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Search Results: 1 - 10 of 88 matches for " Anni Koubek "
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Local Operators in Massive Quantum Field Theories
Anni Koubek
Physics , 1995, DOI: 10.1007/BFb0102567
Abstract: 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.
A method to determine the operator content of perturbed conformal field theories
Anni Koubek
Physics , 1995, DOI: 10.1016/0370-2693(94)01680-B
Abstract: A method to determine the full structure of the space of local operators of massive integrable field theories, based on the form factor bootstrap approach is presented. This method is applied to the integrable perturbations of the Ising conformal point. It is found that the content of local operators can be expressed in terms of fermionic sum representations of the characters $\c(q)$ of the Virasoro irreducible representations of the minimal model $\M_{3,4}$. The space of operators factorises into chiral components as $Z=\sum \c(q) \c(\q)$, but with the relation $\q=q^{-1}$.
Form-Factor Bootstrap and the Operator Content of Perturbed Minimal Models
A. Koubek
Physics , 1994, DOI: 10.1016/0550-3213(94)90368-9
Abstract: The form-factor bootstrap approach is applied to the perturbed minimal models $M_{2,2n+3}$ in the direction of the primary field $\phi_{1,3}$. These theories are integrable and contain $n$ massive scalar particles, whose $S$--matrix is purely elastic. The form-factor equations do not refer to a specific operator. We use this fact to classify the operator content of these models. We show that the perturbed models contain the same number of primary fields as the conformal ones. Explicit solutions are constructed and conjectured to correspond to the off-critical primary fields $\phi_{1,k}$.
The space of local operators in perturbed conformal field theories,
A. Koubek
Physics , 1995, DOI: 10.1016/0550-3213(94)00560-2
Abstract: The space of local operators in massive deformations of conformal field theories is analysed. For several model systems it is shown that one can define chiral sectors in the theory, such that the chiral field content is in a one-to-one correspondence with that of the underlying conformal field theory. The full space of operators consists of the descendent spaces of all scalar fields. If the theory contains asymptotic states which satisfy generalised statistics, the form factor equations admit in addition also solutions corresponding to the descendent spaces of the para-fermionic operators of the same spin as the asymptotic states. The derivation of these results uses $q$-sum expressions for the characters and $q$-difference equations used in proving Rogers-Ramanujan type identities.
S-Matrices of $φ_{1,2}$ perturbed unitary minimal models: IRF-Formulation and Bootstrap-Program
A. Koubek
Physics , 1992, DOI: 10.1142/S0217751X94000820
Abstract: We analyze the algebraic structure of $\phi_{1,2}$ 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 $S$-matrix elements of higher kinks, and to determine the breather spectrum of the $\phi_{1,2}$ perturbations of the unitary minimal models $\M_{r,r+1}$.
On the Operator Content of the Sinh-Gordon Model
A. Koubek,G. Mussardo
Physics , 1993, DOI: 10.1016/0370-2693(93)90554-U
Abstract: 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 $n$ for the form factors $F_{2n}$ and $F_{2n-1}$. Analyzing the cluster property of the form factors, a particular class of these solutions can be identified with the matrix elements of the operators $e^{k g\phi}$. We also present the complete expression of the form factors of the elementary field $\phi(x)$ and the trace of the energy-momentum tensor $\Theta(x)$.
A Multi-Grid Method for the Resolution of Thermodynamic Bethe Ansatz Equations
A. Borzi,A. Koubek
Physics , 1992, DOI: 10.1016/0010-4655(93)90169-D
Abstract: 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 Communications
Augmented Reality Implementation Methods in Mainstream Applications
David Prochazka,Tomas Koubek
Computer Science , 2011,
Abstract: Augmented reality has became an useful tool in many areas from space exploration to military applications. Although used theoretical principles are well known for almost a decade, the augmented reality is almost exclusively used in high budget solutions with a special hardware. However, in last few years we could see rising popularity of many projects focused on deployment of the augmented reality on different mobile devices. Our article is aimed on developers who consider development of an augmented reality application for the mainstream market. Such developers will be forced to keep the application price, therefore also the development price, at reasonable level. Usage of existing image processing software library could bring a significant cut-down of the development costs. In the theoretical part of the article is presented an overview of the augmented reality application structure. Further, an approach for selection appropriate library as well as the review of the existing software libraries focused in this area is described. The last part of the article outlines our implementation of key parts of the augmented reality application using the OpenCV library.
Regularization of Legendre Function Series for Charged Particles Improved Nearside-Farside Subamplitudes
R. Anni
Physics , 2002, DOI: 10.1103/PhysRevC.67.057601
Abstract: A simple regularization procedure is proposed for the Legendre function series of improved nearside-farside subamplitudes for charged particles elastic scattering. The procedure is the extension of the usual one which defines the partial wave series for the scattering amplitude in the presence of a long range Coulomb term in the potential, and it provides the same convergence rate.
Airy-like patterns in heavy ion elastic scattering
R. Anni
Physics , 2000, DOI: 10.1103/PhysRevC.63.031601
Abstract: A semiclassical analysis of an optical potential cross section is presented. The cross section considered is characterized by the appearance of an Airy-like pattern. This pattern is similar to that which is present in many cross sections, which fit the recent measurements of light heavy ion elastic scattering, and is considered as a manifestation of a rainbow phenomenon. The semiclassical analysis shows that, in the case considered, the oscillations arise from the interference between the contributions from two different terms of a multi-reflection expansion of the scattering function, and, therefore, cannot be associated with the rainbow phenomenon.
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