When the Big Bang began, all the fundamental forces were unified and behaved like a single force. As the universe expanded and cooled during the Big Bang, when did gravity first become a separate force? A) at the start of quark confinement, when the universe was about 10^-6 s old B) at the start of the inflationary period, when the universe was about 10^-35 s old C) at the end of the inflationary period, when the universe was about 10^-33 s old D) at the Planck time, when the universe was about 10^-43 s old

Question

Quizplus · Accepted Answer

Gravity is believed to have separated from the unified forces at the Planck time, approximately 10^-43 seconds after the Big Bang, marking the earliest phase of the universe where classical physics begins to apply.

When the Big Bang Began, All the Fundamental Forces Were