How did the universe look 1 second after the creation? Flatness and horizon problem

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For decades, inflation has been the dominant cosmological scenario, but recently the theory has been subject to competition and critique. Two renowned pioneers of inflation -- Alan Guth and Andrei Linde -- join Brian Greene to make their strongest case for the inflationary theory.

 

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I've read a fair amount from Alan Guth over the years, and he makes a good case for the Big Bang/Expansion theory. Which of course requires no supernatural explanation for the origin of the universe and the mass/energy therein.