A Big-Bang Timeline

t < 10-43 seconds
- “Planck Time” the shortest time we can know anything about in current physics
- We don’t know anything before this time.
t < 10-35 equilibrium between particles, antiparticles and photons.
- High energy photons decay into particle antiparticle pairs.
- Particle and antiparticle annihilate to create high energy photons
- Symmetry between particles and antiparticles (same number of each).

t < 10-43 seconds