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- W3100860137 abstract "We study the local response to long wavelength fluctuations in cosmological $N$-body simulations, focusing on the matter and halo power spectra, halo abundance and non-linear transformations of the density field. The long wavelength mode is implemented using an effective curved cosmology and a mapping of time and distances. The method provides an alternative, most probably more precise, way to measure the isotropic halo biases. Limiting ourselves to the linear case, we find generally good agreement between the biases obtained from the curvature method and the traditional power spectrum method at the level of a few percent. We also study the response of halo counts to changes in the variance of the field and find that the slope of the relation between the responses to density and variance differs from the naive derivation assuming a universal mass function by 18%. This has implications for measurements of the amplitude of local non-Gaussianity using scale dependent bias. We also analyze the halo power spectrum and halo-dark matter cross-spectrum response to long wavelength fluctuations and derive second order halo bias from it, as well as the super-sample variance contribution to the galaxy power spectrum covariance matrix." @default.
- W3100860137 created "2020-11-23" @default.
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- W3100860137 date "2016-09-05" @default.
- W3100860137 modified "2023-10-06" @default.
- W3100860137 title "Linear response to long wavelength fluctuations using curvature simulations" @default.
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- W3100860137 doi "https://doi.org/10.1088/1475-7516/2016/09/007" @default.
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