4 papers
Riemannian Geometrical Optics: Surface Waves in Diffractive Scattering
Enrico De Micheli, Giacomo Monti Bragadin, Giovanni Alberto Viano
The geometrical diffraction theory, in the sense of Keller,is here reconsidered as an obstacle problem in the Riemannian geometry. The first result is the proof of the existence an…
Complex Angular Momentum Diagonalization of the Bethe-Salpeter Structure in General Quantum Field Theory
J. Bros, G. A. Viano
The Complex Angular Momentum (CAM) representation of (scalar) four-point functions has been previously established starting from the general principles of local relativistic Quantu…
Reconstructing the thermal Green functions at real times from those at imaginary times
G. Cuniberti, E. De Micheli, G. A. Viano
By exploiting the analyticity and boundary value properties of the thermal Green functions that result from the KMS condition in both time and energy complex variables, we treat th…
Complex Angular Momentum in General Quantum Field Theory
J. Bros, G. A. Viano
It is proven that for each given two-field channel - called the ``t-channel''- with (off-shell) ``scattering angle'' , the four-point Green's function of any scalar Quantum Fi…