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The AstronomersNobel
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The Universe is a strange place

About the Lecture Perhaps the universe is not so much strange as brimming with lovely paradox. The search for such beauty seems to lie at the heart of Frank Wilczek’s work. Twentieth century physics, from Einstein through Wilczek’s own Nobel Prize-winning efforts, involves demonstrating the existence of a topsy-turvy reality: for instance, that such sub-atomic particles as quarks and gluons, which have little or no mass, “orchestrate themselves into not just protons and neutrons but you and me,” according to Wilczek. “How is it possible to construct heavy objects out of objects that weigh nothing?,” he asks. Only by “creating mass out of pure energy.” These particles are essentially “excitations in otherwise empty space.” Says Wilczek: “That suggests something …beautiful and poetic: the masses of particles are not like, or similar to or metaphorically suggested by—they are the tones or frequencies of vibration patterns in dynamical voids.” The theory of quarks and gluons and the strong interaction accounts quantitatively for “the mass of protons, neutrons and ultimately you and me and everything around us.” But physics has not yet squared away all aspects of the universe. Wilzcek says that “in cosmology, we meet our match, and don’t know what’s going on.” This is because scientists can’t account for much of the mass in the cosmos. 70% of this mass is in “dark energy,” which is pushing the universe apart. Wilczek hopes that explanations for the dark stuff will emerge through improving equations, unifying theories of different interactions and extending their symmetries. “Beautifying equations leads not to ugly consequences but beautiful surprises,” he concludes.

Channels: Lectures In Astronomy  Cosmology  Major questions in astronomy 

Added: 3629 days ago by deek

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John Mather '68 on the History of the Universe

John Mather's "Humble Arrogance": 2006 Nobel Prize: Goddard Space Flight Center: Nobel Laureate John Mather '68 tells the story of how the universe began with a Big Bang, how it could have produced an earth where sentient beings can live, and how those beings are discovering their history. Mather, co-recipient of the 2006 Nobel Prize in Physics for providing increased support for the Big Bang theory of the universe, is a senior astrophysicist at NASA's Goddard Space Flight Center. He includes in his talk, the 2007 McCabe Lecture, Einstein's biggest mistake, how Edwin Hubble discovered the expansion of the universe, and NASA's plans for the next great telescope in space, the James Webb Space Telescope.

Channels: The Astronomers 

Added: 3737 days ago by deek

Views: 654 | Comments: 0

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