Michael Philip Fry
Fellow Emeritus, Pure & Applied Mathematics

Publications and Further Research Outputs

Peer-Reviewed Publications

M. P. Fry , Stability of QED, Physical Review D, 84, (065021), 2011 Journal Article, 2011 URL TARA - Full Text DOI

M.P. Fry, Nonperturbative results for the mass dependence of the QED fermion determinant, Physical Review D, 81, (10), 2010, p4 Journal Article, 2010 DOI URL TARA - Full Text

M. P. Fry, Evidence for mass zeros of the fermionic determinant in four-dimensional quantum electrodynamics, Physical Review, D75, 2007, p065002 - 065013 Journal Article, 2007

M. P. Fry, Fermion Determinants: Some Recent Analytic Results, Int. J. Mod. Phys. A , Paris, 7-11 June, 20, 2005, pp4492 - 4496 Conference Paper, 2005

M. P. Fry, Fermion determinants: some recent analytic results, International Journal of Modern Physics, A20, 2005, p4492 - 4496 Journal Article, 2005

M. P. Fry, Fermion Determinants 2003, Proceedings of the Sixth Workshop on Quantum Field Theory under the Influence of External Conditions, U. Oklahoma, Sept. 15-19, 2003, edited by Kimball A. Milton , Rinton Press, Princeton, NJ, 2004, pp271 Conference Paper, 2004

M. P. Fry, Fermion determinant for general background gauge fields, Physical Review D, 67, 2003, p065017 - 065017 Journal Article, 2003

M. P. Fry, Fermion determinants, Int. J. Mod. Phys. A, 17, 2002, p936 - 936 Journal Article, 2002

M. P. Fry, Chiral limit of the two-dimensional fermionic determinant in a general magnetic field, J. Math. Phys., 41, 2000, p1691 - 1710 Journal Article, 2000

M. P. Fry, Mass zeros in the one-loop effective actions of QED in 1 + 1 and 1 + 3 dimensions, Physical Review D, 62, 2000, p125007 - 125007 Journal Article, 2000

M. P. Fry, Effective actions in QED in 1+1, 2+1 and 3+1 dimensions, Int. J. Mod. Phys. A, 12, 1997, p1153 - 1153 Journal Article, 1997

M. P. Fry, Paramagnetism, zero modes and mass singularities in QED in 1+1, 2+1 and 3+1 dimensions, Physical Review D, 55, 1997, p968 - 968 Journal Article, 1997

M. P. Fry, QED in strong, finite-flux magnetic fields, Physical Review D, 53, 1996, p980 - 980 Journal Article, 1996

M. P. Fry, QED in inhomogeneous magnetic fields, Physical Review D, 54, 1996, p6444 - 6444 Journal Article, 1996

M. P. Fry, Fermion determinants in static, inhomogeneous magnetic fields, Physical Review D, 51, 1995, p810 - 810 Journal Article, 1995

M. P. Fry, Fermionic Determinant of the Massive Schwinger Model, Physical Review D, 47, 1993, p2629 - 2632 Journal Article, 1993

M. P. Fry, Massive Schwinger model and four-dimensional QED: The connection, Physical Review D, 45, 1992, p682 - 686 Journal Article, 1992

Research Expertise


Within the Standard Model fermionic determinants are required for the calculation of every physical process. They are the means by which virtual fermion loops are incorporated into a calculation. Without them color screening, quark fragmentation into hadrons and unitarity would be lost. Fermionic determinants are therefore fundamental. They are also hard to calculate, and physicists by and large lost interest in them during the early 1980s. With the advent of large machines lattice QCD physicists are now starting to include the determinant in their calculations. But analytic results remain very scarce. As with any problem in physics one begins with the simplest cases first, namely, QED determinants in 2, 3, and 4 dimensions. To be useful these determinants need to be known for a general background gauge field. Becuase of this the best one can hope for are restrictive upper and lower bounds on a determinant and its asymptotic behavior for small fermion mass and strong coupling. This is the subject of the papers listed below. It is expected that when QCD machines become large enough these results can be used to test lattice determinant calculations when extrapolated to infinite volume and zero lattice spacing.


Awards and Honours

Fellow of Trinity College Dublin

Alexander von Humboldt Fellow 1975-77

U.S. National Research Council Fellow 1970-72