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We measure statistically anisotropic signatures imprinted inthree-dimensional galaxy clustering using bipolar spherical harmonics (BipoSHs)in both Fourier space and configuration space. We then constrain a well-knownquadrupolar anisotropy parameter $g_{2M}$ in the primordial power spectrum,parametrized by $P(\vec{k}) = \bar{P}(k) [ 1 + \sum_{M} g_{2M} Y_{2M}(\hat{k})]$, with $M$ determining the direction of the anisotropy. Such an anisotropicsignal is easily contaminated by artificial asymmetries due to specific surveygeometry. We precisely estimate the contaminated signal and finally subtract itfrom the data. Using the galaxy samples obtained by the Baryon OscillationSpectroscopic Survey Data Release 12, we find no evidence for violation ofstatistical isotropy, $g_{2M}$ for all $M$ to be of zero within the $2\sigma$level. The $g_{2M}$-type anisotropy can originate from the primordial curvaturepower spectrum involving a directional-dependent modulation $g_* (\hat{k} \cdot\hat{p})^2$. The bound on $g_{2M}$ is translated into $g_*$ as $-0.09 < g_* <0.08$ with a $95\%$ confidence level when $\hat{p}$ is marginalized over.

Limits on statistical anisotropy from BOSS DR12 galaxies using bipolar spherical harmonics