Question

Did before the big bang

Answer 1

Answer:

No one knows exactly what was happening in the universe until 1 second after the Big Bang, when the universe cooled off enough for protons and neutrons to collide and stick together. Many scientists do think that the universe went through a process of exponential expansion called inflation during that first second.

Answer 2

Answer:

1 second after the Big Bang, when the universe cooled off enough for protons and neutrons to collide and stick together.

• Many scientists do think that the universe went through a process of exponential expansion called inflation during that first second.
• Since events before the Big Bang have no observational consequences, one may as well cut them out of the theory and say that time began at the Big Bang .
• It's possible that before the Big Bang, the universe was an infinite stretch of an ultrahot, dense material, persisting in a steady state until, for some reason, the Big Bang occured. This extra-dense universe may have been governed by quantum mechanics, the physics of the extremely small scale .
• Stephen Hawking :-  Before the Big Bang events are unmeasurable, and thus undefined.
• Hawking called this the no-boundary proposal .
• Time and space  are finite, but they don’t have any boundaries or starting or ending points, the same way that the planet Earth is finite but has no edge.
• One idea is that the Big Bang isn't the beginning of time, but rather that it was a moment of symmetry. In this idea, prior to the Big Bang, there was another universe, identical to this one but with entropy increasing toward the past instead of toward the future.
• Increasing entropy, or increasing disorder in a system, is essentially the arrow of time , so in this mirror universe, time would run opposite to time in the modern universe and our universe would be in the past.

A related theory holds that the Big Bang wasn't the beginning of everything, but rather a moment in time when the universe switched from a period of contraction to a period of expansion.

     This "Big Bounce" notion suggests that there could be infinite Big Bangs as the universe expands, contracts and expands again.

      The problem with these ideas, Carroll said, is that there's no explanation for why or how an expanding universe would contract and return to a low-entropy state.

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