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This Week at Physics

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Events on Tuesday, November 28th, 2017

Chaos & Complex Systems Seminar
Activation versus information in visual working memory
Time: 12:05 pm
Place: 4274 Chamberlin (refreshments will be served)
Speaker: Brad Postle, UW Department of Psychology
Abstract: Working memory refers to the ability to hold a small amount of information in mind, to manipulate it, and to use it to guide behavior. Individual differences in working memory capacity predict a wide range of psychometric and real-world outcomes, from general fluid intelligence to standardized testing performance to lifetime earning potential. "Working memory" is also often used, particularly by cautious psychologists and neuroscientists, as a proxy for the 'contents of consciousness.' This talk will address recent work -- using brain imaging (fMRI and EEG), brain stimulation (TMS), and computational modeling -- that challenges the longstanding assumption that for information to be held in working memory, it must be held in an active state.
Host: Clint Sprott
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NPAC (Nuclear/Particle/Astro/Cosmo) Forum
The Rise of the Leptons: Pulsar Emission Dominates the TeV Sky
Time: 2:30 pm
Place: 4274 Chamberlin
Speaker: Tim Linden, CCAP, Ohio State University
Abstract: Recent HAWC observations have found extended TeV emission coincident<br><br>
with the Geminga and Monogem pulsars. In this talk, I will show that<br><br>
these detections have significant implications for our understanding<br><br>
of pulsar emission. First, the spectrum and intensity of these TeV<br><br>
Halos indicates that a large fraction of the pulsar spindown energy is<br><br>
efficiently converted into electron-positron pairs. This provides<br><br>
observational evidence supporting pulsar interpretations of the rising<br><br>
positron fraction observed by PAMELA and AMS-02. Second, the isotropic<br><br>
nature of this emission provides a new avenue for detecting nearby<br><br>
pulsars with radio beams that are not oriented towards Earth. Lastly,<br><br>
I will show that the total emission from all unresolved pulsars<br><br>
produces the majority of the TeV gamma-ray flux observed from the<br><br>
Milky Way.
Host: Francis Halzen
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