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We analyse the clustering of 22,361 quasars between redshift 2.2 < z < 2.9observed with the Sloan Digital Sky Survey (SDSS)-III Baryon OscillationSpectroscopic Survey (BOSS), which are included in the ninth data release(DR9). We fit the clustering results with a {\Lambda}CDM model to calculate thelinear bias of the quasar sample, b=3.74\pm 0.12. The measured value of bias isconsistent with the findings of White et al. (2012), where they analyse almostthe same quasar sample, although only in the range, s<40 Mpc/h. At large scaleswe observe an excess or plateau in the clustering correlation function. Byfitting a model that incorporates a scale dependent additional term in the biasintroduced by primordial non-Gaussianity of the local type, we calculate theamplitude of the deviation from the Gaussian initial conditions as 70<f_NL< 190at the 95% confidence level. We correct the sample from systematics accordingto the methods of Ross et al. (2011); Ho et al. (2012) and Ross et al.(2011,2012b), with the f_NL measurements after the application of the twomethods being consistent with each other. Finally we use cross-correlationsacross redshift slices to test the corrected sample for any remaining unknownsources of systematics, but the results give no indication of any such furthererrors. We consider as our final results on non-Gaussianity of the local type,46<f_NL< 158 at 95% confidence, after correcting the sample with the weightsmethod of Ross et al. (2011, 2012b). These results are consistent with previoustight constraints on non-Gaussianity from other LSS surveys, but are in tensionwith the latest results from the CMB.

Search for primordial non-Gaussianity in the quasars of SDSS-III BOSS DR9