New to this tour in physics? Start at THE BIG BANG.
“In physical cosmology, the Planck epoch (or Planck era) is the earliest period of time in the history of the universe, from zero to approximately 10−43 seconds (Planck time).
It is believed that, due to the extraordinarily small scale of the universe at the time, quantum effects of gravity dominated physical interactions.
During this period approximately 13.8 billion years ago gravitation is believed to have been as strong as the other fundamental forces, and all the forces may have been unified.
Inconceivably hot and dense, the state of the universe during the Planck epoch was unstable, tending to evolve, giving rise to the familiar manifestations of the fundamental forces through a process known as symmetry breaking. This has also been theorized to be the earliest moment of time that can be meaningfully described.”
Next lecture THE QUARK SOUP