Forward modeling of a multi-tracer cosmological survey

• Grant number: 19/01631-0
• Support Opportunities: Scholarships in Brazil - Master
• Start date: May 01, 2019
• End date: June 04, 2021
• Field of knowledge: Physical Sciences and Mathematics - Astronomy - Extragalactic Astrophysics
• Principal Investigator: Luis Raul Weber Abramo
• Grantee: Francisco Germano Maion
• Host Institution: Instituto de Física (IF). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

The great question of modern cosmology is the source of cosmic acceleration: is it some new form of matter/energy, called dark energy? Or is it due to some modification in the laws of gravity? The large investment in new astronomical instruments has been fueling a dramatic growth in the quantity and quality of cosmological data. However, the richness and complexity of that data demands new ideas, tools and methods with which we can extract meaningful information from the observations. The goal of this project is to perform the forward modeling of a cosmological survey, from the basic properties of the galaxy catalog to the extraction of cosmological parameters from multiple populations of different tracers of large-scale structure. This effort will take into account mainly the uncertainties in the selection and classification of objects (star/galaxy/quasar separation), in the photometric redshifts (for imaging surveys), and in the selection function. The main application will be for the J-PAS survey, which depends on ``pseudo-spectra'' (imaging in narrow-band filters) in order to classify objects and to obtain estimates of the redshifts. This new type of data means that J-PAS will deliver a catalog of probabilities that each individual object is of a certain type, and within each type, a probability distribution function for its photometric redshift. The consequences of such a new dataset for cosmology are unknown -- and this is what we want to explore, in particular as it pertains the detection of baryon acoustic oscillations and redshift-space distortions.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

MAION, FRANCISCO; ANGULO, RAUL E.; ZENNARO, MATTEO. Statistics of biased tracers in variance-suppressed simulations. Journal of Cosmology and Astroparticle Physics, v. N/A, n. 10, p. 27-pg., 2022-10-01. (19/01631-0)

ZENNARO, MATTEO; ANGULO, RAUL E.; CONTRERAS, SERGIO; PELLEJERO-IBANEZ, MARCOS; MAION, FRANCISCO. Priors on Lagrangian bias parameters from galaxy formation modelling. Monthly Notices of the Royal Astronomical Society, v. 514, n. 4, p. 14-pg., 2022-07-09. (19/01631-0)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

MAION, Francisco Germano. Statistical and Numerical Methods for Precision Cosmology. 2021. Master's Dissertation - Universidade de São Paulo (USP). Instituto de Física (IF/SBI) São Paulo.