On the road to percent accuracy VI the nonlinear power spectrum for interacting dark energy with baryonic feedback and massive neutrinos

Pedro Carrilho*, Karim Carrion, Benjamin Bose, Alkistis Pourtsidou, Juan Carlos Hidalgo, Lucas Lombriser, Marco Baldi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Understanding nonlinear structure formation is crucial for fully exploring the data generated by stage IV surveys, requiring accurate modelling of the power spectrum. This is challenging for deviations from ΛCDM, but we must ensure that alternatives are well tested, to avoid false detections. We present an extension of the halo model reaction framework for interacting dark energy. We modify the halo model including the additional force present in the Dark Scattering model and implement it into ReACT. The reaction is combined with a pseudo spectrum from EuclidEmulator2 and compared to N-body simulations. Using standard mass function and concentration-mass relation, we find predictions to be 1% accurate at z = 0 up to k = 0.8 h/Mpc for the largest interaction strength tested (ξ = 50 b/GeV), improving to 2 h/Mpc at z = 1. For smaller interaction strength (10 b/GeV), we find 1% agreement at z = 1 up to scales above 3.5 h/Mpc, being close to 1 h/Mpc at z = 0. Finally, we improve our predictions with the inclusion of baryonic feedback and massive neutrinos and study degeneracies between the effects of these contributions and those of the interaction. Limiting the scales to where our modelling is 1% accurate, we find a degeneracy between the interaction and feedback, but not with massive neutrinos. We expect the degeneracy with feedback to be resolvable by including smaller scales. This work represents the first analytical tool for calculating the nonlinear spectrum for interacting dark energy models.
Original languageEnglish
Pages (from-to)3691-3702
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Volume512
Issue number3
Early online date10 Mar 2022
DOIs
Publication statusPublished - 1 May 2022

Keywords / Materials (for Non-textual outputs)

  • cosmology: theory
  • large-scale structure of Universe
  • methods: analytical
  • methods: numerical

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