One Special Identity between the complete elliptic integrals of the first and the third kind

Details One Special Identity between the complete elliptic integrals of the first and the third kind One Special Identity between the complete elliptic integrals of the first and the third kind

2008-02-27

arxiv.org/abs/0802.3977v1

Physics

Mathematical Physics

8 pages, 2 figures

Scientific paper

I prove an identity between the first kind and the third kind complete elliptic integrals with the following form: $$\Pi({(1+x) (1-3 x)\over (1-x) (1+3 x)}, {(1+x)^3(1-3 x)\over (1-x)^3 (1+3x)})- {1+ 3 x \over 6 x} K ({(1+x)^3(1-3x)\over (1-x)^3 (1+3x)}) = 0, (0< x < 1); =-{\pi\over 12} {(x-1)^{3/2}\sqrt{1+3 x}\over x} (x<0 or x>1).$$ This relation can be applied to eliminate the complete elliptic integral of the third kind from the analytic solutions of the imaginary part of two-loop sunset diagrams in the equal mass case. The validity of this relation in the complex domain is also briefly discussed.

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