In less than 100 seconds, Andrew Jaffe explains why cosmologists believe that the universe underwent a period of vast and rapid growth when it was just fractions of a second old.
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James B Hartle, S W Hawking and Thomas Hertog 2014 JCAP 01 015Read on IOPscience
Stephen Hawking et al 2001 JHEP 05 001Read on IOPscience