Gravity becomes separate from the other forces at the:
A) decoupling Event, about a million years after the Big Bang.
B) end of the Planck Era, about 10⁻⁴³ seconds after the Big Bang.
C) end of the Inflationary Epoch, about 10⁻³² seconds into creation.
D) beginning of particle production, about .0001 seconds into the universe.
E) end of electron production, about a minute after creation.

Question

Quizplus · Accepted Answer

At the end of the Planck Era, the universe was still under conditions of extreme density and temperature where the four fundamental forces including gravity were unified. As the universe continued to expand and cool, the other three forces (strong nuclear, weak nuclear, and electromagnetic) became distinct while gravity remained unified until the decoupling event. Therefore, gravity became separate from the other forces at the end of the Planck Era, about 10⁻⁴³ seconds after the Big Bang.

Gravity Becomes Separate from the Other Forces at The