1,131 research outputs found
The Dual Phases of Massless/Massive Kalb-Ramond Fields
We have developed dualization of ordinary and ``Stueckelberg compensated''
massive phase for the Kalb-Ramond theory. The compensated phase allows to study
the interplay between spin jumping and duality. We show that spin jumping is
caused by mass, while gauge symmetry is not necessary for this effect to take
place.Comment: 8pages, non figures, LaTex 2e; accepted for publ. in J.Phys.
Nambu-Goto Strings from SU(N) Born-Infeld model
The spectrum of quenched Yang-Mills theory in the large-N limit displays
strings and higher dimensional extended objects. The effective dynamics of
string-like excitations is encoded into area preserving Schild action. In this
letter, we bridge the gap between SU(N) gauge models and fully
reparametrization invariant Nambu-Goto string models by introducing an extra
matrix degree of freedom in the Yang-Mills action. In the large-N limit this
matrix variable becomes the world-sheet auxiliary field allowing a smooth
transition between the Schild and Nambu-Goto strings. The new improved matrix
model we propose here can be extended to p-branes provided we enlarge the
dimensionality of the target spacetime.Comment: 11pages, no figures, LateX2e; added discussio
Membrane Vacuum as a Type II Superconductor
We study a functional field theory of membranes coupled to a rank--three
tensor gauge potential. We show that gauge field radiative corrections lead to
membrane condensation which turns the gauge field into a {\it massive spin--0
field}. This is the Coleman--Weinberg mechanism for {\it membranes}. An analogy
is also drawn with a type--II superconductor. The ground state of the system
consists of a two--phase medium in which the superconducting background
condensate is ``pierced'' by four dimensional domains, or ``bags'', of non
superconducting vacuum. Bags are bounded by membranes whose physical thickness
is of the order of the inverse mass acquired by the gauge field.Comment: 14 pages, no figures, LaTeX; to be Published on In.J.Mod.Phys.B
Umezawa Memorial Issu
Particle Propagator in Elementary Quantum Mechanics: a New Path Integral Derivation
This paper suggests a new way to compute the path integral for simple quantum
mechanical systems. The new algorithm originated from previous research in
string theory. However, its essential simplicity is best illustrated in the
case of a free non relativistic particle, discussed here, and can be
appreciated by most students taking an introductory course in Quantum
Mechanics. Indeed, the emphasis is on the role played by the {\it entire family
of classical trajectories} in terms of which the path integral is computed
exactly using a functional representation of the Dirac delta-distribution. We
argue that the new algorithm leads to a deeper insight into the connection
between classical and quantum systems, especially those encountered in high
energy physics.Comment: LaTex uses iopams package, 15pages, no figures, in print on Euro.J.of
Phy
Stabilization of Neutral Thin Shells By Gravitational Effects From Electric Fields
We study the properties of a system consisting of an uncharged spherically
symmetric two dimensional extended object which encloses a stationary point
charge placed in the shell's center. We show that there can be a static and
stable configuration for the neutral shell, using only the gravitational field
of the charged source as a stabilizing mechanism. In particular, two types of
shells are studied: a dust shell and a string gas shell. The dynamical
possibilities are also analyzed, including the possibility of child universe
creation.Comment: 5 pages, 1 figur
Effective dynamics of self-gravitating extended objects
We introduce an effective Lagrangian which describes the classical and
semiclassical dynamics of spherically symmetric, self-gravitating objects that
may populate the Universe at large and small (Planck) scale. These include
wormholes, black holes and inflationary bubbles. We speculate that such objects
represent some possible modes of fluctuation in the primordial spacetime foam
out of which our universe was born. Several results obtained by different
methods are encompassed and reinterpreted by our effective approach. As an
example, we discuss: i) the gravitational nucleation coefficient for a pair of
Minkowski bubbles, and ii) the nucleation coefficient of an inflationary vacuum
bubble in a Minkowski backgroundComment: 13 pages, no figures, ReVTe
Fuzzy dimensions and Planck's Uncertainty Principle for p-branes
The explicit form of the quantum propagator of a bosonic p-brane, previously
obtained by the authors in the quenched-minisuperspace approximation, suggests
the possibility of a novel, unified, description of p-branes with different
dimensionality. The background metric that emerges in this framework is a
quadratic form on a Clifford manifold. Substitution of the Lorentzian metric
with the Clifford line element has two far reaching consequences. On the one
hand, it changes the very structure of the spacetime fabric since the new
metric is built out of a Minimum Length below which it is impossible to resolve
the distance between two points; on the other hand, the introduction of the
Clifford line element extends the usual relativity of motion to the case of
Relative Dimensionalism of all p-branes that make up the spacetime manifold
near the Planck scale.Comment: 11 pages, LaTex, no figures; in print on Class.& Quantum Gra
Vacuum Bubbles Nucleation and Dark Matter Production through Gauge Symmetry Rearrangement
Modern particle physics and cosmology support the idea that a background of
invisible material pervades the whole universe, and identify in the cosmic
vacuum the ultimate source of matter-energy, both seen and unseen. Within the
framework of the theory of fundamental relativistic membranes, we suggest a
self-consistent, vacuum energy-driven mechanism for dark matter creation
through gauge symmetry rearrangement.Comment: 22pages, RevTeX, no figures; accepted for publication in Phys.Rev.
Properties of noncommutative axionic electrodynamics
Using the gauge-invariant but path-dependent variables formalism, we compute
the static quantum potential for noncommutative axionic electrodynamics, and
find a radically different result than the corresponding commutative case. We
explicitly show that the static potential profile is analogous to that
encountered in both non-Abelian axionic electrodynamics and in Yang-Mills
theory with spontaneous symmetry breaking of scale symmetry.Comment: 4 pages. To appear in PR
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