Asymmetric Wormholes via Electrically Charged Lightlike Branes (2009)
Guendelman, Eduardo, Kaganovich, Alexander, Nissimov, Emil, Pacheva, Svetlana
We consider a self-consistent Einstein-Maxwell-Kalb-Ramond system in the bulk D=4 space-time interacting with a variable-tension electrically charged lightlike brane. The latter serves both as a...
Non-singular black holes from gravity-matter-brane lagrangians (2009)
Guendelman, Eduardo, Kaganovich, Alexander, Nissimov, Emil, Pacheva, Svetlana
We consider self-consistent coupling of bulk Einstein-Maxwell-Kalb-Ramond system to codimension-one charged lightlike p-brane with dynamical (variable) tension (LL-brane). The latter is described by...
Einstein-Rosen "Bridge" Needs Lightlike Brane Source (2009)
Guendelman, Eduardo, Kaganovich, Alexander, Nissimov, Emil, Pacheva, Svetlana
The Einstein-Rosen "bridge" wormhole solution proposed in the classic paper [1] does not satisfy the vacuum Einstein equations at the wormhole throat. We show that the fully consistent formulation of...
Spherically Symmetric and Rotating Wormholes Produced by Lightlike Branes (2009)
Guendelman, Eduardo, Kaganovich, Alexander, Nissimov, Emil, Pacheva, Svetlana
Lightlike p-branes (LL-branes) with dynamical (variable) tension allow simple and elegant Polyakov-type and dual to it Nambu-Goto-like world-volume action formulations. Here we first briefly describe...
Lightlike Branes as Natural Candidates for Wormhole Throats (2009)
Guendelman, Eduardo, Kaganovich, Alexander, Nissimov, Emil, Pacheva, Svetlana
We first briefly present a consistent world-volume Lagrangian description of lightlike p-branes (LL-branes) in two equivalent forms - a Polyakov-type and a dual to it Nambu-Goto-type formulations....
Lightlike Brane as a Gravitational Source of Misner-Wheeler-Type Wormhole (2008)
Guendelman, Eduardo, Kaganovich, Alexander, Nissimov, Emil, Pacheva, Svetlana
Consistent Lagrangian description of lightlike p-branes (LL-branes) is presented in two equivalent forms - a Polyakov-type formulation and a dual to it Nambu-Goto-type formulation. An important...
Lightlike p-Branes: Mass "Inflation" and Lightlike Braneworlds (2008)
Guendelman, Eduardo, Kaganovich, Alexander, Nissimov, Emil, Pacheva, Svetlana
Lagrangian description of lightlike p-branes is presented in two equivalent forms - a Polyakov-type formulation and a dual to it Nambu-Goto-type formulation. Next, the properties of lightlike brane...
"Mass Inflation" With Lightlike Branes (2007)
Guendelman, Eduardo, Kaganovich, Alexander, Nissimov, Emil, Pacheva, Svetlana
We discuss properties of a new class of p-brane models, describing intrinsically lightlike branes for any world-volume dimension, in various gravitational backgrounds of interest in the context of...
Guendelman, Eduardo, Kaganovich, Alexander, Nissimov, Emil, Pacheva, Svetlana
We propose a new class of p-brane models describing intrinsically lightlike branes in any world-volume dimensions. Properties of the dynamics of these lightlike p-branes in various gravitational...
Weyl-Invariant Lightlike Branes and Soldering of Black Hole Space-Times (2006)
Guendelman, Eduardo, Kaganovich, Alexander, Nissimov, Emil, Pacheva, Svetlana
We consider self-consistent coupling of the recently introduced new class of Weyl-conformally invariant lightlike branes (WILL-branes) to D=4 Einstein-Maxwell system plus a D=4 three-index...
Large N Expansion. Vector Models (2006)
Nissimov, Emil, Pacheva, Svetlana
Preliminary version of a contribution to the "Quantum Field Theory. Non-Perturbative QFT" topical area of "Modern Encyclopedia of Mathematical Physics" (SELECTA), eds. Aref'eva I, and Sternheimer D,...
Self-Consistent Solutions for Bulk Gravity-Matter Systems Coupled to Lightlike Branes (2006)
Guendelman, Eduardo, Kaganovich, Alexander, Nissimov, Emil, Pacheva, Svetlana
We study self-consistent D=4 gravity-matter systems coupled to a new class of Weyl-conformally invariant lightlike branes (WILL}-branes). The latter serve as material and charged source for gravity...
Weyl-Conformally Invariant p-Brane Theories (2005)
Guendelman, Eduardo, Kaganovich, Alexander, Nissimov, Emil, Pacheva, Svetlana
We discuss in some detail the properties of a novel class of Weyl-conformally invariant p-brane theories which describe intrinsically light-like branes for any odd world-volume dimension and whose...
New Physics From A Dynamical Volume Element (2004)
Guendelman, Eduardo, Kaganovich, Alexander, Nissimov, Emil, Pacheva, Svetlana
The use in the action integral of a volume element of the form $\Phi d^{D}x$ where $\Phi$ is a metric independent measure can give new interesting results in all types of known generally coordinate...
Novel Aspects in p-Brane Theories: Weyl-Invariant Light-Like Branes (2004)
Guendelman, Eduardo, Kaganovich, Alexander, Nissimov, Emil, Pacheva, Svetlana
We consider a novel class of Weyl-conformally invariant p-brane theories which describe intrinsically light-like branes for any odd world-volume dimension, hence the acronym WILL-branes...
Weyl-Invariant Light-Like Branes and Black Hole Physics (2004)
Guendelman, Eduardo, Kaganovich, Alexander, Nissimov, Emil, Pacheva, Svetlana
We propose a new class of p-brane theories which are Weyl-conformally invariant for any p. For any odd world-volume dimension the latter describe intrinsically light-like branes, hence the name...
Strings, p-Branes and Dp-Branes With Dynamical Tension (2003)
Guendelman, Eduardo, Kaganovich, Alexander, Nissimov, Emil, Pacheva, Svetlana
We discuss a new class of brane models (extending both p-brane and Dp-brane cases) where the brane tension appears as an additional dynamical degree of freedom instead of being put in by hand as an...
String and Brane Tensions as Dynamical Degrees of Freedom (2002)
Guendelman, Eduardo, Kaganovich, Alexander, Nissimov, Emil, Pacheva, Svetlana
We discuss a new class of string and p-brane models where the string/brane tension appears as an additional dynamical degree of freedom instead of being introduced by hand as an ad hoc dimensionfull...
String and Brane Models with Spontaneously/Dynamically Induced Tension (2002)
Guendelman, Eduardo, Kaganovich, Alexander, Nissimov, Emil, Pacheva, Svetlana
We study in some detail the properties of a previously proposed new class of string and brane models whose world-sheet (world-volume) actions are built with a modified reparametrization-invariant...
Properties of Supersymmetric Integrable Systems of KP Type (2001)
Nissimov, Emil, Pacheva, Svetlana
The recently proposed supersymmetric extensions of reduced Kadomtsev-Petviashvili (KP) integrable hierarchies in $N =1,2$ superspace are shown to contain in the purely bosonic limit new types of...
Nissimov, Emil, Pacheva, Svetlana
We study additional non-isospectral symmetries of constrained (reduced) N=2 supersymmetric KP hierarchies of integrable ``soliton''-like evolution equations. These symmetries are shown to form an...
Symmetries of Supersymmetric Integrable Hierarchies of KP Type (2001)
Nissimov, Emil, Pacheva, Svetlana
This paper is devoted to the systematic study of additional (non- isospectral) symmetries of constrained (reduced) supersymmetric integrable hierarchies of KP type- the so called SKP_(R;M_B,M_F)...
Gauging of Geometric Actions and Integrable Hierarchies of KP Type (2000)
Nissimov, Emil, Pacheva, Svetlana
This work consist of two interrelated parts. First, we derive massive gauge-invariant generalizations of geometric actions on coadjoint orbits of arbitrary (infinite-dimensional) groups $G$ with...
Aratyn, Henrik, Nissimov, Emil, Pacheva, Svetlana
We show that any multi-component matrix KP hierarchy is equivalent to the standard one-component (scalar) KP hierarchy endowed with a special infinite set of abelian additional symmetries, generated...
Composite Vector and Tensor Gauge Fields, and Volume-Preserving Diffeomorphisms (1999)
Guendelman, Eduardo I., Nissimov, Emil, Pacheva, Svetlana
We describe new theories of composite vector and tensor (p-form) gauge fields made out of zero-dimensional constituent scalar fields (``primitives''). The local gauge symmetry is replaced by an...
String Theory and Integrable Systems (1993)
Nissimov, Emil, Pacheva, Svetlana
This is mainly a brief review of some key achievements in a `hot'' area of theoretical and mathematical physics. The principal aim is to outline the basic structures underlying {\em integrable}...
$\bf W_\infty$ Gravity - a Geometric Approach (1992)
Nissimov, Emil, Pacheva, Svetlana
A brief review is given of an adaptation of the coadjoint orbit method appropriate for study of models with infinite-dimensional symmetry groups. It is illustrated on several examples, including...