What Is the Fourier Transform of the Density Matrix of cos(x+y)*cos(x-y)?

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The discussion centers on the Fourier transform of the density matrix defined by the expression \(\rho = \cos(x+y)^\alpha \cos(x-y)^\alpha\). The integral in question is \(\frac{1}{\pi} \int_{-\infty}^{\infty} \cos(x+y)^\alpha \cos(x-y)^\alpha e^{2ipy} dy\), which represents the Fourier transform of the off-diagonal elements of the density matrix. Participants suggest consulting "Fourier integral tables" for potential solutions and emphasize the importance of defining the domain for the parameter \(\alpha\).

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Fourier transform of density matrix of cos(x+y)*cos(x-y)

I would like to know whether there exists a solution to the following integral,

\frac{1}{\pi} \int\limits_{-\infty}^{\infty} \cos(x+y)^\alpha \cos(x-y)^\alpha e^{2ipy}

The above expression is the Fourier transform of the off-diagonal elements of the density matrix,

\rho = \cos(x+y)^\alpha \cos(x-y)^\alpha

Any advice, or reference to books/articles, would be greatly appreciated.
 
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Start by defining the domain for α.
Google "Fourier integral tables" should help.
 

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