how many universes are there, anyway

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http://timeandquantummechanics.com Multiverse - Balticon, May 23rd, 2015 John Ashmead Anyway? Just how many universes are there,

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  1. 1. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015John Ashmead Anyway? Just how many universes are there,
  2. 2. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 Rainbow gravity Gravity leaking into nearby dimensions Miniature black holes
  3. 3. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 The multiverse today The problem of ne-tuning A scientic hypothesis? What are the odds?
  4. 4. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 The Multiverse Today A brief history of the multiverse The edge of the known From the Big Bang to now
  5. 5. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 A brief history of the Multiverse Eratotheness Earth Keplers Moon Galileos Jupiter Wrights Galaxies Bessels Star
  6. 6. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 Chief Librarian at Alexandria at 245 BC Sieve of primes Beta/Pentathelete Camel-Days Right order of magnitude Eratothenes Earth
  7. 7. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 Keplers Somnium (1608+) Autobiographical Revised thru his life Copernican theory The view from the moon
  8. 8. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 Careful reasoning Notebooks Time series A lot to love here Galileo & The Moons of Jupiter(1610)
  9. 9. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 Wrights Galaxies (1750) Milky way as galaxy Nebulae as galaxies An indifferent universe
  10. 10. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 Bessels Star (1838)
  11. 11. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 Cosmic Distance Ladder Parallax (Blue) Standard Candles (Light Orange) Supernovae (Red) The red shift (Dull green)
  12. 12. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015
  13. 13. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 30 billion years away But only 13.7 billion years since start? Space has been expanding!
  14. 14. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 Finite but no edge! Finite but no edge Its getting bigger every minute Now is a good time for observers
  15. 15. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 Big Bang Theory (De Luce) Only theory with a TV show Robert Grossteste, 1175 - 1253. The Big Bang theory is not about the Big Bang
  16. 16. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 Why is the universe so at? With matching temperature & curvature?
  17. 17. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 Too Hot to Shine Only ionized particles The unfortunate photon no sooner escapes from one particle Than it is absorbed by another!
  18. 18. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 Tri-Alpha Process Helium stable Beryllium (next) is NOT But there is a resonance with Carbon Tunnel thru!
  19. 19. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 The problem of fine- tuning Just six numbers Quantum uctuations String theory
  20. 20. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015
  21. 21. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 Anthropic testsCurious when you think about it that the universe is perfectly adapted for velociraptors What if there are lots of universes & we just got lucky? I see dinner!
  22. 22. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 Vulcan Science Directorate Thinks not A parallel universe. The science directorate has examined all these theories. They've found no evidence of alternate realities.
  23. 23. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 Quantum Fluctuations Quantum uctuations Fractals Led to universe And galaxies
  24. 24. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 Eternal Inflation Parts of the mega universe suddenly cool out Creating a bubble universe That inates with specic values of the fundamental physical constants
  25. 25. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 Live, Die, Repeat Origin of species Generate & test Galaxies, stars, planets, & us Universes & their observers And theories of the multiverse, e.g. String Theory
  26. 26. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 String theory Most popular today Gets rid of some innities Lets us combine particle physics & gravity 10 dimensions for superstrings
  27. 27. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 Compactification
  28. 28. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 Calabi-Yau Manifolds The extra dimensions are curled up into complex structures Many possible ways to do this
  29. 29. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 String-scape 10^500 possibilities Most are uninteresting A few Happy Valleys
  30. 30. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 Fringe Science? Hot scientists? Equations? Intense but puzzled expressions? Fate of the universe at stake?
  31. 31. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 How to think about WeirdThings Testability Fruitfulness Scope Simplicity Conservatism
  32. 32. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 Testability
  33. 33. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 Cosmological Microwave Background
  34. 34. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 Bubble universes
  35. 35. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 Bubbles in the CMB? Nearby parallel universe Leaves smudge on the CMB Sister universes?
  36. 36. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 Gravitational waves Distant universes Remnants of collisions From before the Big Bang
  37. 37. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 Fruitfulness Gives you something to look for at small scales And at large Can rock the mind loose from hard- wired assumptions
  38. 38. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 Scope Largest possible scope See as far as possible And then drive imagination a bit further than that
  39. 39. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 Simplicity # of hypotheses not number of parts, but the kinds of parts is a Calabi-Yau manifold simple or complex?
  40. 40. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 Wheelers Radical Conservatism The combination of Eternal Ination & String theory gives the multiverse as a straight forward prediction Gellmanns totalitarian principle + the 30 odd constants also imply multiverse And Many Worlds Interpretation implies that the multiverse a natural implication of quantum mechanics
  41. 41. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015
  42. 42. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 The universe whisperer
  43. 43. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 Shift your assumptions to match those of your target world Absurd And profound Syllogismobile
  44. 44. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 one universe or many?
  45. 45. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 Thanks! Balticon & Miriam Kelly Ferne Welch Brenda Welch & Jamie Laird Other quasi-willing ears
  46. 46. http://timeandquantummechanics.comMultiverse - Balticon, May 23rd, 2015 Stenger - God & the Multiverse - 2014 Greene - Hidden Reality - 2011 Barrow - The Book of Universes - 2011 Clegg - Before the Big Bang - 2009 Susskind - The Cosmic Landscape - 2006