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This Week at Physics

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Events on Tuesday, April 30th, 2013

Chaos & Complex Systems Seminar
Aldo Leopold, phenology and climate change
Time: 12:05 pm
Place: 4274 Chamberlin (refreshments will be served)
Speaker: Stan Temple, Nelson Institute
Abstract: Aldo Leopold, best known as the author of A Sand County Almanac, was a keen observer of the natural world. Throughout his life he kept daily journals recording observations of seasonal events, especially those occurring at his beloved "shack" on the Leopold farm which was the setting for many essays in A Sand County Almanac. Leopold's meticulous phenological observations have provided us with an unparalleled record of when plants bloomed, birds migrated and other natural events. Analyzing his historical observations of hundreds of natural events as well as recent records helps us understand how climate change is affecting the ecological community.
Host: Sprott
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Theory Seminar (High Energy/Cosmology)
Double Disk Dark Matter
Time: 4:00 pm
Place: 5280 Chamberlin Hall
Speaker: Andrey Katz, Harvard University
Abstract: We consider a scenario that we call Partially Interacting Dark Matter (PIDM). This scenario contains self-interacting dark matter, but it is not the dominant Dark Matter component. Even if PIDM contains only a fraction of the net dark matter density, comparable to the baryonic fraction, the subdominant componentaEuroTMs interactions can lead to interesting and potentially observable consequences. Our primary focus will be the special case of Double-Disk Dark Matter (DDDM), in which self-interactions allow the dark matter to lose enough energy to lead to dynamics similar to those in the baryonic sector. We explore a simple model in which DDDM can cool einotfciently and form a disk within galaxies, and we evaluate some of the possible observational signatures. The most prominent signal of such a scenario could be an enhanced indirect detection signature with a distinctive spatial distribution. Such scenarios also predict additional dark radiation degrees of freedom that could soon be detectable and would ininot,uence the interpretation of future data, such as that from Planck and from the Gaia satellite.
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