Chapter21 - 1 Big Bang, Black Holes, No Math Early Times...

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Unformatted text preview: 1 Big Bang, Black Holes, No Math Early Times & Fate of The Universe Topic 4: Inflation Big Bang, Black Holes, No Math ASTR/PHYS 109 Dr. David Toback Lecture 26 2 Prep for Today (Is now due) L26 Reading: BBBHNM 22 Reading questions: Chapter 22 End-of-Chapter Quizzes: Chapter 20 Paper Stuff Paper 1, 2 or 3: Misgraded? Let us know Paper 3 revision: CPR due Monday Paper 4: CPR due Monday Papers & End of Semester Last day of class Cancelled the last paper Paper 4: CPR due on Monday (no class, attend Friday class) Will finish grades shortly after that Let us know if you see problems Only doing text revisions: Email ASAP to be considered Honors papers: Due tonight at midnight if you want to do a revision You can turn it in on Monday, but with no chance for revision End of Chapter quizzes for all chapters due Monday Cant pass the course without them 3 4 Course Evaluations Course evaluations will be done online via the Department of Physics On-Line Course Evaluation System You should have gotten an email about this already The Fall 2011 evaluation period will: Began on November 18 Ends on Friday, December 23 at 8AM Please do these ASAP wont take long Interested in learning more next semester? Take Astronomy 111 5 6 Big Bang, Black Holes, No Math Early Times & Fate of The Universe Topic 4: Inflation Unit 6 Going back in time and going forward in time Before the first millionth of a second and the Fate of the Universe 7 Outline of Unit 6 1.Possible Fates of the Universe 2.Dark Matter 3.Particle Physics 4.Inflation 5.Dark Energy Today 8 Big Bang, Black Holes, No Math Early Times & Fate of The Universe Topic 4: Inflation Todays Outline Two pieces of evidence: 1. A Universe with the Critical Density and a Flat space-time 2. A Universe where the Temperature is the same in all directions Why these are unexpected Inflation in the VERY early Universe 9 Big Bang, Black Holes, No Math Early Times & Fate of The Universe Topic 4: Inflation Density of the Universe and General Relativity General Relativity teaches us that the Density of the Universe determines the Curvature of Space-Time Remember, were not talking about local curvature, but the curvature of the entire universe 10 Big Bang, Black Holes, No Math Early Times & Fate of The Universe Topic 4: Inflation Critical Universe Flat Space Time Crunch Critical Forever? Data points to a Universe with the critical density and flat space-time The Data 11 Big Bang, Black Holes, No Math Early Times & Fate of The Universe Topic 4: Inflation Flatness and General Relativity General Relativity tells what the Bang must have been like to evolve into something that gives a flat space-time AND has the speed we observe This isnt a problem BUT it also tells us that if the Universe were slightly different from that at the beginning it would become VERY un-flat now, or would have collapsed already 12...
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Chapter21 - 1 Big Bang, Black Holes, No Math Early Times...

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