TY - JOUR
T1 - Breaking baryon-cosmology degeneracy with the electron density power spectrum
AU - Nicola, Andrina
AU - Villaescusa-Navarro, Francisco
AU - Spergel, David N.
AU - Dunkley, Jo
AU - Anglés-Alcázar, Daniel
AU - Davé, Romeel
AU - Genel, Shy
AU - Hernquist, Lars
AU - Nagai, Daisuke
AU - Somerville, Rachel S.
AU - Wandelt, Benjamin D.
N1 - 31 pages, 10 figures, to be submitted to JCAP
Publisher Copyright:
© 2022 IOP Publishing Ltd and Sissa Medialab.
PY - 2022/4/22
Y1 - 2022/4/22
N2 - Uncertain feedback processes in galaxies affect the distribution of matter, currently limiting the power of weak lensing surveys. If we can identify cosmological statistics that are robust against these uncertainties, or constrain these effects by other means, then we can enhance the power of current and upcoming observations from weak lensing surveys such as DES, Euclid, the Rubin Observatory, and the Roman Space Telescope. In this work, we investigate the potential of the electron density auto-power spectrum as a robust probe of cosmology and baryonic feedback. We use a suite of (magneto-)hydrodynamic simulations from the CAMELS project and perform an idealized analysis to forecast statistical uncertainties on a limited set of cosmological and physically-motivated astrophysical parameters. We find that the electron number density auto-correlation, measurable through either kinematic Sunyaev-Zel'dovich observations or through Fast Radio Burst dispersion measures, provides tight constraints on $\Omega_{m}$ and the mean baryon fraction in intermediate-mass halos, $\bar{f}_{\mathrm{bar}}$. By obtaining an empirical measure for the associated systematic uncertainties, we find these constraints to be largely robust to differences in baryonic feedback models implemented in hydrodynamic simulations. We further discuss the main caveats associated with our analysis, and point out possible directions for future work.
AB - Uncertain feedback processes in galaxies affect the distribution of matter, currently limiting the power of weak lensing surveys. If we can identify cosmological statistics that are robust against these uncertainties, or constrain these effects by other means, then we can enhance the power of current and upcoming observations from weak lensing surveys such as DES, Euclid, the Rubin Observatory, and the Roman Space Telescope. In this work, we investigate the potential of the electron density auto-power spectrum as a robust probe of cosmology and baryonic feedback. We use a suite of (magneto-)hydrodynamic simulations from the CAMELS project and perform an idealized analysis to forecast statistical uncertainties on a limited set of cosmological and physically-motivated astrophysical parameters. We find that the electron number density auto-correlation, measurable through either kinematic Sunyaev-Zel'dovich observations or through Fast Radio Burst dispersion measures, provides tight constraints on $\Omega_{m}$ and the mean baryon fraction in intermediate-mass halos, $\bar{f}_{\mathrm{bar}}$. By obtaining an empirical measure for the associated systematic uncertainties, we find these constraints to be largely robust to differences in baryonic feedback models implemented in hydrodynamic simulations. We further discuss the main caveats associated with our analysis, and point out possible directions for future work.
KW - feedback in galaxies
KW - hydrodynamical simulations
KW - power spectrum
U2 - 10.1088/1475-7516/2022/04/046
DO - 10.1088/1475-7516/2022/04/046
M3 - Article
SN - 1475-7516
VL - 2022
SP - 1
EP - 31
JO - Journal of Cosmology and Astroparticle Physics (JCAP)
JF - Journal of Cosmology and Astroparticle Physics (JCAP)
IS - 4
M1 - 046
ER -