We would observe two universes, one an antimatter reflection of the other. There

Question

We would observe two universes, one an antimatter reflection of the other. There would be no universe, because all of the matter and antimatter would have been annihilated. d. There would be a universe devoid of matter, entirely composed of photons. e. It would look similar to our universe, but the charges of all of the particles would be reversed. What is the Planck era? a. the earliest moments after the Big Bang. b. a period when quantum mechanics is needed to describe both spacetime and particles c. the time period when a theory of everything (TOE) is needed to understand the universe d. when spacetime can be described as a quantum mechanical "foam" rather than a smooth sheet e. all of the above As the universe cooled shortly after the Big Bang, which was the first fundamental force to separate itself out from the other? a. electromagnetism b. gravity c. the nuclear force d. the strong force e. the weak force

Explanation / Answer

21] Planck era is the short time elapsed just after the big bang which is of the order of 10-43 seconds. During this time, all the forces were possibly unified and there comes a need to describe the state of particles and space hosting them using quantum mechanics.

Hence the answer is all of the above [e].

22] Just after the big bang, gravity was the first one to break the symmetry and separated from the unified force.

Hence the answer is b.

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