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Imprints of Oscillatory Bispectra on Galaxy Clustering
- Publication Year :
- 2018
-
Abstract
- Long-short mode coupling during inflation, encoded in the squeezed bispectrum of curvature perturbations, induces a dependence of the local, small-scale power spectrum on long-wavelength perturbations, leading to a scale-dependent halo bias. While this scale dependence is absent in the large-scale limit for single-field inflation models that satisfy the consistency relation, certain models such as resonant non-Gaussianity show a peculiar behavior on intermediate scales. We reconsider the predictions for the halo bias in this model by working in Conformal Fermi Coordinates, which isolate the physical effects of long-wavelength perturbations on short-scale physics. We find that the bias oscillates with scale with an envelope similar to that of equilateral non-Gaussianity. Moreover, the bias shows a peculiar modulation with the halo mass. Unfortunately, we find that upcoming surveys will be unable to detect the signal because of its very small amplitude. We also discuss non-Gaussianity due to interactions between the inflaton and massive fields: our results for the bias agree with those in the literature.<br />Comment: 27+15 pages, 6 figures, matches JCAP version
Details
- Database :
- arXiv
- Publication Type :
- Report
- Accession number :
- edsarx.1804.07295
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1088/1475-7516/2018/09/003