Hello webo,
webolife wrote:Chan,
I'm a bit confused by your previous post...
In one place you say that space and time are both fundamental physical entities. Yet, a vector has much more specificity about how the space/field is behaving. And I would say that time is also a vectoral agent, in that periodicity is always returning an entity to its [relative] original position, and apt describer of centropy as well.
How can space be a fundamental entity, but the vectoral behavior of space not be? I appreciate that there are material entities, and also believe that there are non-material entities, as well as mental constructs or models of reality which are themselves not the same as physical material reality. Are you saying that the non-material entities of space and time are in fact physical? Are they phenomenal, ie. agents of change in nature?
Clarify for me if you would, please.
I think when we talk about physics, it will always have an element of the metaphysical as well. I do remember that physicists would sometimes ask fundamental questions like what is reality or about if time has physicality, etc. Very often, words that have their everyday meaning are also used in physics; in such cases we may have to be clear how the words may have meaning more specific than as used in the everyday sense. Some examples that would give rise to a lot of arguments would be words as "reality", "physical" and its compound "physical reality".
We ask our early ancestors whether distance, height has "physical reality". Of course! If you tell them to jump off a high cliff and that they could flap their arms and fly like the birds, they would refuse - "reality" from experience is the mother of all teaching! So space has physical reality. But sometimes, there is a preference to restrict the use of reality to tangible material things - differentiating material and non-material. But I prefer to use as criterion for physical reality the human faculties - the mind as well as the physical senses. With this criterion, the human has an awareness of space. I would also consider time to have physical reality - time is a comparison of general motions to some standard motion as the swing of a pendulum.
Now about whether fields and vectors in physics have physical reality. I would consider the examples of vector space and affine space; they are related but different mathematical structures sometimes used to represent the space of the universe. But mathematics is just a language; it is the physical universe that a language tries to describe - the language itself does not have physical reality. In this sense, I would say the field theory approach in physics is just a mathematical approach and the field itself is only a concept - it is only the universe that we attempt to describe that has physical reality.
Take another concept - force. Does force have physical reality? The concept of force as understood by our early ancestors certainly is real. But now, we are into a rather academic treatment of force in physics: force = mass x acceleration with dimension [M][L]/[T²]. The physical underpinnings of force is again space, time and mass. I prefer to view force as a physical concept. It is only through association with everyday experience that we say force has physical reality.
One more thing that escaped me in my earlier post, a very interesting and controversial assertion -
light has no physical reality! Let's first examine sound. Sound, or sound wave, does not have physical reality. If we take sound as what our ears can detect, then sound outside of our hearing range would be considered as not real - which is a contradiction. We now know that sound is a wave in a fluid - a transmission of energy of vibration of the particles constituting the fluid. The wave itself is mathematical; what is the real underpinning of sound is physical matter - sound and kinetic energy are only manifestations of matter in nature.
Now back to light. Our current view of light as a wave has light to be waves of the E and B fields. If I follow through the criterion that fields have no physical reality, then all mathematical waves have no physical reality. Then, what is the physical reality underpinning light; there is a strong need to treat light as "something" rather than just "nothing". The reality is the aether.
It is the aether that has physical reality; light is only a physical manifestation of the aether. But the aether is not recognized by mainstream physics; nor do we know much of this physical aether.
So now, I would like to treat as fundamental physical reality to consists of space, time, mass, charge and the aether.
Best regards,
Chan Rasjid.