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- W2279325484 abstract "We present a fully relativistic calculation of the matter bispectrum at second order in cosmological perturbation theory assuming a Gaussian primordial curvature perturbation. For the first time we perform a full numerical integration of the bispectrum for both baryons and cold dark matter using the second-order Einstein-Boltzmann code, SONG. We review previous analytical results and provide an improved analytic approximation for the second-order kernel in Poisson gauge which incorporates Newtonian nonlinear evolution, relativistic initial conditions, the effect of radiation at early times and the cosmological constant at late times. Our improved kernel provides a percent level fit to the full numerical result at late times for most configurations, including both equilateral shapes and the squeezed limit. We show that baryon acoustic oscillations leave an imprint in the matter bispectrum, making a significant impact on squeezed shapes." @default.
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- W2279325484 date "2016-05-25" @default.
- W2279325484 modified "2023-10-15" @default.
- W2279325484 title "The intrinsic matter bispectrum in ΛCDM" @default.
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- W2279325484 doi "https://doi.org/10.1088/1475-7516/2016/05/058" @default.
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