How Quantum Field Theory Solves the "Measurement Problem".

It is not generally understood that Quantum Field Theory gives an easy solution to the "measurement problem" that was examined on the September letters page of Physics Today. But by QFT I do not mean Feynman's particle-based theory; I mean Schwinger's QFT where "there are no particles, there are only fields".1.

The fields are present in the form of quanta, i.e., chunks or units of field, as Planck envisioned over a century ago. Field quanta evolve in a deterministic way specified by the field equations of QFT, except when a quantum suddenly deposits some or all of its energy or momentum into an absorbing atom. This is called "quantum collapse" and it is not defined by the field equations. In fact there is no theory that describes it. Everything we understand is that the probability of it happening depends upon the field strength at a given position. Or, if it is an interior collapse, like a shift in angular momentum, the likelihood depends on the element of angular momentum in the given direction. In QFT this collapse is a physical event, not a mere change in probabilities as in Quantum Mechanics.

Many physicists are troubled by the non-locality of quantum collapse where a spread-out field (or perhaps 2 correlated quanta) unexpectedly disappears or changes its interior condition. Yet non-locality is required if quanta are to serve as a unit, and it has been experimentally proven. It does not result in inconsistencies or paradoxes. It might not be just what we anticipated, but just as we accepted that the world is round, that the planet orbits the sun, that matter is built from atoms, we ought to be able to acknowledge that quanta can collapse.

Sometimes quantum collapse can cause a macroscopic change or "measurement". However the measurement outcome, i.e., the "decision", was determined at the quantum level. Everything after the collapse follows inevitably. There is no "superposition" or "environment-driven process of decoherence.".

Take Schrödinger's cat as an illustration. If a radiated quantum collapses and transfers its energy into 1 or more atoms of the Geiger counter, that initiates a Townsend discharge that leads inexorably to the demise of the cat. In Schrödinger's words, "the counter tube discharges and through a relay releases a hammer which smashes a little flask of hydrocyanic acid" and the cat dies. Alternatively, if it does not collapse in the Geiger counter then the cat lives.

Of course we don't know the result until we look, but we certainly never know anything until we look, no matter if it's throwing dice or choosing a sock blindfolded. The fate of the cat was actually determined at the moment of quantum collapse, just like the outcome of throwing dice is identified when they hit the table and the color of the sock is figured out when it is taken out of the drawer. After the quantum collapse there is no entanglement, no superposition, no decoherence, only lack of knowledge. What could be easier?

In addition to offering an easy solution to the measurement problem, Quantum Field Theory provides a logical explanation for the paradoxes of Relativity (Lorentz contraction, time dilation, etc.) and Quantum Mechanics (wave-particle duality, etc.). It is regrettable that so few physicists have acknowledged QFT in the Schwinger sense.

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The Uncertainty Principle

The probabilistic analysis of Schrödinger's equation at some point resulted in the uncertainty principle of Quantum Mechanics, formulated in 1926 by Werner Heisenberg. This principle says that an electron, or any other particle, can not have its precise position known, or even specified. More exactly, Heisenberg formulated a formula that connects the uncertainty in location of a particle to the uncertainty of its momentum. So not only do we have wave-particle duality to deal with, we need to take care of particles that may be here or may be there, but we just can't say where. If the electron is truly a particle, then it only stands to reason that it should be someplace.

Resolution. In Quantum Field Theory there are no particles (stop me if you have indeed heard this before) and thus no location-- certain or uncertain. Alternatively there are blobs of field that are spread over space. As opposed to a particle that is either here or here or perhaps there, we have a field that is here and here and there. Spreading out is a thing that only a field can do; a particle can not do this. Actually Heisenberg's Uncertainty Principle is not very different from Fourier's Theorem (found in 1807) that relates the spatial spread of any wave to the spread of its wave length.

This does not suggest that there is no uncertainty in Quantum Field Theory. There is uncertainty in regard to field collapse, but field collapse is not explained by the formulas of QFT; Quantum Field Theory can just forecast possibilities of when it happens. Nevertheless there is a significant difference between field collapse in QFT and the corresponding wave-function collapse in QM. The former is an actual physical change in the fields; the latter is just a change in our understanding of where the particle is...

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Scientific American, EINSTEIN DIDN'T SAY THAT!

In the September "Einstein" issue of Scientific American, audiences are given the impression that gravity is caused by curvature of space-time. For instance, on the 1st page of that segment, we read "gravity ... is the by-product of a curving universe", on p. 43 we discover that "the Einstein tensor G describes how the geometry of space-time is warped and curved by massive objects", and on p. 56 there is a reference to "Albert Einstein's explanation of how gravity emerges from the bending of space and time".

In reality, many physicist today emphasize "curvature" as the definition for gravity. As Stephen Hawking penned in A Brief History of Time, "Einstein made the revolutionary suggestion that gravity is not a force like other forces, but is a consequence of the fact that space-time is not flat, as had been previously assumed: it is curved, or warped.".

The issue is, that's NOT what Einstein said. Einstein made it rather clear that gravity is a force like other forces, along with (obviously) specific distinctions. In the actual paper cited by Scientific American ("The foundation of the general theory of relativity", 1916) he wrote," [there is] a field of force, namely the gravitational field, which possesses the remarkable property of imparting the same acceleration to all bodies". The G tensor, said Einstein "describes the gravitational field." The term "gravitational field" or just "field" occurs 58 times in this article, while the word "curvature" doesn't turn up at all (except in relation to "curvature of a ray of light"). And Einstein is not the only physicist who believes that. For example Sean Carroll, a prominent physicist of today, wrote:.

Einstein's general relativity describes gravity in terms of a field that is defined at every point in space ... The world is really made out of fields ... deep down it's really fields ... The fields themselves aren't "made of" anything-- fields are what the world is made of ... Einstein's ... "metric tensor"... can be thought of as a collection of ten independent numbers at every point.-- Sean Carroll.

To suppress the field concept and emphasize "curvature" not only misstates Einstein's perspective; it likewise offers folks a false or deceptive understanding of basic relativity.

So where does "curvature" originated from? According to Einstein (in the cited paper), the gravitational field causes physical adjustments in the length of measuring rods (just like temperature can cause such changes) and it is these changes that produce a non-Euclidean metric of space. Actually, as Einstein indicated, these changes can take place even in a space which is without gravitational fields-- i.e., a rotating system. He then showed that this non-Euclidean geometry is mathematically equal to the geometry on a curved surface, which had been developed by Gauss and extended (mathematically) to any number of dimensions by Riemann. That this is a mathematical equivalence is clearly stated by Einstein in a later paper: "mathematicians long ago solved the formal problems to which we are led by the general postulate of relativity".

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When Do Fields Collapse?

A notable question in physics now concerns collapse of the "wave-function": When does it occur? There have been many speculations (see, e.g., Ghirardi-- Rimini-- Weber theory, Penrose Interpretation, Physics forum) and experiments (e.g., "Towards quantum superposition of a mirror") about this. The most extreme viewpoint is the belief that Schrödinger's cat is at the same time alive and dead, although Schrödinger proposed this particular thought-experiment (like Einstein's less-well-known bomb experiment) to demonstrate how silly this type of an idea is.

The concern arises because Quantum Mechanics can only calculate probabilities until an observation happens. But Quantum Field Theory, which deals in real field intensities-- not probabilities, delivers a practical indisputable answer. Unfortunately, Quantum Field Theory in its authentic sense of "there are no particles, there are only fields" (Art Hobson, Am. J. Phys. 81, 2013) is ignored or misinterpreted by a large number of physicists. In QFT the "state" of a system is illustrated by the field intensities (technically, their expectation value) at every point. These fields are real properties of space that behave deterministically depending on the field equations-- with one exception.

The exception is field collapse, but in Quantum Field Theory this is an incredibly different thing from "collapse of the wave function" in QM. It is a physical event, not a change in chances. It occurs when a quantum of field, regardless of how spread-out it may be, suddenly deposits its energy into a single atom and vanishes. (There are also other kinds of collapse, such as scattering, coupled collapse, internal change, and so on) Field collapse is not explained by the field equations-- it is an independent event, but just because we don't possess a theory for it doesn't imply it can not take place. The fact that it is non-local bothers some physicists, but this non-locality has been demonstrated in many experiments, and it does not result in any disparities or paradoxes.

So once field collapse happens, the ultimate "decision"-- the climax-- is reached. This is QFT's answer to when does collapse occur: when a quantum of field colapses. In the case of Schrödinger's cat, this is when the radiated quantum (perhaps an electron) is grabbed by an atom in the Geiger counter.

Right before a field quantum finally collapses, it may have interacted or entangled with numerous other atoms along the way. These interactions are described (deterministically) by the field equations. However the quantum can not have indeed collapsed into any of those atoms, because collapse can transpire only once, so whatever you refer to it as-- interaction, entanglement, perturbation, or just "diddling"-- these initial interactions are undoable and do not bring about macroscopic changes. Then, when the last collapse takes place, those atoms become "undiddled" and return to their undisturbed state.

To sum up, in QFT the "decision" is developed when a quantum of field deposits all its energy into an absorbing atom. In addition to replying to this inquiry, QFT additionally explains why time dilates in Special Relativity and settles the wave-particle duality issue of Quantum Mechanics. One can simply wonder the reason that this particular concept hasn't already been embraced and made the grounds for our awareness of nature. I think it is truly time for physicists to WAKE UP AND SMELL THE QUANTUM FIELDS.
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Book Clarifies Confusing Quantum Field Theory

The following is a current article written about Quantum Field Theory and the book, Fields of Color. The write-up appeared in the Leisure World News on September 4, 2015.

The publication "Fields of Color: The Theory that Escaped Einstein" clarifies the perplexing Quantum Field Theory in order that a layman can understand it. Written by Leisure World resident Rodney Brooks, it features no equations-- in fact, no math-- and it makes use of colors to represent fields, which in themselves are difficult to picture. It demonstrates the field picture of nature resolves the paradoxes of quantum mechanics and relativity that have puzzled so many people. It is original, comprehensive, and entertaining.

Brooks is blown away and pleased with the success of his book, which was released in 2011. He says 6,000 copies have been sold, rare for a self-published book on physics. On top of that, the publication has a 4.4 (out of 5) star rating on Amazon along with greater than 90 reader reviews-- a higher score than Einstein's own book on relativity and above Stephen Hawking's popular book "The Theory of Everything.".

In its essence, quantum field theory (QFT) illustrates a world comprised of fields, not particles (neutrons, electrons, protons) as most physicists believe. Nevertheless the field principle is difficult to grasp. To quote from Chapter 1 of "Fields of Color": "To put it briefly, a field is a property or a condition of space. The field concept was introduced into physics in 1845 by Michael Faraday as an explanation for electric and magnetic forces. However, the idea that fields can exist by themselves as "properties of space" was too much for physicists of the time to accept." (Chapter 1 in its entirety can be read at http://www.quantum-field-theory.net/).

Colors of Fields.
Later on this principle was expanded to other fields. "In Quantum Field Theory the entire fabric of the cosmos is made of fields, and I use (arbitrary) colors to help people visualize them," says Brooks. "If you can picture the sky as blue, you can picture the fields that exist in space. Besides the EM (electromagnetic) field ('green'), there are the strong force field ('purple') that holds protons and neutrons together in the atomic nucleus and the weak force field ('brown') that is responsible for radioactive decay. Gravity is also a field ('blue'), and not 'curvature of space-time' which most people, including me, have trouble visualizing.".

He carries on: "In QFT, space is the same old three-dimensional space that we intuitively believe in, and time is the time that we intuitively believe in. Even matter is made of fields-- in fact two fields. I use yellow for light particles like the electron and red for heavy particles,.

like the proton. But make no mistake, in QFT these 'particles' are not little balls; they are spread-out chunks of field, called quanta. Thus the usual picture of the atom with electrons traveling around the nucleus like little balls, is replaced by a 'yellowness' of the space around the nucleus that represents the electron field.".

Brooks' interest in physics was first kindled when at age 14 he read Arthur Eddington's "The Nature of the Physical World." This publication describes how a table is made of little atoms that consequently can be divided into even tinier objects. "So this is what the world is built of," Brooks thought back then. In college at the University of Florida he majored in math with a minor in physics. He was then drafted into the army for two years.

Quantum Field Theory Answers Problem.
Fast forward to graduate school at Harvard University where Brooks was a National Science Foundation scholar, majoring in physics. During the course of this time, he enrolled in a three-year formal lecture series instructed by Julian Schwinger. The Nobel prize-winning physicist had just completed his reformulation of QFT, so the timing was perfect. "I was surprised that all the paradoxes of relativity and quantum mechanics that had previously perplexed me evaporated or were resolved," Brooks says.

After acquiring his Ph.D. at Harvard under Nobel laureate Norman Ramsey, Brooks worked for 25 years at the National Institutes of Health in Bethesda, Md., in neuroimaging. His first research study was regarding the brand new procedure of Computered Tomography (CT), during which time he devised the approach now known as dual-energy CT. Later, he did research on Positron Emission Tomography (PET) and ultimately in Magnetic Resonance Imaging (MRI). All in all, Brooks published 124 peer-reviewed articles.

Once he retired, he and his wife, Karen Brooks, relocated to New Zealand in 2001. That was when he became aware of the prevalent confusion about physics, specifically quantum mechanics and relativity, whilst his cherished QFT that fixes the confusion was disregarded, misunderstood, or neglected.

"Consequently I undertook the mission of illustrating the concepts of quantum field theory to the public," Brooks says.

His book was initially published in New Zealand in 2010, and is presently in its second edition.

In 2012, his grandchildren, who reside in Maryland called out, and he and his wife relocated to Leisure World, where he moves ahead to work on his purpose. Whilst Einstein ultimately came to think that reality must contain fields and fields alone, he preferred there to be a solitary "unified" field that would not merely consist of gravity and electromagnetic forces (the only two forces recognized back then), but would additionally contain matter.

He invested the last 25 years of his life unsuccessfully looking for this unified field theory.

Referring to the particle picture that he espoused, physicist Richard Feynman once said, "The theory ... describes Nature as absurd from the point of view of common sense. And it agrees fully with experiment. So I hope you can accept Nature as She is-- absurd.".

Brooks, alternatively, concludes his initial chapter by saying, "I hope you can accept Nature as She is: beautiful, consistent and in accord with common sense-- and made of quantized fields.".

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Space-Time Curvature & Quantum Field Theory

General Relativity is the name provided for Einstein's theory of gravity that was defined in Chapter 2 of my book. As the idea is usually shown, it explains gravity as a curvature in four-dimensional space-time. Now it is a concept far over and above the reach of common people. Just the concept of four-dimensional space-time causes the majority of us to shudder ... The answer in Quantum Field Theory is easy: Space is space and time is time, and there is no curvature. In QFT gravity is a quantum field in ordinary three-dimensional space, just like the other 3 force fields (EM, strong and weak).

This does not actually suggest that four-dimensional notation is not useful. It is a convenient way of handling the mathematical connection between space and time which is needed by special relativity. One could almost say that physicists couldn't live without having it. Still, spatial and temporal evolution are fundamentally different, and I say shame on people who aim to foist and push the four-dimensional concept onto the general public as vital to the understanding of theory of relativity.

The idea of space-time curvature likewise had its origin in mathematics. When seeking a mathematical approach that could embody his Principle of Equivalence, Einstein was led to the formulas of Riemannian geometry. And indeed, these formulas define four-dimensional curvature, for individuals who are able to imagine it. You see, mathematicians are not confined by physical constraints; equations that have a physical definition in 3 dimensions can possibly be generalized algebraically to any variety of dimensions. But when you do this, you are truly handling algebra (equations), not geometry (spatial configurations).

By expanding our minds, several of us are able to even make a faint mental image of what four-dimensional curvature might be like if it did exist. Nevertheless, claiming that the gravitational field equations are equal to curvature is definitely not the same as stating that there is curvature. In Quantum Field Theory, the gravitational field is just another force field, like the EM, strong and weak fields, though with a higher complication which is demonstrated in its higher spin value of 2.

While QFT resolves these paradoxical declarations, I really don't wish to leave you having the thought that the theory of quantum gravity is problem-free. While computational issues concerning the EM field were overcome with process referred to as renormalization, comparable challenges involving the quantum gravitational field have not been conquered. Fortunately they do not interfere with macroscopic computations, for which the QFT formulas become the same to Einstein's.

Your choice. Once again you the reader have an option, as you did in concern to the two methods to special relativity. The option is not about the formulas, it has to do with their perception. Einstein's equations can be deciphered as suggesting a curvature of space-time, unpicturable as it may be, or as detailing a quantum field in three-dimensional space, just like the other quantum force fields. To the physicist, it actually doesn't make much difference. Physicists are far more concerned with solving their formulas rather than with analyzing them. If you will permit me another Weinberg quote:

The important thing is to be able to make predictions about images on the astronomers photographic plates, frequencies of spectral lines, and so on, and it simply doesn't matter whether we ascribe these predictions to the physical effects of gravitational fields on the motion of planets and photons or to a curvature of space and time. (The reader should be warned that these views are heterodox and would meet with objections from many general relativists.)-- Steven Weinberg

Therefore in case you prefer, you can believe that gravitational effects are due to a curvature of space-time (despite the fact that you can't visualize it). Or, like Weinberg (and me), you can view gravity as a force field that, similar to the other force fields in Quantum Field Theory, exists in three-dimensional space and progresses in time according to the field equations.

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Why is the Speed of Light Constant?

The query "The reason is the speed of light constant?" is typically asked about by individuals attempting to learn physics. Google has 2760 links to that question. However the answer is so easy that a 10-year-old can understand it, that is, if you accept Quantum Field Theory.

Bring the ten-year-old to a lake and drop a rock in the water. Show her that the waves move through the water at a specific velocity, and tell her that this velocity depends solely on the properties of water. You may drop different items at different areas and show her that the waves go at the exact same rate, no matter the size of the object or location of the water.

Then tell her that sound travels through air with a fixed velocity that depends solely on the properties of air. You might wait for a thunderstorm and time the difference in between the lightning and the noise. Inform her that a whisper moves as fast as a scream. I believe a ten-year-old can perceive the concept that water and air have properties that establish the velocity of these waves, even if she does not understand the equations.

Any person who can understand this can then comprehend why the speed of light is constant. You see, in Quantum Field Theory space has properties, exactly as air and water have properties. These properties are known as fields.

As Nobel laureate Frank Wilczek wrote, "One of the most basic results of special relativity, that the speed of light is a limiting velocity for the propagation of any physical influence, makes the field concept almost inevitable.".

When you recognize the concept of fields (which of course is certainly not an easy one), that is really all you have to understand. Light is waves in the electromagnetic field that travel through space (not space-time) at a velocity governed by the properties of space. They abide by fairly basic formulas (not that you have to recognize them), just like sound and water waves follow basic formulas. OK, the Quantum Field Theory equations are a little bit more intricate, but quoting Wilczek again, "The move from a particle description to a field description will be especially fruitful if the fields obey simple equations ... Evidently, Nature has taken the opportunity to keep things relatively simple by using fields.".

Even so this inquiry can have a different meaning: "Why is the speed of light independent of motion?" This fact was first illustrated by the renowned Michelson-Morley experiment, in which light beams were measured as the earth revolved and rotated. The shocking result was actually that the speed of light was precisely the same no matter the earth's movement.

As I wrote in my publication (see quantum-field-theory. net): That the speed of light must be independent of movement was most surprising ... It makes no sense for a light beam - or anything, for that concern - to travel at the exact same speed regardless of the movement of the observer ... except if "something funny" is going on. The "something funny" ended up being much more astonishing than the M-M result itself. Essentially, objects contract when they move! More specifically, they contract in the direction of movement. Think about it. If the path length of Michelson's device in the forward direction contracted by the exact same amount as the extra distance the light beam would certainly have to travel due to motion, the two effects would cancel out. Indeed, this is the only way that Michelson's null result can be illustrated.

However the idea that objects contract when in motion was just as confusing as the Michelson-Morley outcome. Why should this be? Again the explanation is offered by Quantum Field Theory. Quoting once again from my publication:.

We need to recognize that even though the molecular configuration of an object appears to be stationary, the component fields are constantly interacting with one another. The EM field interacts with the matter fields and vice versa, the strong field interacts with the nucleon fields, etc. These interactions are what holds the object together. Now if the object is moving rather fast, this interaction between fields will certainly become more difficult because the fields, on the average, will need to interact through larger distances. Thus the object in motion ought to somehow adjust itself so that the identical interaction between fields can take place. How can it do this? The only way is by decreasing the distance the component fields need to travel. Since the spacing between atoms and molecules, and hence the dimensions of an item, are determined by the nature and arrangement of the force fields that bind them together, the dimensions of an object must therefore be affected by movement.

It is essential to recognize that it is not just Michelson's apparatus that contracted, it is anything and everything in the world, including Michelson himself. Even if the earth's speed and the consequent contraction were a lot greater, we on earth would continue to be ignorant of it. As John Bell discussed a moving observer:.

But will she not see that her meter sticks are contracted when laid out in the [direction of motion] - and even decontract when turned in the [other] direction? No, because the retina of her eye will also be contracted, so that just the same cells receive the image of the meter stick as if both stick and observer were at rest. - J. Bell (B2001, p. 68).

To conclude, for those who wish to comprehend physics, I say use Quantum Field Theory and: WAKE UP AND SMELL THE FIELDS.