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BA, Columbia University, 1964
Ph.D., Columbia University, 1977
My research interests have been in both theoretical and experimental physics. On the theoretical side, I have worked on phase transitions in low-temperature boson and fermion systems, quantum field theory anomalies, dyons and magnetic monopoles in nonabelian gauge theories, and renormalization theory. In experimental physics, I have been working on a precision measurement of vacuum polarization in muonic atoms as a test of quantum electrodynamics.
Most recently, I have been investigating theoretical models of the first-order and second-order phase transitions in helium-4 and helium-3. By using a Monte Carlo simulation on a three-dimensional spatial lattice, my group has been studying the thermodynamic properties of systems of interacting bosons (helium-4 atoms) and interacting fermions (helium-3 atoms). We have been able to do a complete analysis of the gas, normal liquid, superfluid, and solid phases of the boson system over a wide range of temperatures and densities. The fermion system has proven to be much harder to simulate, and we are presently trying to understand the p-wave pairing of fermions responsible for the superfluidity of helium-3
Physical Review Search
"Extended Bound States and Resonances of two Fermions on a Periodic Lattice" (with A. S. Blaer, H. C. Ren, and O. Tchernyshyov) Phys. Rev. B 55, 6035-6043 (1997) [pdf]
"Monte Carlo Simulations of Lattice Bosons in Three Dimensions" (with J. Han) Phys. Rev. A 46, 3225-3233 (1992) [pdf]
"Measurement of K X-Rays from Muonic Helium formed in a Low-Density Target in an Intense Pulsed Muon Beam" (with J. French, M. May, A. M. Sachs and E. Zavattini) Phys. Rev. A 40, 158 162 (1989) [pdf]
"Study of the Polarization Dependence of the Photoelectric Effect in the Soft X-Ray Band: A Focal Plane Photoelectric Stellar X-Ray Polarimeter for the SPECTRUM-X-Gamma Mission" (with A. Heckler, P. Kaaret and R. Novick) SPIE X-Ray/EUV Optics for Astronomy and Microscopy 1160, 580 (1989).
"Anomalous Fermion Production by a Julia-Zee Dyon" (with N. Christ and J. Tang) Phys. Rev. Lett. 47, 1364-1367 (1981) [pdf]