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When was stabilized the amount of matter and energy in the universe?

dapifo
in Astronomy and Cosmology

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In the Big Bang was created matter and energy out of nothing.

 

It is assumed that currently the amount of energy+matter is constant, and that expands isotropically...only by the spacing of matter between them?

 

Then... at what moment after the Big-Bang was stabilized the amount of matter and energy in the universe?

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Are mainstream sure that the matter+energy of Our Universe is constant since 10^-32 sec after Big-Bang?

 

Is it not possible that some matter+energy comes in or goes out (enter or leave) of Our Universe?

 

Or matter+energy will be created new (as in the Big-Bang), or destroyed due to the same effect than matter-antimatter?... Does it goes against the Laws of Termodinamic?

Standard theory has the sum of matter and energy constant. Matter-antimatter annhilation leads to an equivalent amount of energy.

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Which % of antimatter there are in the Universe?...Is it constant also?

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