Lecture24 - Big Bang, Black Holes, No Math No ASTR/PHYS 109...

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Big Bang, Black oles No Math Holes, No Math STR/PHYS 109 ASTR/PHYS 109 r David Toback Dr. David Toback ectures 4 Big Bang, Black Holes, No Math Early Times & Fate of the Universe Topic 1: Possibilities 1 Lectures 24
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Prep for Today (Is now due) – L24 Reading: BBBHNM 18 & 19 HNM & 9 Reading questions: Chapter 18 & 19 End-of-Chapter Quizzes: Chapter 17 hapt r 7 Paper Stuff Paper 1, 2 or 3: Misgraded? Let us know Paper 3 revision: Due Monday Paper 4: Due Monday (same format as last wo papers) Big Bang, Black Holes, No Math 2 two papers)
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Course Evaluations Course evaluations will be done online via e epartment f Physics On- ine the Department of Physics On Line Course Evaluation System You should have gotten an email about this already he all 2011 evaluation period ill: The Fall 2011 evaluation period will: Began on November 18 nds on Friday ecember 23 t AM Ends on Friday, December 23 at 8AM Please do these ASAP… won’t take long Big Bang, Black Holes, No Math 3
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Unit 6 Going back in time and going forward in time Before the first millionth of a second and the Fate of the Universe Big Bang, Black Holes, No Math Early Times & Fate of the Universe Topic 1: Possibilities 4
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Overview of Section 6 The things that determine the Fate of the Universe are the ominant effects in the ERY dominant effects in the VERY early Universe Thus, to understand either requires learning about both Big Bang, Black Holes, No Math Early Times & Fate of the Universe Topic 1: Possibilities 5
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Outline of Unit 6 1.Possible Fates of the Today Universe 2.Dark Matter article Physics 3.Particle Physics 4.Inflation . nf at on 5.Dark Energy Big Bang, Black Holes, No Math Early Times & Fate of the Universe Topic 1: Possibilities 6
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Caveats While the data is VERY powerful, many of the ideas are not fully “proven” Still need data to tell us about the eory and theory to tell us about theory, and theory to tell us about the data New data and theoretical advances have recently changed our Big Bang, Black Holes, No Math Early Times & Fate of the Universe Topic 1: Possibilities 7 understanding of the Universe
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The Fate of our Universe Will the Universe continue expanding forever? That depends, mostly, on a few ings: things: 1. How fast is it expanding now ow much STUFF there is in 2. How much STUFF there is in the Universe ow big it is now 3. How big it is now 4. Are the laws of physics really Big Bang, Black Holes, No Math Early Times & Fate of the Universe Topic 1: Possibilities 8 understood?
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Why the first three are so important Gravity is trying to pull space-time back together gain again ttractive force Attractive force Either it’s strong enough to pull it all back together gain or it isn’t Big Bang, Black Holes, No Math Early Times & Fate of the Universe Topic 1: Possibilities 9 again, or it isn t
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Lecture24 - Big Bang, Black Holes, No Math No ASTR/PHYS 109...

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