Cosmology at high redshift — a probe of fundamental physics

• Published in: Journal of cosmology and astroparticle physics Vol. 2021; no. 12; pp. 49 - 110
• Main Authors: Sailer, Noah, Castorina, Emanuele, Ferraro, Simone, White, Martin
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.12.2021; Institute of Physics (IOP)
• Subjects: Astronomical models; ASTRONOMY AND ASTROPHYSICS; Cosmic microwave background; cosmological parameters from LSS; cosmological perturbation theory; Cosmology; Cross correlation; Dark energy; Fisher information; Formalism; Galaxies; gravitational lensing; Neutrinos; Perturbation theory; Polls & surveys; Red shift; redshift surveys
• ISSN: 1475-7516; 1475-7516
• DOI: 10.1088/1475-7516/2021/12/049

An observational program focused on the high redshift (2<z<6) Universe has the opportunity to dramatically improve over upcoming LSS and CMB surveys on measurements of both the standard cosmological model and its extensions. Using a Fisher matrix formalism that builds upon recent advances in Lagrangian perturbation theory, we forecast constraints for future spectroscopic and 21-cm surveys on the standard cosmological model, curvature, neutrino mass, relativistic species, primordial features, primordial non-Gaussianity, dynamical dark energy, and gravitational slip. We compare these constraints with those achievable by current or near-future surveys such as DESI and Euclid, all under the same forecasting formalism, and compare our formalism with traditional linear methods. Our Python code FishLSS — used to calculate the Fisher information of the full shape power spectrum, CMB lensing, the cross-correlation of CMB lensing with galaxies, and combinations thereof — is publicly available.