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Charles Brown
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Why do all particles spin? What is the force that causes this spin?
cbetanco said:Yes, we know that spin is a natural consequence of any Lorentz invariant quantum theory (relativistic quantum mechanics). But in non-relativistic quantum mechanics, it is put in by hand so to say
As mathman said, there are no forces involved. They don't ever start to spin. Spin is simply one of the numbers that distinguishes between the different particle species that can exist in a spacetime such that "space" is isotropic.Charles Brown said:Would it not be helpful in understanding quantum physics to know why paricles spin and what forces are at work to start the spin and to maintain it?
In QM, the assumption that space is isotropic takes the form "there's a group homomorphism from SU(2) into the set of linear operators on the Hilbert space". SU(2) is the covering group of the rotation group SO(3), and SO(3) is a subgroup of both the Galilean group and the Poincaré group. For this reason, I would say that spin is just as much a part of non-relativistic QM as of relativistic QM. It's made a part of the theory by an assumption about the existence of a representation of the symmetry group of the spacetime we have chosen to consider.cbetanco said:while Dirac showed that spin a natural consequence of writing a first order, Lorentz invariant Shrodinger like Equation for the electron.
Most of the stuff taught in a typical quantum physics textbook consists of fundamental facts that we know for sure, and not of conjecture.Charles Brown said:Are there any fundamental facts that we know for sure? Is all quantum physics conjecture?
Charles Brown said:Are there any fundamental facts that we know for sure? Is all quantum physics conjecture?
In general yes, although there are reactions in which electrons may be created or destroyed.Charles Brown said:PFMentor- thanks
So are electrons that existed soon after big bang still around still acting as electrons?
mathman said:In general yes, although there are reactions in which electrons may be created or destroyed.
jewbinson said:Out of nothing? Really? Like what?
Charles Brown said:My interest is useing elemental particles as a communication device over large distances and time,has there been research on this?
The spin of a subatomic particle is an intrinsic property that describes the angular momentum of the particle. It is not related to the physical spinning of the particle, but rather a fundamental characteristic that affects its behavior.
The spin of a subatomic particle is measured by using a technique called scattering, where the particle is sent through a magnetic field and its trajectory is observed. By analyzing the deflection of the particle, the spin can be determined.
A particle with a non-zero spin has a magnetic moment, which means it can interact with magnetic fields. This can have significant implications in fields such as quantum mechanics and particle physics.
No, the spin of a subatomic particle is a constant property and cannot change. It is considered a quantum number, similar to an electron's charge, and is a fundamental characteristic of the particle.
The spin of a subatomic particle determines how it interacts with other particles, particularly in terms of their angular momentum and spin states. This is crucial in understanding the behavior of particles in various physical processes and reactions.