# The Department of Natural Sciences

## Peter Orland

High Energy Physics

**Email:** orland@nbi.dk

**Phone:** 646 660-6205

**Location**:
Rm 906F, 17 Lexington Ave

Peter Orland, Ph.D., University of California at Santa Cruz (Physics), has a record of scholarly publications that covers three different areas of particle physics, including statistical mechanics, quantum field theory(gauge theory), and string theory. He has helped postdoctoral fellowships at prestigious institutions; he spent two years at Imperial College, London, and another at Niels Bohr Institute in Copenhagen. Professor Orland has a fine record of teaching introductory physics courses for both non-majors and majors in the sciences. Dr. Orland is a faculty member of the Ph.D. Program in Physics, CUNY Graduate Center.

**Research**

Currently, my main interest is the long-range physics of Yang-Mills theories, in particular QCD. I have been looking at the confinement problem in two different ways:

1. 2+1-dimensional lattice Yang-Mills theory in axial gauge. This theory admits an unusual weak-coupling expansion, different from conventional perturbation theory. The expansion is around 1+1-dimensional integrable field theories, where the spectrum and mass gap are known. Unlike the standard weak-coupling methods, confinement occurs very simply.

2. I have also been looking for some time at the properties of gauge-theory orbit space. This is the space of gauge connections modulo gauge transformations - QCD configurations are not gauge fields, but rather gauge orbits. I have been able to find the measure and Riemann curvature on this space in 2+1 dimensions on a special set of coordinates. I have been trying to find similar coordinates in 3+1 dimensions, where new obstacles occur - in some sense the Gribov problem is more severe as dimension increases.

In addition to the above I have been looking at problems in general relativity and cosmology and in integrable quantum field theories.

**Publications **

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