Multitracer technique for galaxy bispectrum - An application to constraints on non-local primordial non-Gaussianities -

Abstract

We explore the use of galaxy bispectra with multitracer technique as a possible probe of primordial non-Gaussianities. We forecast future constraints on non-linearity parameters, $f_{\mathrm{NL}}^{\mathrm{eq}}$ and $f_{\mathrm{NL}}^{\mathrm{orth}}$, which respectively characterize the equilateral- and orthogonal-types primordial bispectra, and show that the multitracer analysis would be effective with reducing the cosmic-variance noise if the number density of galaxies is high enough. We find that the measurement of galaxy bispectrum by future galaxy surveys can reach the constraints on the non-local type primordial non-Gaussianities to the level severer than current one which has been obtained by cosmic microwave background observations.

5 pages, 2 figures; v2: replaced to match the published version in PRD

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