Enrico C. Poggio

Developments in Radar Imaging

Using range and Doppler information to produce radar images is a technique used in such diverse fields as air-to-ground imaging of objects, terrain, and oceans and ground-to-air imaging of aircraft, space objects, and planets. A review of the range-Doppler technique is presented along with a description of radar imaging forms including details of data acquisition and processing techniques.

Vanishing of Charge Renormalization and Anomalies in a Supersymmetric Gauge Theory

Abstract We have determined the charge renormalization function β(g) for the supersymmetric nonabelian gauge model of Gliozzi, Scherk and Olive. We find that its one-and two-loop coefficients are zero. The model is thus anomaly-free at the level of our calculation.

Supersymmetric regulators and supercurrent anomalies

Abstract The supercurrent anomalies of the supercurrent S μ of the supersymmetric Yang-Mills theory in Wess-Zumino gauge are computed using the supersymmetric dimensional regulator of Siegel. It is shown that γ μ S μ =0 and ∂ μ S μ ≠0 in agreement with an earlier calculation based on the Adler-Rosenberg method. The problem of exhibiting the chiral anomaly and a regulator for local supersymmetry suggests that the interpretation of dimensional reduction in component language is incomplete.

Summing infrared singularities in non-abelian gauge theories: The behavior of the exclusive color-singlet quark form factor

Abstract The near-mass-shell behavior of the exclusive color-singlet quark form factor is calculated up to the two-loops. In the Landau gauge the result can be expressed as the second order expansion of exp [ B ( p , p ′; g 2 ( k 2 ))], where B ( p , p ′; g 2 ( k 2 )) is the lowest order contribution evaluated with a gluon propagator of the form (−i/( k 2 − i e )) ( g μν − ( k μ k ν / k 2 ) × g 2 ( k 2 ) being the long-distance invariant charge. This result is valid to all orders, in an order by order near-mass-shell leading logirithm approximation.

The infrared structure of the quark-antiquark scattering kernel in quantumchromodynamics: A clue to the nature of the quark binding potential?☆

Abstract The equal rate, near-mass-shell behavior of the two particle irreducible, spin-independent, color singlet channel quark-antiquark (qq) scattering kernel is studied to all orders in perturbation theory. A general functional form in terms of the long-distance Yang-Mills invariant charge g(t),t→0, t being the momentum transfer, is determined. Under certain conditions, the behavior of the Bethe-Salpeter iteration of this kernel in the qq threshold regime suggests the existence of a universal qq effective potential of the form g2eff[g(t)]/t.