Work on mathematical physics:

1. Quantum weak values are not unique. what do they actually measure? arXiv:0909.0295 . This is later, more refined, less technical, and less complete version of the following reference.
2. What do quantum "weak" measurements actually measure? arXiv:0908.0035
3. Comment on Phys. Rev. D 60 084017 "Classical self-force" by F. Rohrlich,
   gr-qc/0502029 (paper only),
   (.PDF version of paper with referees' reports and comments appended).
   The comments include analysis of recent work of H. Spohn
   ("The critical manifold of the Lorentz-Dirac equation", Europhysics Letters 50 (2000), 287-292, physics/9911027),
   necessitated by claims of one of the referees, along with an invited reply from Dr. Spohn.
4. Asymptotics of a proposed delay-differential equation of motion for charged particles,
   gr-qc/0205065 (paper only),
   PDF version of paper with referees' reports and comments appended.  This is about 35 pages,
    so it may take noticeable time to download with a slow connection.
   
5. Radiation from a charge uniformly accelerated for all time, Gen. Rel. Grav. 29 (1997), 1463-1472, gr-qc/9711027
6. (with D. Endres)  Nonuniqueness of the "physical" acceleration in the Lorentz-Dirac equation, Foundations of Physics 25 (1995), 442-464
7. Unphysical and physical solutions of the Lorentz-Dirac equation, Foundations of Physics 23 (1993), 1093-1121
8. Energy radiation of charged particles in conformally flat spacetimes, gr-qc/9308023
9. Radiation from a uniformly accelerated charge and the equivalence principle, gr-qc/9303025
Foundations of Physics, 32 (2002)
10. The no ghost theorem in string theory, Results in Mathematics 21 (1992), 379-395
11. Relativistic Electrodynamics and Differential Geometry, Springer-Verlag, 1987
    
12. Uniqueness of the Hamiltonian in quantum field theories, Commun. Math. Phys. 13 (1969), 159-166, http://projecteuclid.org/Dienst/UI/1.0/Summarize/euclid.cmp/1103841485