The effective field theory of large-scale structure and multi-tracer

Author(s)

Mergulhao, Thiago ; Rubira, Henrique ; Voivodic, Rodrigo ; Raul Abramo, L.

• Document type: Journal article
• Source: Journal of Cosmology and Astroparticle Physics; v. N/A, n. 4, p. 34-pg., 2022-04-01.

Abstract

We study the performance of the perturbative bias expansion when combined with the multi-tracer technique, and their impact on the extraction of cosmological parameters. We consider two populations of tracers of large-scale structure and perform a series of Markov chain Monte Carlo analysis for those two tracers separately. The constraints in omega(cdm) and h using multi-tracer are less biased and approximately 60% better than those obtained for a single tracer. The multi-tracer approach also provides stronger constraints on the bias expansion parameters, breaking degeneracies between them and with their error being typically half of the single-tracer case. Finally, we studied the impacts caused in parameter extraction when including a correlation between the stochastic field of distinct tracers. We also include a study with galaxies showing that multi-tracer still lead to substantial gains in the cosmological parameters. (AU)

• FAPESP's process: 16/19647-2 - Constraining modified gravity theories with void properties
• Grantee: Rodrigo Voivodic
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 19/26492-3 - Science with the Brazilian robotic telescope
• Grantee: Claudia Lucia Mendes de Oliveira
• Support Opportunities: Special Projects