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Non-Gaussian Shape Discrimination with Spectroscopic Galaxy Surveys · Around

2014

Non-Gaussian Shape Discrimination with Spectroscopic Galaxy Surveys

Byun, Joyce, Bean, Rachel

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[Abridged] We consider how galaxy clustering data, from Mpc to Gpc scales, from upcoming large scale structure surveys, such as Euclid and DESI, can provide discriminating information about the bispectrum shape arising from a variety of inflationary scenarios.

Through exploring in detail the weighting of shape properties in the calculation of the halo bias and halo mass function we show how they probe a broad range of configurations, beyond those in the squeezed limit, that can help distinguish between shapes with similar large scale bias behaviors.
We assess the impact, on constraints for a diverse set of non-Gaussian shapes, of galaxy clustering information in the mildly non-linear regime, and surveys that span multiple redshifts and employ different galactic tracers of the dark matter distribution.
Fisher forecasts are presented for a Euclid-like spectroscopic survey of H$\alpha$-selected emission line galaxies (ELGs) using recent revisions of the expected H$\alpha$ luminosity function, and a DESI-like survey, of luminous red galaxies (LRGs) and [O-II] doublet-selected ELGs, in combination with Planck-like CMB temperature and polarization data.

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