Kirigami Topology

Professor Randall Kamien studies the physics and mathematics of kirigami — an extension of origami that allows cutting holes into the paper.  By treating the sheet of paper as a two-dimensional crystalline lattice, the folds, cuts, and pleats, can be understood in terms of topological defects in the underlying structure.

Quintic Calabi-Yau manifold

In superstring theory, the fundamental building block is an extended object, namely a string, whose vibrations would give rise to the particles encountered in nature. In order to solve certain classic problems of unified gauge theories, the 4-dimensional effective theory should be in a space which is a Calabi-Yau manifold of complex dimension 3.


Science Verification Images from DES

High resolution color image of area SPT-CL J2332-5358 from the Dark Energy Survey Science Verification stage of testing of the telescope and DECam.

The SNO+ Experiment

SNO-plus is a multi-purpose neutrino experiment, located 2km underground in an active nickel mine in Sudbury, Ontario. It is a large liquid scintillator experiment, currently under construction, inheriting most of the detector hardware from the successful SNO experiment.  The Penn SNO-plus group is led by Professor Josh Klein.


Air-fluidized grains

Spatiotemporal heterogenous dynamics in air-fluidized grains near jamming. The colors represent the average speed over a time interval large enough for grain-sized rms displacement. The most mobile grains are in red, the least are in blue, across the rainbow. Note the stringy correlations of the mobile grains in red. From the lab of Prof. Doug Durian.