Why does a unified force split to become two separate forces?
A) The universe expands so much that carrier particles become too dense.
B) The energy in the CBR becomes less than the mass of the unified force's carrier particles.
C) Dark energy becomes significant at later times and forces the two to split.
D) The spatial dimensions split and so must the forces.

Question

Quizplus · Accepted Answer

According to the theory of particle physics, during the early stages of the universe, all fundamental forces were unified into a single force. However, as the universe cooled and expanded, the energy in the cosmic background radiation (CBR) became less than the mass of the unified force's carrier particles. This caused the force to split into separate forces, with each having its own distinct carrier particle. This is known as symmetry breaking. Therefore, option B is the correct choice.

Why Does a Unified Force Split to Become Two Separate