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Events on Thursday, February 20th, 2014

R. G. Herb Condensed Matter Seminar
Two- and three-dimensional spin liquid and interacting Majorana systems
Time: 10:00 am
Place: 5310 Chamberlin Hall
Speaker: Zohar Nussinov, Washington University
Abstract: We examine the Hubbard model on pyrochlore-type lattices and illustrate how spin liquid features arise at a proximate exactly solvable point and its surroundings. We further introduce a framework for dualities and with its aid demonstrate that interacting Majorana nanowire systems as well as direction dependent Hubbard type and other general planar systems may display various critical and spin glass type phenomena.
Host: Natalia Perkins
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Astronomy Colloquium
Four Problems in Trying to Form Galaxies(and how ISM Physics can Save US)
Time: 3:30 pm - 5:00 pm
Place: 4421 Sterling Hall
Speaker: Desika Narayanan, Haverford College
Abstract: Building a comprehensive picture for the evolution of galaxies
from early times through present epoch requires understanding a huge dynamic range of physical processes. With observations ranging from detections of galaxies less than a billion years after the Big Bang to stellar and molecular cloud mass spectra in the Milky Way, the challenge has been to develop a concordance theory for galaxy formation than simultaneously explains this diverse range of observed galaxy properties across cosmic epoch. At the heart of many of the central questions in the astrophysics of galaxy evolution lies the physics of the interstellar medium, and galactic-scale star formation. In this talk, I will describe how understanding the complex interplay between small scale star formation physics and global galaxy evolution processes can lead to considerable insight in long-standing problems in both fields.<br>
Host: Aleks Diamond-Stanic
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