Cosmological piecewise functions to treat the local Hubble tension

The current cosmic time evolution of the Universe is described by the General Theory of Relativity when a cosmological principle is considered under a flat space time landscape. The set of known as Friedmann equations, contain the principles that lead to the construction of the standard Lambda CDM model. However, the current state-of-art regarding these equations, even if it is a fundamental method, is based in solving analytically the differential equations by considering several forms of matter/energy components or evaluating them in specific cosmic times where two or more components contribute at the same rate. This latter can be carry out through the approach of piecewise solutions, whose reduce the numerical integrals. In this paper we discuss new solutions through special analytical functions and constraint them with an updated compilation of observational Hubble observations in order to deal with the local H-0 tension reported.

Automated summary

This paper discusses new solutions obtained through special analytical functions for solving the Friedmann equations, and constrains them with an updated compilation of observational Hubble data to address the issue of local H-0 tension.