Linked Questions

14
votes
3answers
630 views

How do we prove or disprove that a particle has no internal structure? [duplicate]

In many pop physics books I have read that an electron has no internal structure. How do we know that and how can we rigorously prove that it has no such structure at all?
5
votes
1answer
341 views

Are electrons simple? Do they have any inner structure? [duplicate]

The Planck length is far smaller than the classical electron radius. Could the electron have structure?
1
vote
2answers
316 views

Is there any evidence to suggest that subatomic particles have 3D physiscal size? [duplicate]

What I'm asking is do subatomic particles like a proton have a volume or any 3 dimensional size? Or are they just points?
-3
votes
1answer
245 views

What is the smallest particle? What is the building block of an electron? [duplicate]

I'm curious. Why when I was 5 years old did I rip things apart in half... Always trying to get another half... is it endless? I took a leaf and ripped it in half, and kept on going... God?
2
votes
0answers
335 views

Why does the electric dipole moment of the electron tell us about its sphericity? [duplicate]

There are a bunch of experiments that claim to show that the electron is highly spherical by measuring the electron electric dipole moment. See e.g.: http://physicsworld.com/cws/article/news/2013/nov/...
1
vote
1answer
180 views

What does it mean for a particle to have volume? [duplicate]

As far as I understand, we do not know whether an electron is a point particle or not, but we have a very low upper bound for its potential volume. If it turns out that electrons do have volume, what ...
2
votes
0answers
159 views

Electric dipole moment(EDM) underlying physics [duplicate]

I read in a physics today paper, The electron can have nonvanishing EDM only if nature violates symmetry under time reversal (T) and under the combined operations of charge conjugation (C), which ...
0
votes
1answer
82 views

Does the electron have size? [duplicate]

Can we ascertain the size of the electron? If it really is zero radius, then it can't be matter because it doesn't occupy space? Definition of matter (Google): physical substance in general, as ...
0
votes
0answers
76 views

What is the volume of electron? [duplicate]

I know that electron has mass , and that is particle( a body which has only mass and whose size is negligible) but can we ever calculate the volume of the electron . if yes how much it is . if no why?
0
votes
0answers
73 views

Size of an elementary particle [duplicate]

Do we have a well defined mathematical expression denoting the size of a fundamental particle with no internal structure (electron for example) ? If we do, how does it fit in with the uncertainty ...
1
vote
0answers
30 views

How is the mass of an electron distributed? [duplicate]

Since the position of an electron is not determined, how is it’s mass distributed ? In other words, how does an electron curve space time ? .
49
votes
6answers
9k views

Do electrons have shape?

According to the Wikipedia page on the electron: The electron has no known substructure. Hence, it is defined or assumed to be a point particle with a point charge and no spatial extent. Does ...
25
votes
4answers
3k views

Classical proof of the gyromagnetic ratio $g=2$

I was reading Representing Electrons: A Biographical Approach to Theoretical Entities, by Theodore Arabatzis. At a certain point, where he is explaining the history of the magnetic moment of the ...
15
votes
3answers
1k views

Is there an electric dipole moment in an electron?

I just read an article in Science News (p7, 11/10/2018, link here) where researchers looked for an electric dipole moment in an electron. They spoke of charge separation between the positive and ...
6
votes
4answers
2k views

Is charge point-like or a smear?

Coulomb gave the law for the force between two static charges while considering them to be points in space. But the differential form of Gauss' Law talks about charge densities, a thing possible only ...

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