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ASTR 160 - Frontiers and Controversies in Astrophysics

Lecture 20 - Dark Matter. 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. (from oyc.yale.edu)

Lecture 20 - Dark Matter

Time Lecture Chapters
[00:00:00] 1. The Scale Factor
[00:04:41] 2. Accounting for Dark Matter in Mass of Universe
[00:27:58] 3. Discovery of Dark Energy
[00:42:06] 4. Understanding Dark Energy and Einstein's Biggest Mistake

References
ASTR 160: Lecture 20 - Dark Matter
Instructor: Professor Charles Bailyn. Class Notes Lecture 20 [pdf]. Problem Set 7 and Solutions [pdf]. Transcript [html]. Audio [mp3]. Download Video [mov].

Go to the Course Home or watch other lectures:

Lecture 01 - Introduction
Lecture 02 - Planetary Orbits
Lecture 03 - Our Solar System and the Pluto Problem
Lecture 04 - Discovering Exoplanets: Hot Jupiters
Lecture 05 - Planetary Transits
Lecture 06 - Microlensing, Astrometry and Other Methods
Lecture 07 - Direct Imaging of Exoplanets
Lecture 08 - Introduction to Black Holes
Lecture 09 - Special and General Relativity
Lecture 10 - Tests of Relativity
Lecture 11 - Special and General Relativity (cont.)
Lecture 12 - Stellar Mass Black Holes
Lecture 13 - Stellar Mass Black Holes (cont.)
Lecture 14 - Pulsars
Lecture 15 - Supermassive Black Holes
Lecture 16 - Hubble's Law and the Big Bang
Lecture 17 - Hubble's Law and the Big Bang (cont.)
Lecture 18 - Hubble's Law and the Big Bang (cont.)
Lecture 19 - Omega and the End of the Universe
Lecture 20 - Dark Matter
Lecture 21 - Dark Energy and the Accelerating Universe and the Big Rip
Lecture 22 - Supernovae
Lecture 23 - Other Constraints: The Cosmic Microwave Background
Lecture 24 - The Multiverse and Theories of Everything