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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 EndofChapter 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 OnLine 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 spacetime 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 SpaceTime 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 spacetime 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 spacetime 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 unflat now, or would have collapsed already 12...
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 Fall '11
 DavidToback

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