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Events at Physics

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Events on Tuesday, November 10th, 2015

Astronomy Colloquium
Colloquium at Noon
Cosmic Ray Transport in MHD Turbulence
Time: 12:00 pm
Place: 4421 Sterling Hall, NOON TALK
Speaker: Huirong Yan, Max-Planck Institute
Abstract: Recent advances in MHD turbulence call for revisions in the paradigm of cosmic ray transport. I would like to clarify some outstanding issues related to particle transport in realistic turbulent astrophysical environments. We have carried out both analytical and numerical studies aiming at a theory-justified picture of the acceleration and transport processes based on the numerically confirmed modern theory of MHD turbulence. I shall address the issue of the transport of CRs, both parallel and perpendicular to the magnetic field and show that demonstrate that cosmic ray transport is medium dependent since compressible fast modes dominate the interactions. I shall also address the issue of perpendicular to the magnetic field and show that cosmic ray cross field transport is diffusive on large scales and super diffusive on scales less than the injection scale of turbulence. Implications for Galactic cosmic ray propagation and shock acceleration will be presented. Last but not least, the CR transport in molecular clouds shall be briefly discussed.
Host: Prof Alex Lazarian
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Chaos & Complex Systems Seminar
Will Darwin become a casualty of the Cambrian Explosion?
Time: 12:05 pm
Place: 4274 Chamberlin (refreshments will be served)
Speaker: Jim Blair, Milton and Edgewood College
Abstract: * Darwin and Neo-Darwinism<br>
* Anomalies and Paradigm Shifts<br>
* What Natural Selection does not Explain<br>
* Mendel, the Big Bang and the Cambrian Explosion<br>
Host: Sprott
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Theory Seminar (High Energy/Cosmology)
The Weak Gravity Conjecture: Variants and Inflationary Implications
Time: 3:30 pm
Place: 5280 Chamberlin Hall
Speaker: Tom Rudelius, Harvard University
Abstract: Although the landscape of effective theories constructed in string theory is enormous, the "swampland" of effective theories that do not admit a UV completion with gravity appears to be even larger. The weak gravity conjecture is a family of conjectures that attempt to delineate the swampland from the landscape. In this talk, we will explore this family of conjectures, and we will see that they have important implications for inflationary model building.
Host: Pablo Soler
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