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Developing a Theoretical Model for the Resummation of Infrared Effects in the Pre- and Post-Reconstruction Galaxy Bispectra (https://youtu.be/bHdlIi3jQ4A)

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arXiv:2403.18262v1 Announce Type: new
Abstract: While substantial progress has been made in studying the pre-reconstruction galaxy bispectrum, investigations of the post-reconstruction bispectrum are still in nascent stages. In this paper, we present a bispectrum model that incorporates one-loop corrections in the Standard Perturbation Theory (SPT), while simultaneously addressing infrared (IR) effects in the post-reconstruction density fluctuations in a non-perturbative approach. This model accurately captures the nonlinear behavior of the Baryon Acoustic Oscillation (BAO) signal within the post-reconstruction bispectrum framework. Furthermore, the incorporation of the one-loop correction extends its applicability to smaller scales. Given that the approach to addressing IR effects remains invariant before and after the reconstruction process, the resulting IR-resummed bispectrum model exhibits uniformity across both scenarios. Throughout this analysis, we achieve a comprehensive and unified description of the bispectrum that seamlessly spans the pre- and post-reconstruction phases. An explanatory video is available at https://youtu.be/bHdlIi3jQ4A.

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