April 2007 – Yale Podcast Network

24 – The Multiverse and Theories of Everything

By yalepodcasts | April 26, 2007

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Professor Bailyn begins the class with a discussion of a recent New York Times article about the discovery of a new, earth-like planet. He then discusses concepts such as epicycles, dark energy and dark matter; imaginary ideas invented to explain 96% of the universe. The Anthropic Principle is introduced and the possibility of the multiverse is addressed. Finally, biological arguments are put forth for how complexity occurs on a cosmological scale. The lecture and course conclude with a discussion on the fine differences between science and philosophy.

26 – Suicide, Part III: The Morality of Suicide and Course Conclusion

By yalepodcasts | April 26, 2007

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The lecture begins by examining the consequences a suicide has on both the person committing it and those around this person. The question is raised, however, whether this factor is the only that counts morally, as utilitarians claim, or whether other factors matter morally as well, as deontologists claim. The moral relevance of a deontological prohibition against harming the innocent is considered. A concluding summary of the course is offered.

23 – Other Constraints: The Cosmic Microwave Background

By yalepodcasts | April 24, 2007

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Reasons for the expansion of the universe are addressed at the start of this lecture, focusing especially on the acceleration of dark energy. Supernovae were the first evidence for the existence of dark energy. Two other proofs are presented. The first is the Cosmic Microwave Background, which is a form of electromagnetic radiation that is perfectly smooth and equal in all directions. It firmly supports the Big Bang theory. Projects attempting to measure it, such as COBE and WMAP, are discussed. Secondly, Large-Scale Clustering is introduced: by measuring the degree of clustering, astronomers hope to advance their understanding of dark energy and dark matter. Computer simulations of the evolution of the universe are shown.

25 – Suicide, Part II: Deciding under Uncertainty

By yalepodcasts | April 24, 2007

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The discussion of suicide continues. A few more cases are introduced to consider circumstances under which it might be rational to end one’s life, and more graphs are drawn that show relevant variations in the quality of one’s life. A question is then posed about how one should make a decision about continuing or ending life, given that one cannot know the future with certainty. Finally, two quick moral arguments concerning suicide which rest on theological premises are presented.

22 – Supernovae

By yalepodcasts | April 19, 2007

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Professor Bailyn offers a review of what is known so far about the expansion of the universe from observing galaxies, supernovae, and other celestial phenomena. The rate of the expansion of the universe is discussed along with the Big Rip theory and the balance of dark energy and dark matter in the universe over time. The point at which the universe shifts from accelerating to decelerating is examined. Worries related to the brightness of high redshift supernovae and the effects of gravitational lensing are explained. The lecture also describes current project designs for detecting supernovae at high or intermediate redshift, such as the Joint Dark Energy Mission (JDEM) and Large Synoptic Survey Telescope (LSST).

24 – Suicide, Part I: The Rationality of Suicide

By yalepodcasts | April 19, 2007

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This is the first of a series of lectures on suicide. Two very distinct contexts are presented in which the subject can be further explored. The first is rationality and the question of under what circumstances it makes sense to end one’s own life. The second is morality and the question of whether we can ever ethically justify resorting to suicide. The lecture’s focus is on the rational requirements of suicide, and Professor Kagan introduces a number of cases which demonstrate that ending one’s life, in certain instances, may be rationally sound.

21 – Dark Energy and the Accelerating Universe and the Big Rip

By yalepodcasts | April 17, 2007

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Class begins with a review of the mysterious nature of dark matter, which accounts for three quarters of the universe. Different models of the universe are graphed. The nature, frequency, and duration of supernovae are then addressed. Professor Bailyn presents data from the Supernova Cosmology Project and pictures of supernovae taken by the Hubble Space Telescope. The discovery of dark energy is revisited and the density of dark energy is calculated. The Big Rip is presented as an alternative hypothesis for the fate of the universe.

23 – How to Live Given the Certainty of Death

By yalepodcasts | April 17, 2007

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In this lecture, Professor Kagan invites students to pose the question of how one should live life knowing that it will certainly end in death. He also explores the issue of how we should set our goals and how we should go about achieving them, bearing in mind the time constraints. Other questions raised are how this ultimately affects the quality of our work and our accomplishments, as well as how we decide what is worth doing in life.

20 – Dark Matter

By yalepodcasts | April 12, 2007

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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.

22 – Fear of Death

By yalepodcasts | April 12, 2007

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Professor Kagan explores the issue of how thinking about death may influence the way we live. Fear as an emotional response to death is discussed as well as whether it is appropriate and under what conditions. A distinction is made between fear of the process of dying, and fear of death itself and what may come when one is dead. Finally, a number of other negative emotions are considered as possible appropriate responses to death and dying, such as anger, sadness, and sorrow.