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Browsing by Issue Date
Now showing items 21-40 of 6654
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(Società Italiana di Fisica, 1982)An algebraic method is given to construct the currents corresponding to the infinitely many conserved densities for the whole family of nonlinear evolution equations associated with the Schroedinger operator.
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(SISSA Library, 1982)The first order necessary conditions for nonsmooth problems of Lagrange, Bolza, multiple integral and optimal control are given. The necessary conditions are expressed in terms of differential inclusions. We deal with some ...
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(Società Italiana di Fisica, 1982)The asymptotic expansion of the heat kernel is employed to derive the Einstein action from the matter effective action. The advantages of this approach are discussed. We point out some problems arising when scalar fields, ...
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(SISSA Library, 1982)We study the plasma phase of the two dimensional Coulomb gas in the small density limit. The analysis is done using the correspondence of the Coulomb gas with the 1 + 1 Sine Gordon model, which has been exactly solved by ...
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(SISSA Library, 1982)A temptative connection between the mean field theory and a variational version of the Migdal-Kadanoff renormalization technique is proposed for spin systems, through a direct calculation of the free energy. Some good ...
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(SISSA Library, 1982)A proper lower bound approximation to the true free energy per site of an Ising model with infinite range interaction is obtained by the Migdal-Kadanoff real space recursion formulae. The results for the critical behaviour ...
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(SISSA Library, 1982)The role of multiple quark scattering subprocesses in large-Pt jet production from high-energy hadron-hadron collisions is discussed. In particular, the connection with multiconstituent distributions is emphasized.
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(SISSA Library, 1982)Photons emitted by massive photinos (γ) formed in the hot big bang could ionise the intergalactic medium and galactic halos to the observed extent if mγ ~ 100 eV and the radiative lifetime τ ~ 1027 s. These photinos could ...
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(SISSA Library, 1982)
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(SISSA Library, 1982)In this paper we derive in a completely rigorous way a family of inequalities holding for proper combinations of the squared norms of the states generated by the quantum evolution of a composed quantum system in the presence ...
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(SISSA Library, 1982)
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(SISSA Library, 1982)It is shown that the s → 1,0 limit of the Potts gauge model describes plaquettes percolation as the analogous limit of the spin model describes the bond percolation. These results strengthen further the connection between ...
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(SISSA Library, 1982)A relativistic quantum field theory is presented where point-like dyons describe closed spacetime trajectories and are coupled to e.m. field degrees of freedom, a path integral over trajectories and a functional integration ...
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(SISSA Library, 1982)
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(SISSA Library, 1982)We present a model of a bi—excitonic molecule, consisting of two electrons and two holes bound together in a quasi—one—dimensional semiconductor. The problem is solved exactly in principle following the Hyperspheric Harmonic ...
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(SISSA Library, 1982)
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(SISSA Library, 1982)We study the covariance properties of Murai’s, Dirac—Murai’s and Todorov’s spinor wave equations in the whole M2N,2 space with respect to SO(2N,2) group rotations. These rotations are in two—to—one correspondence with the ...
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(SISSA Library, 1982)A non-perturbative treatment of the infrared problem in quantum electrodynamics is presented Starting from the local and covariant correlation functions of the Gupta-Bleuler formulation an explicit construction of the ...
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(SISSA Library, 1982)
Now showing items 21-40 of 6654
