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The proposal "no boundary" of physicists Hartle and Hawking seeks to build asatisfactory model of the early Universe, in a way that avoids the singularity"Big Bang" of the beginning of the Universe. As a consequence of this proposal,the concept of metric signature change arises, which is approached in differentways in the literature. Here, we reinterpret the Mansouri-Nozari approach,which modifies the FLRW metric, and uses the formalism of Colombeau's Algebras,to develop its equations. In addition, we write the function that changes thesign in terms of redshift. Finally, we developed Friedmann's equations, of themodified metric, as well as the equation of state and other relevant equationsin Cosmology.

An Approach to the Primordial Universe Using Colombeau's Simplified Algebra