Raising and Lowering Operators

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In summary, the conversation discusses the appearance and elegance of the raising and lowering operators in Griffith and Shankar. The operators are related to the harmonic oscillator, angular-momentum eigenstates, and free-particle modes in QFT. They are separable in all dimensions, including one-dimensional, and are dependent on the dimensionality of the system.
  • #1
jjohnson
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In Griffith and Shankar, the raising and lowering operator seem to appear from nowhere, but it seems really elegant.

Where do they come from, is it some corollary from certain mathematical structure?

Can anyone give a brief explanation?
 
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  • #2
In which context? There are lowering and raising operators for the harmonic oscillator, angular-momentum eigenstates (closely related by the way due to the SU(N) symmetry of the N-dimensional symmetric harmonic oscillator) and for free-particle modes in QFT.
 
  • #3
Thank you for replying.
So for harmonic oscillator, all dimensions are separable (H = Hx+Hy+Hz), does it depend on dimensionality? Even for one-dimensional harmonic oscillator, we can use raising and lowering operators.

Thanks
 

1. What are raising and lowering operators?

Raising and lowering operators are mathematical tools used in quantum mechanics to describe the behavior of particles with spin. They are represented by matrices and are used to calculate the possible states of a particle's spin.

2. How do raising and lowering operators work?

Raising operators increase the value of a particle's spin by a certain amount, while lowering operators decrease it. They operate on a specific state of a particle's spin, changing it to a different state with a higher or lower spin value.

3. What is the significance of raising and lowering operators?

Raising and lowering operators are important because they allow us to describe the behavior of particles with spin in quantum mechanics. They also help us understand the relationship between different spin states and how they can change through the application of these operators.

4. How are raising and lowering operators used in quantum mechanics?

Raising and lowering operators are used in various equations and mathematical models in quantum mechanics, such as the Schrödinger equation and the Heisenberg uncertainty principle. They also play a crucial role in the study of quantum systems and their properties.

5. Are raising and lowering operators only used in quantum mechanics?

No, raising and lowering operators have applications in other areas of physics as well, such as in the study of symmetries and group theory. They are also used in other fields like chemistry, where they help describe the behavior of atomic and molecular systems.

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