitational mass with inertial mass both of which we saw as active masses. For just as gravitational mass was what brought bodies to interact according to the inverse square law so also does rest mass bring bodies to interact according to the inverse square law — rest mass is also a kind of active mass in post-modern physics.

This new activity of rest mass is what introduces us to the concept of *rest force* in post-modern physics and a whole lot of other new concepts.

It is important to know that both rest mass and inertial mass are now applied in the inverse square law. So, rest mass now applies in the inverse square law and it is related to a special quantity referred to as rest gravity.

What we call rest gravity in post-modern physics is the special quantity by which gravity accelerates greater than any accelerating body under investigation.

In other words, we are made to understand immediately that the existence of rest mass in the universe is a simple result of the fact that no accelerating body can accelerate greater than gravity.

From our discussions so far, you can deduce that we now have a new understanding of gravity in post-modern physics and this new understanding among others is what is changing our classical understanding of rest mass and inertial mass and thus of the weak equivalence principle.

So in post-modern physics, we are drawn to a new understanding of the weak equivalence principle which asserts the equality of rest mass and inertial mass, and this simple, well-divided understanding informs us that rest mass is what is involved in all forms of rest in the universe while inertial mass is what is involved in all forms of acceleration in the universe.

We now see that the universal equivalence principle has come with a revision of our former understanding of the weak and the strong equivalence principles such that for the weak equivalence principle, gravitational mass has become replaced by rest mass, while for the strong equivalence principle, gravitation has become replaced by rest gravitation.

Thus, it is one of the final conclusions of post-modern physics that gravitational mass and any other kind of mass besides rest mass and inertial mass do not exist. We have only two kinds of mass in the universe, rest mass and inertial mass, and their existence and relationship with each other is as defined by *the post-modern weak equivalence principle*.

Until next time,

I will be here.

– M. V. Echa

* – An importantly related scientific article:*