1 / 43

The Cosmic Microwave Background (CMB): The Edge of the observable universe

The Cosmic Microwave Background (CMB): The Edge of the observable universe. Time. The History of the Universe. Start of the era of transparency (“surface of last scattering” or “edge of the observable universe”). High Energy & Temp. The Edge of the Observable Universe:

rufin
Download Presentation

The Cosmic Microwave Background (CMB): The Edge of the observable universe

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The Cosmic Microwave Background (CMB): The Edge of the observable universe

  2. Time The History of the Universe Start of the era of transparency (“surface of last scattering” or “edge of the observable universe”) High Energy & Temp

  3. The Edge of the Observable Universe: As we look back in space we look back in time. We see: Light traveling from far away =from distant past Here & Now Long ago (about 14 Billion years) the Universe was so hot and dense it was opaque: The edge of the observable universe

  4. Properties of the Edge of the Observable Universe: Similar to surface of Sun at time of emission • Today: • Only 2.726K above absolute Zero • “Microwave Radiation” (The “Cosmic Microwave Background”: CMB) • 1,000,000 times weaker than ambient radiation in a pitch dark room. Here & Now

  5. CMB Temperature smooth to 3 Decimal places Red shifted CMB “dipole” (at the 0.1% level) Blue shifted Interpret CMB dipole as red/blue shits due to our motion and remove to get “cosmic anisotropies” Galaxy

  6. A modern map of the “edge of the observable universe: The cosmic microwave background or CMB

  7. Time The History of the Universe New Image of the “Last Scattering Surface” from NASA’s WMAP satellite released Feb 11 2003 High Energy & Temp

  8. WMAP map of the “edge of the observable universe” plotted as a sphere

  9. Note: we are really on the inside looking out WMAP map of the “edge of the observable universe” plotted as a sphere

  10. Discuss surface of last scattering at the board.

  11. The edge of the observable universe (from the COBE satellite) The Galaxy Temperature fluctuations (one part in 100,000)

  12. The globe (using the same projection as COBE)

  13. The globe viewed with COBE resolution (7 degrees)

  14. The globe with COBE-style noise

  15. The globe after simulated COBE data analysis

  16. CMB Temperature smooth to 3 Decimal places Red shifted CMB “dipole” (at the 0.1% level) Blue shifted Interpret CMB dipole as red/blue shits due to our motion and remove to get “cosmic anisotropies” Galaxy

  17. COBE 4yr data with galaxy removed

  18. Some Ground-based CMB Experiments

  19. Mapping the Microwave Sky from the ground BOOMERANG

  20. NASA’s MAP(Microwave Anisotropy Probe) -Launched June 30 ’01 -Reached “L2” Oct 1 ’01 -April 1 ’02 First scanning of entire sky complete

  21. Observing the Microwave Background, Past, present and future:

  22. The WMAP map

  23. WMAP map of the “edge of the observable universe” plotted as a sphere

  24. Note: we are really on the inside looking out WMAP map of the “edge of the observable universe” plotted as a sphere

  25. Using CMB data to learn about the universe

  26. Using the CMB to learn about the Universe Amount of “blobs” Size of blob (small ==>) solid=inflation model dashed=defect models (magenta=desperate attempt to produce sharp peak)

  27. WMAP • Characteristic oscillations in the CMB power Inflation Temperature Power  “Active” models Adapted from Bennett et al Feb 11 ‘03  Angular scale I.1 Successes

  28. NASA’s WMAP(Microwave Anisotropy Probe) -Launched June 30 ’01 -Reached “L2” Oct 1 ‘01

  29. WMAP • Characteristic oscillations in the CMB power Inflation Temperature Power  “Active” models Adapted from Bennett et al Feb 11 ‘03  Angular scale I.1 Successes

  30. Maps of the microwave sky (the “edge of the observable universe”) Real 1993 2009 Simulated 2003 Simulated

  31. Maps of the microwave sky (the “edge of the observable universe”) Real 1993 Updated after WMAP announcement, Feb 2003 2009 Real Data! 2003 Simulated

  32. Maps of the microwave sky (the “edge of the observable universe”) Real 1993 Updated after WMAP announcement, Feb 2003 2009 Real Data! 2006 Simulated

  33. WMAP 3-yr map

  34. WMAP 5-yr map

  35. Cosmic acceleration Using supernovae (exploding stars) as cosmic “mileposts”, acceleration of the Universe has been detected. Preferred by modern data  Amount of “antigravity” matter “Ordinary” non accelerating matter Supernova  Amount of ordinary matter

  36. Cosmic acceleration Using supernovae (exploding stars) as cosmic “mileposts”, acceleration of the Universe has been detected. Preferred by modern data  Amount of “antigravity” matter “Ordinary” non accelerating matter Supernova  Amount of ordinary matter

  37. Cosmic acceleration Accelerating matter is required to fit current data Preferred by data c. 2003  Amount of w=-1 matter (“Dark energy”) “Ordinary” non accelerating matter Supernova  Amount of “ordinary” gravitating matter

  38. Cosmic acceleration Accelerating matter is required to fit current data Kowalski, et al., Ap.J.. (2008) Preferred by data c.2008  Amount of w=-1 matter (“Dark energy”) “Ordinary” non accelerating matter BAO Supernova  Amount of “ordinary” gravitating matter

More Related