Hi Branko.
Could you write your theory, that we may discuss about it ?
The Big Bang theory is not completed yet, there are some doubts still.

What do you mean to “gravitons”?
How are the hydrogen clouds created ?
How is the matter created from energy ?
I have some of this problems in my web site, if you have time - http://bencieszyn.w.interia.pl/antimatter/...matter-ang.html