"Lec 20 - Dark Matter" Frontiers/Controversies in Astrophysics (ASTR 160) This lecture introduces an important concept related to the past and future of the universe: the Scale factor, which is a function of time. With reference to a graph whose coordinates are the Scale factor and time, the problem of dark matter is addressed again. Cosmological redshifts are measured to determine the scale of the universe. The discovery of the repulsive, anti-gravitational force of dark energy is explained. The lecture concludes with discussion of Einstein's biggest mistake: the invention of the cosmological constant to balance gravity. 00:00 - Chapter 1. The Scale Factor 04:41 - Chapter 2. Accounting for Dark Matter in Mass of Universe 27:58 - Chapter 3. Discovery of Dark Energy 42:06 - Chapter 4. Understanding Dark Energy and Einstein's Biggest Mistake Complete course materials are available at the Open Yale Courses website: http://open.yale.edu/courses This course was recorded in Spring 2007.
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Tags: anti-gravity constant cosmological redshift critical density dark energy matter distance modulus Hubble luminosity normalizing Omega scale factor standard candle Type Ia Supernova vacuum
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Duration: 49m 37s
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Lec 1- Introduction to Frontiers Controversies in Astrophysics
Lec 3 - Our Solar System and the Pluto Problem
Lec 4 - Discovering Exoplanets: Hot Jupiters
Lec 6 - Microlensing, Astrometry and Other Methods
Lec 7 - Direct Imaging of Exoplanets
Lec 8 - Introduction to Black Holes
Lec 9 - Special and General Relativity
Lec 11 - Special and General Relativity (cont.)
Lec 12 - Stellar Mass Black Holes
Lec 13 - Stellar Mass Black Holes (cont.)
Lec 15 - Supermassive Black Holes
Lec 16 - Hubble's Law and the Big Bang
Lec 17 - Hubble's Law and the Big Bang (cont.)
Lec 18- Hubble's Law and the Big Bang (cont.)
Lec 19 - Omega and the End of the Universe
Lec 21 - Dark Energy and the Accelerating Universe and the Big Rip
Lec 23 - Other Constraints: The Cosmic Microwave Background