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Lyman alpha forest-halo cross-correlations in effective field theory

Anton Chudaykin1,* and Mikhail M. Ivanov2,3,†

  • *Contact author: anton.chudaykin@unige.ch
  • †Contact author: ivanov99@mit.edu
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Phys. Rev. D 111, 083515 – Published 9 April, 2025

DOI: https://doi.org/10.1103/PhysRevD.111.083515

Abstract

We provide a perturbative effective field theory (EFT) description for anisotropic (redshift-space) correlations between the Lyman alpha forest and a generic biased tracer of matter, which could be represented by quasars, high-redshift galaxies, or dark matter halos. We compute one-loop EFT power spectrum predictions for the combined analysis of the Lyman alpha and biased tracers’ data and test them on the publicly available high-fidelity Sherwood simulations. We use massive and light dark matter halos at redshift z=2.8 as proxies for quasars and high-redshift galaxies, respectively. In both cases, we demonstrate that our EFT model can consistently describe the complete data vector consisting of the Lyman alpha forest auto spectrum, the halo auto spectrum, and the Lyman alpha-halo cross spectrum. We show that the addition of cross-correlations significantly sharpens constraints on EFT parameters of the Lyman alpha forest and halos. In the combined analysis, our EFT model fits the simulated cross-spectra with a percent level accuracy at kmax=1h  Mpc−1, which represents a significant improvement over previous analytical models. Thus, our work provides precision theoretical tools for full-shape analyses of Lyman alpha-quasar cross-correlations with ongoing and upcoming spectroscopic surveys.

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Phys. Rev. D 111, 083515– Published 9 April, 2025
  • Received 26 January 2025
  • Accepted 15 March 2025
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