23,027 research outputs found
A Comment on Fundamental Strings in M(atrix) Theory
We present a solution of M(atrix) theory describing type IIA fundamental
string. Our construction is based on the central charge of the longitudinal
membrane (= fundamental string), the BPS saturation condition and the relation
between M(atrix) theory and supersymmetric Yang-Mills theory. The fundamental
string corresponds to a photon in supersymmetric Yang-Mills theory.Comment: 11 pages + 2 uuencoded eps figures, LaTeX, errors corrected and
arguments generalize
String junctions on backgrounds with a positively charged orientifold plane
By means of the heterotic/type IIB duality, we study properties of junctions
on backgrounds with a positively charged orientifold seven-plane and D-branes,
which are expected to give seven dimensional Sp(r) gauge theories. We give a
modified BPS condition for the junctions and show that it reproduces the
adjoint representation of the Sp(r) group.Comment: 16 pages + 3 eps figures, LaTeX, a reference adde
A nonstandard construction of direct limit group actions
Manevitz and Weinberger proved that the existence of faithful -Lipschitz
-actions implies the existence of faithful
-Lipschitz -actions. The
-actions were constructed from suitable actions of a
sufficiently large hyperfinite cyclic group
in the sense of nonstandard
analysis. In this paper, we modify their construction, and prove that the
existence of -faithful -Lipschitz -actions implies
the existence of -faithful -Lipschitz -actions. In a similar way, we generalise Manevitz and Weinberger's
result to injective direct limits of torsion groups
D-particle creation on an orientifold plane
We study the propagations of gravitational wave and D-particle on D6-brane
and orientifold 6-plane backgrounds in the M-theory framework. In the case of
orientifold plane, D-particle number is not conserved and gravitational wave
can convert into D-particle. For the simplest case, we calculate its amplitude
numerically.Comment: 10 pages + 3 eps figures, LaTeX, errors corrected and reference adde
Large N vector quantum mechanics and bubbling supertube solutions
We propose a large N vector quantum mechanics as the theory describing a
D-particle probe in bubbling supertube solutions. We compute the effective
action of this quantum mechanics and show that it coincides with the D-particle
action in a certain decoupling limit, up to quadratic order in the velocity.
The angular momentum of the D-particle, including the contribution of the
Poynting vector, is reproduced as the vacuum expectation value of the SU(2)_R
current.Comment: 17pages, PTPTeX; v2: added references; v3: changed TeX style, added
references; v4: minor corrections, added referenc
Branes in type 0/type II duality
We derive relations between type 0 and type II D-brane configurations under
the T-duality suggested by Bergman and Gaberdiel and confirm that the massless
fields on D-branes are identical to those on the dual D-brane configurations.
Furthermore, we discuss dualities of type 0 and type II NS5-branes and find
that the dual of an unwrapped type 0 NS5-brane is a Kaluza-Klein monopole with
non-supersymmetric blow up modes.Comment: 11 pages, 2 figures, explanations added, typos correcte
Supercurrents on Asymmetric Orbifolds
We study -heterotic string on asymmetric orbifolds associated
with semi-simple simply-laced Lie algebras. Using the fact that -model
allows different twists, we present a new N=1 space-time supersymmetric model
whose supercurrent appears from twisted sectors but not untwisted sector.Comment: 7 pages, Latex, KOBE-TH-93-0
- âŠ