Dear Mr. Hoang cao Hai,
Thank you for your nice question.
Well, the existence of Time is linked to the existence of Space and gravity (Please see also chapter three of my Essay and the comment to Mr. Maguire above.)
That means before the gravitational force split off from the primal force at an Energy level of 10 high15GeV (according to G.U.T.) was no time in our space bubble. Because the gravity was formend at this level of energy. You see, there are two Important moments in Theory of Big Bang according to G.U.T. The first, the Big Bang started at a level of energy around 10 high 19GeV and the space was formed, as the first prereqisite exists. The second, is the split off the gravity. In this moment the second prereqisite of time exists. Finally the time came in our cosmic Space bubble at this moment (Energy Level: 10 high 15GeV). That means the time did not started at big bang. The time starts totgehet with the existence of gravity.
The space had the opportunity for an extremly rush expansion, the so called cosmic Inflation. Because velocity is the quotient of distance and time. But there is no Time, there is also no velocity. That means every point can be achived instantaneously.
The Concept of "thermodynamic time arrow" supports also my Concept of Time. Our Space bubble is closed system and therefore the Second Low of Thermodynamic is valid. The Big Bang started with a very High entropy (Fluctuation of quantas due to a High mess, or better entropy. During the cosmic inflation the energy inside our cosmic bubble will be equal spread over the Volume of our Space bubble. That means in the moment of inflation Stops and the time Starts, in this Moment the entropy is very low. By the next steps of development our cosmic Space bubble the entropy is increasing according to the second low of thermodynamic and also the time Runs from history into the future.
What do you think? Some silly ideas?
Best regards
Kai