779 research outputs found
S-Matrices of perturbed unitary minimal models: IRF-Formulation and Bootstrap-Program
We analyze the algebraic structure of perturbed minimal models
relating them to graph-state models with an underlying Birman-Wenzl-Murakami
algebra. Using this approach one can clarify some physical properties and
reformulate the bootstrap equations. These are used to calculate the -matrix
elements of higher kinks, and to determine the breather spectrum of the
perturbations of the unitary minimal models \M_{r,r+1}.Comment: 20 pp, SISSA 192/92/E
Local Operators in Massive Quantum Field Theories
Contribution to the proceedings of Schladming 1995. A review of the form
factor approach and its utilisation to determine the space of local operators
of integrable massive quantum theories is given. A few applications are
discussed.Comment: 6 pages, late
On the Operator Content of the Sinh-Gordon Model
We classify the operator content of local hermitian scalar operators in the
Sinh-Gordon model by means of independent solutions of the form-factor
bootstrap equations. The corresponding linear space is organized into a
tower-like structure of dimension for the form factors and
. Analyzing the cluster property of the form factors, a particular
class of these solutions can be identified with the matrix elements of the
operators . We also present the complete expression of the form
factors of the elementary field and the trace of the energy-momentum
tensor .Comment: ISAS/EP/93/42, to appear in Phys. Lett.
On the S-matrix of the Sub-leading Magnetic Deformation of the Tricritical Ising Model in Two Dimensions
We compute the -matrix of the Tricritical Ising Model perturbed by the
subleading magnetic operator using Smirnov's RSOS reduction of the
Izergin-Korepin model. The massive model contains kink excitations which
interpolate between two degenerate asymmetric vacua. As a consequence of the
different structure of the two vacua, the crossing symmetry is implemented in a
non-trivial way. We use finite-size techniques to compare our results with the
numerical data obtained by the Truncated Conformal Space Approach and find good
agreement.Comment: 21 page
A Multi-Grid Method for the Resolution of Thermodynamic Bethe Ansatz Equations
We present a multi-grid algorithm in order to solve numerically the
thermodynamic Bethe ansatz equations. We specifically adapt the program to
compute the data of the conformal field theory reached in the ultraviolet
limit. Submitted to Computer Physics CommunicationsComment: SISSA-123/92/FM, 15p
Asymptotic factorisation of form factors in two-dimensional quantum field theory
It is shown that the scaling operators in the conformal limit of a
two-dimensional field theory have massive form factors which obey a simple
factorisation property in rapidity space. This has been used to identify such
operators within the form factor bootstrap approach. A sum rule which yields
the scaling dimension of such operators is also derived.Comment: 11 pages, late
Augmented reality usage for prototyping speed up
The first part of the article describes our approach for solution of this
problem by means of Augmented Reality. The merging of the real world model and
digital objects allows streamline the work with the model and speed up the
whole production phase significantly. The main advantage of augmented reality
is the possibility of direct manipulation with the scene using a portable
digital camera. Also adding digital objects into the scene could be done using
identification markers placed on the surface of the model. Therefore it is not
necessary to work with special input devices and lose the contact with the real
world model. Adjustments are done directly on the model. The key problem of
outlined solution is the ability of identification of an object within the
camera picture and its replacement with the digital object. The second part of
the article is focused especially on the identification of exact position and
orientation of the marker within the picture. The identification marker is
generalized into the triple of points which represents a general plane in
space. There is discussed the space identification of these points and the
description of representation of their position and orientation be means of
transformation matrix. This matrix is used for rendering of the graphical
objects (e. g. in OpenGL and Direct3D).Comment: Keywords: augmented reality, prototyping, pose estimation,
transformation matri
Counting the local fields in SG theory.
In terms of the form factor bootstrap we describe all the local fields in SG
theory and check the agreement with the free fermion case. We discuss the
interesting structure responsible for counting the local fields.Comment: 16 pages AMSTEX References to the papers by A. Koubek and G. Mussargo
are added. In view of them the stasus of the problem with scalar S-matrices
is reconsidered
- âŠ