Chapter18 - Big Bang, Black Holes, No Math ASTR/PHYS 109...

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Big Bang, Black Holes, No Math Early Times & Fate of the Universe Topic 1: Possibilities 1 Big Bang, Black Holes, No Math ASTR/PHYS 109 Dr. David Toback Lectures 24
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Big Bang, Black Holes, No Math 2 Prep for Today (Is now due) – L24 Reading: BBBHNM 18 & 19 Reading questions: Chapter 18 & 19 End-of-Chapter Quizzes: Chapter 17 Paper Stuff Paper 1, 2 or 3: Misgraded? Let us know Paper 3 revision: Due Monday Paper 4: Due Monday (same format as last two papers)
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Big Bang, Black Holes, No Math 3 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… won’t take long
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Big Bang, Black Holes, No Math Early Times & Fate of the Universe Topic 1: Possibilities 4 Unit 6 Going back in time and going forward in time Before the first millionth of a second and the Fate of the Universe
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Big Bang, Black Holes, No Math Early Times & Fate of the Universe Topic 1: Possibilities 5 Overview of Section 6 The things that determine the Fate of the Universe are the dominant effects in the VERY early Universe Thus, to understand either requires learning about both
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Big Bang, Black Holes, No Math Early Times & Fate of the Universe Topic 1: Possibilities 6 Outline of Unit 6 1.Possible Fates of the Universe 2.Dark Matter 3.Particle Physics 4.Inflation 5.Dark Energy Today
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Big Bang, Black Holes, No Math Early Times & Fate of the Universe Topic 1: Possibilities 7 Caveats While the data is VERY powerful, many of the ideas are not fully “proven” Still need data to tell us about the theory, and theory to tell us about the data New data and theoretical advances have recently changed our understanding of the Universe
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Big Bang, Black Holes, No Math Early Times & Fate of the Universe Topic 1: Possibilities 8 The Fate of our Universe Will the Universe continue expanding forever? That depends, mostly, on a few things: 1. How fast is it expanding now 2. How much STUFF there is in the Universe 3. How big it is now 4. Are the laws of physics really understood?
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Big Bang, Black Holes, No Math Early Times & Fate of the Universe Topic 1: Possibilities 9 Why the first three are so important Gravity is trying to pull space- time back together again Attractive force Either it’s strong enough to pull it all back together again, or it isn’t
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Big Bang, Black Holes, No Math Early Times & Fate of the Universe Topic 1: Possibilities 10 What about that last issue? Dark Energy fits into this story, but it is an effect that only impacts on the largest scales Takes 10 billion years and HUGE distance scales to have ANY effect Start by discussing gravity first, then come back to it in Chapter 22
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Big Bang, Black Holes, No Math Early Times & Fate of the Universe Topic 1: Possibilities 11 Gravity: Three Possibilities There are basically three possibilities Use an analogy… Shooting a bullet into the air at the surface of the Earth
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This note was uploaded on 01/06/2012 for the course PHYS 109 taught by Professor Davidtoback during the Fall '11 term at Texas A&M.

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Chapter18 - Big Bang, Black Holes, No Math ASTR/PHYS 109...

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