For the special case (d=2), we may regard (mathbb{R}^{2} cong mathbb{C}), so that (omega) is a complex
Question:
For the special case \(d=2\), we may regard \(\mathbb{R}^{2} \cong \mathbb{C}\), so that \(\omega\) is a complex number and \(e\) is a unit complex number. Show that the weighted spherical distribution with weight proportional to the degree \(k\) harmonic perturbation
\[
1+\Re\left(a \bar{e}^{k}ight) \sin ^{k} \theta
\]
is transformed to
\[
\frac{\Gamma(d)}{\pi^{d / 2} \Gamma(d / 2)} \frac{d \omega}{\left(1+\|\omega\|^{2}ight)^{d}} \times\left(1+\frac{2 \Re\left(a \bar{\omega}^{k}ight)}{\left(1+|\omega|^{2}ight)^{k}}ight)
\]
and is positive for \(|a| \leq 1\).
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