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Olber’s Paradox

Olber’s Paradox. Uniform Expansion. Cosmological Redshift. Expansion Redshift. Cosmological Principle. Universality – The laws of nature are the same everywhere Homogeneity – The distribution of matter and energy is uniform at the largest scales

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Olber’s Paradox

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  1. Olber’s Paradox

  2. Uniform Expansion

  3. Cosmological Redshift

  4. Expansion Redshift

  5. Cosmological Principle • Universality – The laws of nature are the same everywhere • Homogeneity – The distribution of matter and energy is uniform at the largest scales • Isotropy – The distribution of matter and energy is the same in every direction

  6. Homogeneous and Isotropic ?

  7. Distribution of Galaxies

  8. Curved ant space

  9. Geodesics (great circles)

  10. Great Circles

  11. Open, Closed and Flat Spaces

  12. Dark Matter • Whether our universe is closed, open or flat is determined by the density of matter and energy. • Supercritical Density – Closed Universe • Critical Density – Flat Universe • Subcritical Density – Open Universe • Universe appears close to flat but density of luminous matter is no where near critical

  13. Dark Matter Candidates • MACHO – Massive And Compact Halo Objects – lots of mini black holes everywhere • WIMP – Weakly Interacting Massive Particles – massive neutrinos or undiscovered particles

  14. Three possible Histories

  15. Accelerating Expansion

  16. Thermal History

  17. A brief History

  18. Temperature v. Time

  19. Unification of Forces

  20. Era of creation/annihilation

  21. Helium Synthesis

  22. He synthesis in detail

  23. Recombination(cosmic microwave background)

  24. Cosmic Microwave Background

  25. CMB temp (0 to 4 K)

  26. CMB temp (2.724 to 2.732 K)

  27. CMB temp (2.7279 to 2.7281 K)peculiar motion subtracted

  28. Why is CMB uniform ?

  29. Causal Connection

  30. Inflation

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