Results 271 to 280 of about 71,366,600 (306)

Scattering and Bound States in Euclidean Lattice Quantum Field Theories

Annales Henri Poincaré, 2001
The problem of asymptotic completeness (AC) is the question whether all pure states can be interpreted in terms of scattering states of particles. The authors study here the two-body AC in massive Euclidean lattice quantum field theories. Schwinger \(n\)-point functions \(S_n(x_1,\dots, x_n)\), \(x_i\in \mathbb{Z}^{d+1}\) with \(d\geq 1\), and Bethe ...
Auil, F., Barata, J. C. A.
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Lattice Boltzmann method for quantum field theory

Journal of Physics A: Mathematical and Theoretical, 2007
It is shown that a (1 + 1)-dimensional lattice Boltzmann discretization of the Klein–Gordon and Dirac equations complies with equal-time-commutation-relations. As a result, the lattice Boltzmann discretization leads to a consistent lattice formulation of the quantum field theory in 1 + 1 dimensions.
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Critical aspects of quantum field theories on the lattice

2008
Dottorato di ricerca in Fisica XXI ...
Gravina, Mario, Papa, Alessandro, Falcone, Giovanni   +2 more
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Lattice fractional quantum field theory: Exact differences approach

Modern Physics Letters A, 2020
An approach, which is based on exact fractional differences, is used to formulate a lattice fractional field theories on unbounded lattice spacetime. An exact discretization of differential and integral operators of integer and non-integer orders is suggested.
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A quantum field theory of melting and lattice dynamics

Physica A: Statistical Mechanics and its Applications, 1986
Abstract The melting and the lattice dynamics are investigated from the view-point of a quantum field theory at finite temperature (thermo field theory). Our theory starts with ion cores and valence electrons interacting with each other as the first principle.
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Quantum theory of an antiferromagnet on a triangular lattice in a magnetic field

Journal of Physics: Condensed Matter, 1991
The reorientation process in a magnetic field in two-dimensional isotropic and XY quantum Heisenberg antiferromagnets is shown to occur through the intermediate phase with unbroken continuous symmetry and constant magnetization equal to one third of the saturation value.
A V Chubukov, D I Golosov
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Quantum solitons and anyons in lattice field theories

Nuclear Physics B - Proceedings Supplements, 1990
We briefly report some results obtained in a joint work with J. Frohlich on quantization and particle structure analysis of solitons in Lattice Field Theories. In particular we discuss abelian gauge theories with Chern-Simons term coupled to Higgs fields in three space-time dimensions.
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Lower bounds for quantum Hamiltonians in lattice field theories

Physical Review D, 1978
A method for approximately including quantum effects on the solution to lattice field theories is presented. The formalism is an extension of the semiquantum approximation of Sachrajda, Weldon, and Blankenbecler to obtain lower bounds for quantum Hamiltonians. This approach yields classical-like equations in which the effects of quantum fluctuations is
Richard Blankenbecler, Jose R. Fulco
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Lattice Renormalization of Non-Perturbative Quantum Field Theory

1980
We discuss lattice renormalization as a basis for understanding non-perturbative effects in quantum field theory. We first study two solvable examples of quantum field theory in two dimensions where lattice renormalization may be explicitly carried out, namely the Ising field theory and the Thirring model.
Barry M. Mc Coy, Tai Tsun Wu
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A quantum field theory of lattice dynamics and melting in compounds

Il Nuovo Cimento D, 1989
A unified theory on the lattice dynamics and the melting in compounds is presented by taking into account the Coulomb interaction. The melting temperature is determined by the mean value of the eigenfrequencies of the atoms. The theory is applied to zincblende and rock salt structure crystals.
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