2008/06/12 by Carmelita Carbone, Licia Verde, Sabino Matarrese · 4 citations
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #astro-ph
paper · pdf · doi:10.1086/592020
published as Astrophys.J.684:L1-L4,2008 · 5pages, 1 Table, typos corrected
arxiv created 2008/06/12 · openalex publication_date 2008/08/13 · arxiv updated 2010/03/26 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/04
We forecast constraints on primordial non-Gaussianity achievable from forthcoming surveys by exploiting the scale-dependent halo bias introduced on large scales by non-Gaussian initial conditions. We explore the performance of exploiting both the shape of the galaxy power spectrum on large scales and the cross-correlation of galaxies with cosmic microwave background maps through the integrated Sachs-Wolfe effect. We find that future surveys can detect primordial non-Gaussianity of the local form with a non-Gaussianity parameter | f NL | of order unity. This is particularly exciting because, while the simplest single-field slow-roll models of inflation predict a primordial | f NL | ≪ 1, this signal sources extra contributions to the effective f NL of large-scale structures that are expected to be above our predicted detection threshold.