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Iliev Ilian T. | Iliev Bozhidar Z. | Iliev Plamen | Iliev Atanas | Iliev M. N. | Iliev I. T. | Iliev I. Kh. | Iliev Valentin Vankov | Iliev I. | Iliev Iliya D.

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Measuring the evaluation and impact of scientific works and their authors

Iliev Bozhidar Z.
27 Nov 2013 physics.soc-ph cs.DL arxiv.org/abs/1311.6948

Problems for evaluation and impact of published scientific works and their authors are discussed. The role of citations in this process is pointed out. Different bibliometric indicators are reviewed in this connection and ways for generation of new bibliometric indices are given. The influence of different circumstances, like self-citations, number of authors, time dependence and publication types, on the evaluation and impact of scientific papers are considered. The repercussion of works citations and their content is investigated in this respect. Attention is paid also on implicit citations which are not covered by the modern bibliometrics but often are reflected in the peer reviews. Some aspects of the Web analogues of citations and new possibilities of the Internet resources in evaluating authors achievements are presented.

Transformation laws of the components of classical and quantum fields and Heisenberg relations

Iliev Bozhidar Z.
28 Mar 2012 math-ph hep-th math.MP quant-ph arxiv.org/abs/1203.6254

The paper recalls and point to the origin of the transformation laws of the components of classical and quantum fields. They are considered from the "standard" and fibre bundle point of view. The results are applied to the derivation of the Heisenberg relations in quite general setting, in particular, in the fibre bundle approach. All conclusions are illustrated in a case of transformations induced by the Poincar\'e group.

A mathematical base for Fibre bundle formulation of Lagrangian Quantum Field Theory

Iliev Bozhidar Z.
19 Oct 2010 math-ph math.MP arxiv.org/abs/1010.3892

The paper contains a differential-geometric foundations for an attempt to formulate Lagrangian (canonical) quantum field theory on fibre bundles. In it the standard Hilbert space of quantum field theory is replace with a Hilbert bundle; the former playing a role of a (typical) fibre of the letter one. Suitable sections of that bundle replace the ordinary state vectors and the operators on the system's Hilbert space are transformed into morphisms of the same bundle. In particular, the field operators are mapped into corresponding field morphisms.

Heisenberg relations in the general case

Iliev Bozhidar Z.
01 Sep 2008 math-ph hep-th math.MP arxiv.org/abs/0809.0174

The Heisenberg relations are derived in a quite general setting when the field transformations are induced by three representations of a given group. They are considered also in the fibre bundle approach. The results are illustrated in a case of transformations induced by the Poincare group.

Ludwig Valentin Lorenz is the discoverer of the "Lorenz gauge"!

Iliev Bozhidar Z.
01 Mar 2008 physics.hist-ph hep-th math-ph math.MP physics.class-ph physics.gen-ph arxiv.org/abs/0803.0047

The letter reminds the historical fact that the known "Lorenz gauge" (or "Lorenz condition/relation") is first mentioned in a written form and named after Ludwig Valentin Lorenz and not by/after Hendrik Antoon Lorentz.

Lagrangian quantum field theory in momentum picture. IV. Commutation relations for free fields

Iliev Bozhidar Z.
01 Apr 2007 hep-th arxiv.org/abs/0704.0066

Possible (algebraic) commutation relations in the Lagrangian quantum theory of free (scalar, spinor and vector) fields are considered from mathematical view-point. As sources of these relations are employed the Heisenberg equations/relations for the dynamical variables and a specific condition for uniqueness of the operators of the dynamical variables (with respect to some class of Lagrangians). The paracommutation relations or some their generalizations are pointed as the most general ones that entail the validity of all Heisenberg equations. The simultaneous fulfillment of the Heisenberg equations and the uniqueness requirement turn to be impossible. This problem is solved via a redefinition of the dynamical variables, similar to the normal ordering procedure and containing it as a special case. That implies corresponding changes in the admissible commutation relations. The introduction of the concept of the vacuum makes narrow the class of the possible commutation relations; in particular, the mentioned redefinition of the dynamical variables is reduced to normal ordering. As a last restriction on that class is imposed the requirement for existing of an effective procedure for calculating vacuum mean values. The standard bilinear commutation relations are pointed as the only known ones that satisfy all of the mentioned conditions and do not contradict to the existing data.

Handbook of normal frames and coordinates

Iliev Bozhidar Z.
01 Oct 2006 math.DG gr-qc math-ph math.MP arxiv.org/abs/math/0610037

The main subject of the book is an up-to-date and in-depth survey of the theory of normal frames and coordinates in differential geometry. The book can be used as a reference manual, review of the existing results and introduction to some new ideas and developments. In the book can be found practically all existing essential results and methods concerning normal frames and coordinates. Most of the results are represented in full detail with full, in some cases new, proofs. All classical results are expanded and generalized in various directions. Theorems of existence, uniqueness and, possibly, holonomicity of the normal frames and coordinates are proved; mostly, the proofs are constructive and some their parts can be used independently for other tasks. Besides published results, their extensions and generalizations, the book contains completely new results which appear for the first time.

Deviation equations and weak equivalence principle in spaces with affine connection

Iliev Bozhidar Z.
01 May 2006 gr-qc arxiv.org/abs/gr-qc/0605008

Some connections between the deviation equations and weak equivalence principle are investigated.

Linear vector fields and exponential law

Iliev Bozhidar Z., Rahula Maido
01 Apr 2006 math.DG math-ph math.MP arxiv.org/abs/math/0604005

The paper is devoted to vector fields on the spaces R^2 and R^3, their flow and invariants. Attention is plaid on the tensor representations of the group GL(2,R) and on fundamental vector fields. The rotation group on R^3 is generalized to rotation groups with arbitrary quadrics as orbits.

Normal frames and linear transports along paths in line bundles. Applications to classical electrodynamics

Iliev Bozhidar Z.
01 Mar 2006 math-ph math.MP arxiv.org/abs/math-ph/0603002

The definitions and some basic properties of the linear transports along paths in vector bundles and the normal frames for them are recalled. The formalism is specified on line bundles and applied to a geometrical description of the classical electrodynamics. The inertial frames for this theory are discussed.