1. Lecture 26 Very Early Universe ASTR 340 Fall 2006 Dennis Papadopoulos

2. Current Status of Cosmology

3. Inflation Inflation started at 10 -34 seconds and during the next 10 -37 seconds the Universe expanded by a factor 10 50 Why we need inflation?

4. Problems with Standard Model

5. Flatness

6. Horizon Problem

9. Structure Problem

11. The Relic Problem

13. The Antimatter Problem

14. Forces Range and Strength

15. Exchange Particle Forces Virtual Particles Mediate Force Pi-meson m=10 -28 kg

16. Two electrons colliding exchange photons Neutron decay mediated by a vector boson W -

18. Four known forces in universe: Strong Force Electromagnetism Weak Force Gravity

19. Four known forces in universe: Strong Force Electromagnetism Weak Force Gravity Do forces unify at high temperatures?

20. Four known forces in universe: Strong Force Electromagnetism Weak Force Gravity Do forces unify at high temperatures? Yes! (Electroweak)

21. Four known forces in universe: Strong Force Electromagnetism Weak Force Gravity Do forces unify at high temperatures? Yes! (Electroweak) Maybe (GUT)

22. Four known forces in universe: Strong Force Electromagnetism Weak Force Gravity Do forces unify at high temperatures? Yes! (Electroweak) Maybe (GUT) Who knows? (String Theory)

23. Universe Timeline

24. Creation of Matter

26. Forces

34. Cosmology in Crisis

37. The Future?

38. Planck Era Before Planck time (~10 -43 sec) No theory of quantum gravity

39. Need for a Beginning