Doppler Effect: Solving 4-Vectors Problem

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SUMMARY

The discussion focuses on the application of Lorentz transformations to analyze the Doppler Effect for a photon traveling in the x-direction, represented by its 4-momentum (p, p, 0, 0). Participants clarify that the task involves determining the Lorentz transformation matrix for a frame moving at speed v in the y-direction and calculating the resulting 4-momentum of the photon in this new frame. The conversation emphasizes the importance of understanding both the transformation matrix and the implications for the photon's momentum in different inertial frames.

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  • Understanding of 4-vectors in special relativity
  • Familiarity with Lorentz transformations
  • Basic knowledge of the Doppler Effect in physics
  • Concept of 4-momentum in relativistic physics
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karoliina
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Homework Statement


Here is my problem:
DOPPLER EFFECT:
Consider a photon traveling in the x direction. Ignoring the y and z components, and setting c=1, the 4-momentum is (p,p). In matrix notation, what are the Lorentz transformations for the frames traveling to the left and to the right at speed v? What is the new 4-momentum of the photon in these new frames?
That's all that I have... :(
Thank you in advance for any suggestion!
Karoliina.
 
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Welcome to PF!

Hi Karoliina ! Welcome to PF! :wink:

I think it's asking, if the photon is going in the x-direction, so its 4-momentum is (p,p,0,0), what is the Lorentz transformation matrix for speed v in the y-direction, and what does that convert (p,p,0,0) to?

Show us what you get! :smile:
 

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