507 research outputs found
S-Duality in Gauge Theories as a Canonical Transformation
We show that S-duality in four dimensional non-supersymmetric abelian gauge
theories can be formulated as a canonical transformation in the phase space of
the theory. This transformation is the usual interchange between electric and
magnetic degrees of freedom. It is shown that in phase space the modular
anomaly emerges as the result of integrating out the momenta degrees of
freedom. The generalization to d dimensional abelian gauge theories of p forms
is also considered. In the case of non-abelian gauge theories a careful
analysis of the constraints implied by the canonical transformation shows that
it does not relate Yang-Mills theories with inverted couplings. In fact the
dual theory is shown to be of Freedman- Townsend's type, also with , .Comment: 13 pages, latex file, important changes in the non-abelian case. Some
references adde
Brane Actions and String Dualities
An effective action for the M9-brane is proposed. We study its relation with
other branes via dualities. Among these, we find actions for branes which are
not suggested by the central charges of the Type II superalgebras.Comment: 11 pages, LaTeX, 1 figure; To be published in the proceedings of the
TMR-meeting "Quantum Aspects of Gauge Theories, Supersymmetry and
Unification", Corfu, Greece, September 199
Type II Branes from Brane-Antibrane in M-theory
We discuss in a systematic way all the possible realisations of branes of M
and type II theories as topological solitons of a brane-antibrane system. The
classification of all the possibilities, consistent with the structure of the
theory, is achieved by studying the Wess-Zumino terms in the worldvolume
effective actions of the branes of M-theory and their reductions.Comment: 19 pages, LaTeX file no figure
S-Duality and Brane Descent Relations
We present a description of the type IIB NS-NS p-branes in terms of
topological solitons in systems of spacetime-filling brane-antibrane pairs.
S-duality implies that these spacetime-filling branes are NS9-branes, S-dual to
the D9-branes of the type IIB theory. The possible vortex-like solutions in an
NS9,anti-NS9 configuration are identified by looking at its worldvolume
effective action. Finally we discuss the implications of these constructions in
the description of BPS and non-BPS states in the strongly coupled Heterotic
SO(32) theory.Comment: 14 pages, LaTeX file, no figures, final version to appear in JHE
Exotic Branes and Nonperturbative Seven Branes
We construct the effective action of certain exotic branes in the Type II
theories which are not predicted by their spacetime supersymmetry algebras. We
analyze in detail the case of the NS-7B brane, S-dual to the D7-brane, and
connected by T-duality to other exotic branes in Type IIA: the KK-6A brane and
the KK-8A brane (obtained by reduction of the M-theory Kaluza-Klein monopole
and M9-brane, respectively). The NS-7B brane carries charge with respect to the
S-dual of the RR 8-form, which we identify as a non-local combination of the
electric-magnetic duals of the axion and the dilaton. The study of its
effective action agrees with previous results in the literature showing that it
transforms as an SL(2,Z) triplet together with the D7-brane. We discuss why
this brane is not predicted by the Type IIB spacetime supersymmetry algebra. In
particular we show that the modular transformation relating the D7 and NS-7B
brane solutions can be undone by a simple coordinate transformation in the two
dimensional transverse space, equivalent to choosing a different region to
parametrize the SL(2,Z) moduli space. We discuss a similar relation between the
D6 and KK-6A branes and the D8 and KK-8A branes.Comment: 42 pages, Latex, 1 figur
A new AdS_4/CFT_3 Dual with Extended SUSY and a Spectral Flow
We construct a new AdS_4 background in Type IIB supergravity by means of a
non-Abelian T-duality transformation on the Type IIA dual of ABJM. The analysis
of probe and particle-like branes suggests a dual CFT in which each of the
gauge groups is doubled. A common feature of non-Abelian T-duality is that in
the absence of any global information coming from String Theory it gives rise
to non-compact dual backgrounds, with coordinates living in the Lie algebra of
the Lie group involved in the dualization. In backgrounds with CFT duals this
poses obvious problems to the CFTs. In this paper we show that for the new
AdS_4 background the gauge groups of the associated dual CFT undergo a spectral
flow as the non-compact internal direction runs from 0 to infinity, which
resembles Seiberg duality in N=1. This phenomenon, very reminiscent of the
cascade, provides an interpretation in the CFT for the running of the
non-compact coordinate, and suggests that at the end of the flow the extra
charges disappear and the dual CFT is described by a 2-node quiver very similar
to ABJM, albeit with reduced supersymmetry.Comment: 40 pages, published versio
A giant graviton genealogy
In this article we extend the construction of giant gravitons from
holomorphic surfaces [arXiv:hep-th/0010206] to the ABJM correspondence. We
construct a new class of 1/6-BPS M5-branes wrapping 5-manifolds in S^7/Z_k and
supported by a large angular momentum in the orbifold space. These orbifold
giant gravitons undergo a supersymmetry enhancement to 1/3-BPS and 1/2-BPS
configurations in special cases. The compactification of M-theory on AdS_4 x
S^7/Z_k to type IIA superstring theory on AdS_4 x CP^3 then gives rise to
another new class of 1/6-BPS D4 and NS5-branes wrapping 4 and 5-manifolds in
CP^3. The D4-branes carry a combination of D0-brane charge and angular momentum
in the complex projective space, while the NS5-branes are supported only by
D0-brane charge. Finally, we present a detailed analysis of a one-parameter
family of 1/2-BPS M5-brane orbifold giant gravitons, and their D4 and NS5-brane
CP^3 descendants.Comment: 34 pages; 1 figure; minor revisions; references adde
Charged Particle-like Branes in ABJM: A Summary
We study the effect of adding lower dimensional brane charges to the 't Hooft
monopole, di-baryon and baryon vertex configurations in AdS_4 x CP^3. We show
that these configurations capture the background fluxes in a way that depends
on the induced charges, requiring additional fundamental strings to cancel the
worldvolume tadpoles. The dynamics reveal that the charges must lie inside some
interval, a situation familiar from the baryon vertex in AdS_5 x S^5 with
charges. For the baryon vertex and the di-baryon the number of fundamental
strings must also lie inside an allowed interval. Some ideas about the
existence of these bounds in relation to the stringy exclusion principle are
given.Comment: 6 pages. Contribution to the proceedings of the XVIth European
Workshop on String Theory, Madrid, Spain, June 14-18 2010; based on a talk
given by N. Gutierre
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