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Buckeye
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Does String (M) theory predict a shape for the electron? If so, what shape or shapes are proposed so far?
rtharbaugh1 said:String theory has been criticized for not predicting anything, so I would think the answer must be, NO.
In general, the electron itself is not thought to have any shape, because its boundaries fall under the scale where quantum processes predominate over the statistical processes which give us our common idea of shape of objects. In one sense, the shape of an electron is the shape of the orbital it inhabits, because we cannot say that it is located at any moment in one part of the orbital or in another, or even that it is strictly located in the orbital at all. This interpretation of the shape of an electron makes the electron much larger than the proton, for instance, and it is not a standard approach to the idea of size of an electron.
Instead, we consider the measureable energy of an electron, and use a calculation to determine its Compton wavelength. This measure gives us an idea of the size of the region of space in which an electron might be likely to interact with some other particle which happens to inhabit the same region.
In general, the idea of shape at the scale of the electron is not clearly defined. String theory uses six or more compact dimensions at small scales, and it is a commonly stated legend in physical circles that humans cannot imagine any shape in more than three or maybe four dimensions.
I personally hold some hope that human imagination may not be so limited, but even so I cannot give you any idea of what a six dimensional electron might look like, in string or M or any other theory.
Hope this helps...
Richard
I'm working on understanding a few things, yes. An answer, no, not yet.rtharbaugh1 said:It sounds like you already feel you have an answer and are asking rhetorical questions to provoke a response.
rtharbaugh1 said:I did not say electrons do not have a shape, I only replied to your question about predictions from string theory, which AFAIK are none, at least about the shape of the electron.
I guess I misinterpreted this quote...Yes-No?rtharbaugh1 said:In general, the electron itself is not thought to have any shape...
Sorry, no special knowledge regarding shape and momentum.rtharbaugh1 said:Your new question about momentum transfer seems to suppose that momentum transfer is related to shape. Could you say more about this? It seems you have some kind of special knowledge about it. It could be quite interesting, imho, if momentum transfer were linked to shape somehow.
Hopefully, the newly developed "intense" source of gamma rays will help.rtharbaugh1 said:In any case, the 'charge based radius' sounds to me like it has to do with the effective range in which an electron might be expected to react to a given charge. 10^-11 cm is smaller than the radius of a proton, and IIRC is very close to the quantum limit of measurment.
Heisenberg's supposition (HUP) was useful in its time, but time has past, and it is time for new methods to determine if HUP is meaningful or simply an outcome of the limits of measurement available at that time .rtharbaugh1 said:Perhaps you know that quantum effects begin to predominate at about this scale. Under these conditions it becomes impossible to say exactly where an object is if you know its momentum exactly, or if you know its position exactly at any time, it becomes impossible to know anything about what its momentum is.
The problem with a point charge is that the Charge/Radius value goes to infinity forcing QED to invoke Renormalization to justify the covenants of QED.rtharbaugh1 said:I am pleased to continue discussion with you.
In general, the electron itself is not thought to have any shape. In general, because there may be someone somewhere who wants to insist on a shape. However in the past three years I have been reading about the geometry of very small spaces, and I can say that my sampling of the common opinion leads me to believe, always open to correction, that very few if any current researchers are unwilling to accept the idea that the electron is a point charge, hence zero dimensional, hence without measurable shape.
Information comes in two flavors: Dis- and Pro-, and then there was the Pope who denied Galileo, and Kepler who hid in fear. I prefer to be the doubter, the antagonistic dreamer of a better level of knowledge.rtharbaugh1 said:That is my impression of what people I imagine to be better informed than myself are thinking. Of course, nature is hardly democratic, and truth has often turned out to contradict commonly held beliefs, so I retain some doubt.
Linear and circularly polarized gamma rays with enough intensity can interact with either free or bound electrons of light elements, (H, He...) and will provide more insight on the sizes of the fields of the electron. Crossed beams of femto-sec lasers UV and higher eV range have the potential to test HUP's supposition that we can not determine momentum and position at the same time if IMHO I am foreseeing the future clearly. If however, we are "unlucky" enough to develop a gamma-ray laser, which is in progress, the HUP will surely be tested because the cross-section is small enough.rtharbaugh1 said:As for the HUP, my impression is that it is firmly established and unlikely to be overturned anytime soon. Which high energy gamma ray observations do you have in mind?
Hmmm, let me take a different tact. A single hydrogen atom with one proton and one electron has a radius of 0.53e-8 cm while the classical radius of the electron is 2.8e-11 cm. How do we get a particle with a classical radius of 2.8e-11 cm to convert into a QM particle with a radius of 0.53e-8 cm?rtharbaugh1 said:I was under the impression that we can measure the charge density distribution in an electron field, but that it is everywhere greater than zero. Since the energy is essentially distributed infinitely, the charge density of the field is nowhere infinite. There are no sharp boundaries to the field, it is isotropic. A smaller probe would find the edge, if there were one, but HUP says there isn't any edge. There is only an area, thicker in the middle and thinner as you progress outward. No edge in sight. Maybe it is a Riemann surface.
R
Buckeye said:Hmmm, let me take a different tact. A single hydrogen atom with one proton and one electron has a radius of 0.53e-8 cm while the classical radius of the electron is 2.8e-11 cm. How do we get a particle with a classical radius of 2.8e-11 cm to convert into a QM particle with a radius of 0.53e-8 cm?
Sorry 'bout that. Your right of course.selfAdjoint said:What classical radius are you quoting? None of these numbers mean anything in the field theory of the electron; due to the uncertainty principle it doesn't have a well defined position or trajectory and its "amplitude cloud" does, in certain eigenstates, intersect the proton. This is all handled in the theory and extremely accurate experimental predictions are made.
rtharbaugh1 said:In general, because there may be someone somewhere who wants to insist on a shape. However in the past three years I have been reading about the geometry of very small spaces, and I can say that my sampling of the common opinion leads me to believe, always open to correction, that very few if any current researchers are unwilling to accept the idea that the electron is a point charge, hence zero dimensional, hence without measurable shape.
The String of an Electron is a theoretical concept proposed by string theory, which suggests that all elementary particles, including electrons, are made up of tiny vibrating strings rather than being point-like particles.
The String of an Electron differs from traditional particle theory in that it suggests that electrons are not point-like particles, but rather tiny strings that vibrate at different frequencies to give rise to different properties.
The String of an Electron is significant because it provides a potential solution to the inconsistencies between quantum mechanics and general relativity. It also offers a way to unify all fundamental forces of nature into one theory.
Currently, there is no definitive experimental evidence to support the String of an Electron. However, string theory is still a highly active area of research, and scientists are working on ways to test its predictions.
If string theory is proven to be true, it could have significant implications for our understanding of the universe and could potentially lead to new technologies and advancements in physics.