THESEUS$-$BTA cosmological tests using Multimessenger Gamma-Ray Bursts observations

TL;DR

This paper reviews how multimessenger gamma-ray burst observations, especially from the THESEUS-BTA program, can test fundamental cosmological principles and address discrepancies in parameter measurements across different scales.

Contribution

It introduces the potential of multimessenger gamma-ray burst observations for testing core cosmological models and discusses systematic effects influencing these tests.

Findings

Multimessenger GRB observations can probe cosmological models up to redshift z~10.

Selection effects significantly impact the interpretation of cosmological relations.

THESEUS-BTA program aims to enhance these tests with future observations.

Abstract

Modern Multimessenger Astronomy is a powerful instrument for performing cosmological crucial tests of the Standard Cosmological Model in the wide redshift interval up to $z \sim 10$. This is principally important for discussion related to discrepancies between local and global measurements of cosmological parameters. We present a review of multimessenger gamma-ray burst observations currently conducted and planed for THESEUS$-$BTA cooperative program. Such observations give a unique opportunity to test the fundamental foundations of cosmological models: gravitation theory; cosmological principle of homogeneity and isotropy of large-scale distribution of matter; and space expansion paradigm. Important role of various selection effects leading to systematic distortions of true cosmological relations is discussed.