Cargo vesicles traveling along microtubles

Cargo vesicles (stained with green fluorescent dye) travelling along microtubules (stained red) in a living cell as studied in Professor Phil Nelson's group.


Sudbury Neutrino Observatory

The Sudbury Neutrino Observatory (SNO) is a second generation dedicated solar neutrino experiment which has extended the results of the Penn group with the Kamiokande II detector by measuring three reactions of solar neutrinos to fully resolve the solar neutrino problem.


Vector Bundles on Calabi-Yau Manifolds

Supersymmetric vacua of the heterotic string and M-theory are explored through the study of complex algebraic geometry.  The figure is from a recent paper by Prof. Burt Ovrut and collaborators on the Kahler cone substructure associated with the SU(2) bundle for different Kahler moduli.

Large Synoptic Survey Telescope at Night

A simulated night sky provides a background for the LSST facilities building on Cerro Pachón. The LSST will carry out a deep, 10 year imaging survey in six broad optical bands over the main survey area of 18,000 square degrees. Penn physicists play important roles in the leadership and anticipated dark energy science that will come from LSST.


Dark Excitons

Excitons are electrically neutral excited states of a material consisting of a bound state of an electron and a hole.  Prof. Jay Kikkawa explores previously unseen "dark exciton" states in carbon nanotubes and shows their dependence on geometry of the nanotube.