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On the Bispectra of Very Massive Tracers in the Effective Field Theory of Large-Scale Structure
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On the Bispectra of Very Massive Tracers in the Effective Field Theory of Large-Scale Structure
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Paper
On the Bispectra of Very Massive Tracers in the Effective Field Theory of Large-Scale Structure
2017
Overview
The Effective Field Theory of Large-Scale Structure (EFTofLSS) provides a consistent perturbative framework for describing the statistical distribution of cosmological large-scale structure. In a previous EFTofLSS calculation that involved the one-loop power spectra and tree-level bispectra, it was shown that the \\(k\\)-reach of the prediction for biased tracers is comparable for all investigated masses if suitable higher-derivative biases, which are less suppressed for more massive tracers, are added. However, it is possible that the non-linear biases grow faster with tracer mass than the linear bias, implying that loop contributions could be the leading correction to the bispectra. To check this, we include the one-loop contributions in a fit to numerical data in the limit of strongly enhanced higher-order biases. We show that the resulting one-loop power spectra and higher-derivative plus leading one-loop bispectra fit the two- and three-point functions respectively up to \\(k 0.19\\ h\\ Mpc^-1\\) and \\(k 0.14\\ h\\ Mpc^-1\\) at the percent level. We find that the higher-order bias coefficients are not strongly enhanced, and we argue that the gain in perturbative reach due to the leading one-loop contributions to the bispectra is relatively small. Thus, we conclude that higher-derivative biases provide the leading correction to the bispectra for tracers of a very wide range of masses.
Publisher
Cornell University Library, arXiv.org
Subject
