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Article
Sul meccanismo di azione delle sostanze che modificano lo sviluppo embrionale
The lithium chloride and the substances, which are capable of producing a similar effect on the embryo development, increase the viscosity of proteins from the Amphibian embryo. The sodium thiocyanate, the sod...
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Article
Evidence for pion-pion interactions froms-wave pion-nucleon scattering
By fitting the s-wave partial amplitudes for π- -scattering, in an unphysical region, we have greatly extended the energy range over which we can examine the contribution from t...
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Article
Subtraction constants inπ-π→ dispersion relationdispersion relation
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Article
Analysis ofS-matrix singularities by means of operator technique
The problem of determining the singularities of theS-matrix for a given angular momentum in thek-plane, is reduced to an eigenvalue problem for compact operators. In particular we examine the dependence of the po...
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Article
Properties of relativistic bound states
In this paper we examine some properties of two-boson bound states for very high binding energy in the Bethe-Salpeter framework. We point out the relativistic nature of the high binding energy limit and we giv...
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Article
Retardation effects and gauge transformations in the Bethe-Salpeter equations
The ladder Bethe-Salpeter equation with Feynman propagators gives rise to spurious corrections of orderv/c to the nonrelativistic limit. The exact cancellation of these retardation effects by the introduction of ...
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Article
Regge families in the wick-cutkosky model. Extension of previous results
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Article
Regge families in the Wick-Cutkosky model
The bound solutions of the Wick-Cutkosky model are analytically continued to the whole complexl-plane by means of a method utilizing a Volterra integral equation equivalent to the Cutkosky differential equation. ...
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Article
Commutators near the light cone, bjorken limits andO 4 expansion. Study of ladder models
A method based onO 4 expansion of thet=0 Compton amplitude is developed to discuss the light-cone behaviour of the matrix element of a current commutator. The behaviour of theO 4 partial waves at small distances ...
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Article
Commutators near the light-cone
A concrete dynamical model is studied to obtain information on scaling and related problems. The role ofO 4 expansion is pointed out, and the relation of scaling to small-distance behaviour of interactions is mad...
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Article
Continuation from deep electroproduction to deep electron-positron annihilation
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Article
General threshold relation between deep inelastic electron scattering and deep inelastic electron-positron annihilation
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Article
Light-cone dominance of vertex functions for composite fields and asymptotic behaviour of elastic form factors
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Article
Vertex functions and form factors for conformal spin-1/2 systems
Conformal on-shell wave functions are derived for spin-1/2 particle decaying virtually in spin 0 and spin 1/2. The relation to the off-shell vertex function is worked out and it is shown that shadow singularit...
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Article
Temporal gauges and time boundary conditions
A new gauge of temporal nature characterized by \(\dot A_0 = 0\) is discussed. This gauge is particularly useful in...
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Article
Temporal gauge on a periodic lattice
We give a formulation of the static gauge \(\dot A_0 = 0\) , on a lattice with periodic boundary conditions. We disc...
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Article
General proof of Osterwalder-Schrader positivity for the Wilson action
We extend the proof by Osterwalder and Seiler of reflection positivity of lattice gauge theories with fermions to the case in which the reflection is performed with respect to planes containing sites. Our proo...
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Article
The radial gauge propagator
We solve the Green’s function equation for a gauge field both in presence of the sharp gauge fixingx·A=0 and with the gauge-fixing term (x·A)2/2β. The ensuing propagators are symmetric in the field arguments.
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Chapter and Conference Paper
Hamiltonian Structure of 2+1 Dimensional Gravity
A summary is given of some results and perspectives of the hamiltonian ADM approach to 2 + 1 dimensional gravity. After recalling the classical results for closed universes in the absence of matter, we go over...