Dirac Delta in polar coordinates

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SUMMARY

The discussion centers on the correct representation of the Dirac delta function in polar coordinates, specifically for a circle of radius 'a'. The two proposed forms are δ(r-a) and δ(r-a)/|r-a|. The consensus suggests that the appropriate formulation is δ(r-a), as it correctly represents the delta function's behavior at the specified radius. Participants recommend using the transformation from Cartesian to polar coordinates to derive the solution accurately.

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  • Understanding of the Dirac delta function
  • Familiarity with polar coordinates
  • Knowledge of coordinate transformations
  • Basic calculus and integration techniques
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  • Study the properties of the Dirac delta function in different coordinate systems
  • Learn about coordinate transformations, specifically from Cartesian to polar coordinates
  • Explore applications of the Dirac delta function in physics and engineering
  • Review integral calculus involving delta functions
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johnsmi
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Homework Statement



Hi, I would like to know what is the right way to write continuous deltas standing in a circle of radius a?

Homework Equations





The Attempt at a Solution



I am not sure weather it's δ(r-a) or is it
δ(r-a)/|r-a|
Thank you
 
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You know that:
[tex] f(x,y)=\int_{-\infty}^{\infty}f(u,v)\delta (x-u)\delta (y-v)dxdy[/tex]
Now make a change of co-ordinates from Cartesian to polar, and the answer should drop out for you. Failing that look it up on Wikipedia :o)

Mat
 

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