3,559 research outputs found

### On M-9-branes and their dimensional reductions

The M-9-brane Wess-Zumino action is constructed, and by using it, consistency
of the relation of p-branes for $p \ge 8$, suggested on the basis of
superalgebra, is discussed.Comment: 6 pages, Latex. Contribution to the proceedings of the D.V.Volkov's
memorial conference ``Supersymmetry and Quantum Field Theory'',Kharkov,July
25-29,2000, to be published in Nuclear Physics B Conference Supplement

### A 10-form Gauge Potential and an M-9-brane Wess-Zumino Action in Massive 11D Theory

We discuss some properties of an M-9-brane in ``massive 11D theory'' proposed
by Bergshoeff, Lozano and Ortin. A 10-form gauge potential is consistently
introduced into the massive 11D supergravity, and an M-9-brane Wess-Zumino
action is constructed as that of a gauged $\sigma$-model. Using duality
relations is crucial in deriving the action, which we learn from the study of a
9-form potential in 10D massive IIA theory. A target space solution of an
M-9-brane with a non-vanishing 10-form gauge field is also obtained, whose
source is shown to be the M-9-brane effective action.Comment: 15pages, Latex; in v2 two computational and some typing errors
corrected (one term added to eq.(3.19), coeffifients of the third line of
eq.(3.22) and that of the last term of eq.(3.18) corrected), one paper by
Meessen and Ortin added as ref.2

### Defect Branes

We discuss some general properties of "defect branes", i.e. branes of
co-dimension two, in (toroidally compactified) IIA/IIB string theory. In
particular, we give a full classification of the supersymmetric defect branes
in dimensions 2 < D < 11 as well as their higher-dimensionalstring and M-theory
origin as branes and a set of "generalized" Kaluza-Klein monopoles. We point
out a relation between the generalized Kaluza-Klein monopole solutions and a
particular type of mixed-symmetry tensors. These mixed-symmetry tensors can be
defined at the linearized level as duals of the supergravity potentials that
describe propagating degrees of freedom. It is noted that the number of
supersymmetric defect branes is always twice the number of corresponding
central charges in the supersymmetry algebra.Comment: Latex2e paper, 28 pages, no figures. Footnote adde

### Massive IIA supergravity from the topologically massive D-2-brane

The superfield equations of massive IIA supergravity, in the form of
constraints on the superspace geometry, are shown to be implied by
$\kappa$-symmetry of the topologically massive D-2-brane.Comment: 19 pp. Minor corrections. To appear in PL

### The Kaluza-Klein Monopole in a Massive IIA Background

We construct the effective action of the KK-monopole in a massive Type IIA
background. We follow two approaches. First we construct a massive M-theory
KK-monopole from which the IIA monopole is obtained by double dimensional
reduction. This eleven dimensional monopole contains two isometries: one under
translations of the Taub-NUT coordinate and the other under massive
transformations of the embedding coordinates. Secondly, we construct the
massive T-duality rules that map the Type IIB NS-5-brane onto the massive Type
IIA KK-monopole. This provides a check of the action constructed from eleven
dimensions.Comment: 29 pages, Latex file, 2 figures, typo and reference corrected,
version to appear in Nucl. Phys.

### Brane orbits

We complete the classification of half-supersymmetric branes in toroidally
compactified IIA/IIB string theory in terms of representations of the T-duality
group. As a by-product we derive a last wrapping rule for the space-filling
branes. We find examples of T-duality representations of branes in lower
dimensions, suggested by supergravity, of which none of the component branes
follow from the reduction of any brane in ten-dimensional IIA/IIB string
theory. We discuss the constraints on the charges of half-supersymmetric
branes, determining the corresponding T-duality and U-duality orbits.Comment: 34 pages, 3 figure

### Domain Walls on the Brane

We show that all branes admit worldvolume domain wall solutions. We find one
class of solutions for which the tension of the brane changes discontinuously
along the domain wall. These solutions are not supersymmetric. We argue that
there is another class of domain wall solutions which is supersymmetric. A
particular case concerns supersymmetric domain wall solutions on IIB D-5- and
NS-5-branes.Comment: 18 pages, Tex, uses phyzz

### Q-instantons

We construct the half-supersymmetric instanton solutions that are
electric-magnetically dual to the recently discussed half-supersymmetric
Q7-branes. We call these instantons `Q-instantons'. Whereas the D-instanton is
most conveniently described using the RR axion \chi and the dilaton \phi, the
Q-instanton is most conveniently described using a different set of fields
\chi' and T, where \chi' is an axionic scalar. The real part of the Q-instanton
on-shell action is a function of T and the imaginary part is linear in \chi'.
Discrete shifts of the axion \chi' correspond to PSL(2,Z) transformations that
are of finite order. These are e.g. pure S-duality transformations relating
weak and strongly coupled regimes. We argue that near each orbifold point of
the quantum axion-dilaton moduli space PSL(2,Z)\PSL(2,R)/SO(2) the higher order
R^4 terms in the string effective action contain contributions from an infinite
sum of single multiply-charged instantons with the Q-instantons corresponding
to the orbifold points \tau=i,\rho where \tau is the complex axion-dilaton
field.Comment: 29 pages, 1 figur

### Superconformal Tensor Calculus in Five Dimensions

We present a full superconformal tensor calculus in five spacetime dimensions
in which the Weyl multiplet has 32 Bose plus 32 Fermi degrees of freedom. It is
derived by the dimensional reduction from the 6D superconformal tensor
calculus. We present two types of 32+32 Weyl multiplets, vector multiplet,
linear multiplet, hypermultiplet and nonlinear multiplet. Their superconformal
transformation laws and the embedding and invariant action formulas are given.Comment: 31 pages, LaTeX, PTPTeX style, no figures, typos correcte

### Massive Branes

We investigate the effective worldvolume theories of branes in a background
given by (the bosonic sector of) 10-dimensional massive IIA supergravity
(``massive branes'') and their M-theoretic origin. In the case of the solitonic
5-brane of type IIA superstring theory the construction of the Wess-Zumino term
in the worldvolume action requires a dualization of the massive
Neveu-Schwarz/Neveu-Schwarz target space 2-form field. We find that, in
general, the effective worldvolume theory of massive branes contains new
worldvolume fields that are absent in the massless case, i.e. when the mass
parameter m of massive IIA supergravity is set to zero. We show how these new
worldvolume fields can be introduced in a systematic way. In particular, we
find new couplings between the massive solitonic 5-brane and the target space
background, involving an additional worldvolume 1-form and 6-form. These new
couplings have implications for the anomalous creation of branes. In
particular, when a massive solitonic 5-brane passes through a D8-brane a
stretched D6-brane is created. Similarly, in M-theory we find that when an
M5-brane passes through an M9-brane a stretched Kaluza-Klein monopole is
created. Pairs of massive branes of type IIA string theory can be viewed as the
direct and double dimensional reduction of a single ``massive M-brane'' whose
worldvolume theory is described by a gauged sigma model.Comment: Latex file, 78 pages, 1 eps figure. Typos corrected. Version to be
published in Nuclear Physics

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