Solve Campbell-Hausdorff Formula to Prove ei/h omega.L (x , p) e-i/h omega.L

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In summary, the conversation discusses the use of the Campbell-Hausdorff formula in proving a formula involving the momentum operator, position operator, and rotation in SO(3). The person is struggling with evaluating the commutators and is seeking help.
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MrRobot
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Homework Statement


Hi, I am really struggling with this Campbell-Hausdorff formula. The question requires me to use it to prove

ei/h omega.L (x , p) e-i/h omega.L = R(omega).(x, p) where L is the momentum operator, x and p are the position and momentum operator respectively and R(omega) is the rotation in SO(3) R(omega) = eomegaa (it)a

Homework Equations

The Attempt at a Solution


So I have only managed to expand the LHS using the Campbell formula and now I am failing to evaluate the commutators. Thank you very much for the help.
 
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  • #2
Use [itex](it_{i})_{jk} = \epsilon_{ijk}[/itex], to write [itex](i\omega \cdot t)_{jk} = \omega_{i}\epsilon_{ijk}[/itex]. You also need to use [itex][L_{i} , X_{j}] = i \epsilon_{ijk} X_{k}[/itex], and similar one for [itex]P_{j}[/itex].
 

Related to Solve Campbell-Hausdorff Formula to Prove ei/h omega.L (x , p) e-i/h omega.L

1. What is the Campbell-Hausdorff formula and why is it important?

The Campbell-Hausdorff formula is a mathematical formula used to simplify and calculate the exponential of a sum of operators. It is important in the field of quantum mechanics and physics as it allows for easier manipulation of operators and solving complex equations.

2. How does the Campbell-Hausdorff formula relate to the concept of ei/h omega.L (x,p) e-i/h omega.L?

The Campbell-Hausdorff formula can be used to prove the identity of ei/h omega.L (x,p) e-i/h omega.L, which is a commonly used expression in quantum mechanics to represent the displacement operator. By using the formula, we can show that this expression is equivalent to the exponential of a sum of operators.

3. What is the significance of the parameter h in the Campbell-Hausdorff formula?

The parameter h in the Campbell-Hausdorff formula represents Planck's constant, which is a fundamental constant in quantum mechanics. It relates to the uncertainty principle and plays a crucial role in understanding the behavior of particles at the quantum level.

4. How is the Campbell-Hausdorff formula used to solve equations involving the exponential of operators?

The Campbell-Hausdorff formula provides a systematic way to simplify and solve equations involving the exponential of operators. It allows us to transform the original equation into a simpler form, which can then be solved using other mathematical methods.

5. Are there any limitations to using the Campbell-Hausdorff formula in solving equations?

While the Campbell-Hausdorff formula is a powerful tool in solving equations involving the exponential of operators, it may not always provide the most efficient solution. In some cases, it may be more practical to use other methods or approximations to solve the equation. Additionally, the formula may not work for all types of operators and may require modifications for certain cases.

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