1. The Multiverse Our Universe and others

2. Our Early Universe Universe described by three numbers: Omega gravity vs. expansion; Ratio of baryons to bosons (matter to energy); ‘Q’ the amplitude of primordial ripples.

3. Omega Critical Mass : Actual Mass Matter we can see e.g. stars, galaxies Dark Matter e.g. brown dwarfs, neutrinos

4. Matter Andrei Sakharov claimed that Proton abundance is allowed if: Baryon number is not conserved; Cosmic expansion is very fast; Matter/Antimatter reactions not time- reversible, the direction of time is sensed thanks to expansion.

5. Primordial Ripples The Universe is almost totally smooth. However, there are slight discrepancies in the densities of matter in certain areas. At time of the last scattering surface the Universe was about 3000 o K. Q≈1x10 -5

6. Other important constants Lambda – the energy density of empty space: dark energy.

7. What if these values were different?

8. The Multiverse A collection of every possible Universe. Archipelagos of life-supporting Universes. Anthropic Reasoning: Our Universe is the BEST (or most well suited to life) out of all other infinite possibilities.

9. Different Universes Infinite possibilities. As computing power increases more adventurous models will be made. Small tweaks at present time, later greater changes

10. Why Bother? Helps us understand the workings of our own Universe. May aid us in our search for the final theory of everything. Curiosity.

11. Any Questions?