Imprint of anisotropic primordial non-Gaussianity on halo intrinsic alignments in simulations

Using N-body simulations of cosmological large-scale structure formation, for the first time, we show that the anisotropic primordial non-Gaussianity causes a scale-dependent modification, given by 1 /k2 at small k limit, in the three-dimensional power spectra of halo shapes (intrinsic alignments), whilst the conventional power spectrum of halo number density field remains unaffected. We discuss that wide-area imaging and spectrocopic surveys observing the same region of the sky allow us to constrain the quadrupole primordial non-Gaussianity coefficient ... at a precision comparable with or better than that of the cosmic microwave background. (ProQuest: … denotes formula omitted.)