1,050 research outputs found

    Q-instantons

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    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

    p-Branes, D-Branes and M-Branes

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    We consider solutions to the string effective action corresponding to p-Branes, D-Branes and M-Branes and discuss some of their properties.Comment: 8 pages, latex, uses sprocl.sty; talk given at the Workshop on Gauge Theories, Applied Supersymmetry and Quantum Gravity (London, July 1996) and the Strings '96 conference, ``Current Trends in String Theory'' (Santa Barbara, July 1996

    Domain Walls on the Brane

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    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

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

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

    IIA/IIB Supergravity and Ten-forms

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    We perform a careful investigation of which p-form fields can be introduced consistently with the supersymmetry algebra of IIA and/or IIB ten-dimensional supergravity. In particular the ten-forms, also known as "top-forms", require a careful analysis since in this case, as we will show, closure of the supersymmetry algebra at the linear level does not imply closure at the non-linear level. Consequently, some of the (IIA and IIB) ten-form potentials introduced in earlier work of some of us are discarded. At the same time we show that new ten-form potentials, consistent with the full non-linear supersymmetry algebra can be introduced. We give a superspace explanation of our work. All of our results are precisely in line with the predictions of the E(11) algebra.Comment: 17 page

    Spectrum of Higher Derivative 6D Chiral Supergravity

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    Gauged off-shell Maxwell-Einstein supergravity in six dimensions with N=(1,0) supersymmetry has a higher derivative extension afforded by a supersymmetrized Riemann squared term. This theory admits a supersymmetric Minkowski x S^2 compactification with a U(1) monopole of unit charge on S^2. We determine the full spectrum of the theory on this background. We also determine the spectrum on a non-supersymmetric version of this compactification in which the monopole charge is different from unity, and we find the peculiar feature that there are massless gravitini in a representation of the S^2 isometry group determined by the monopole charge.Comment: typos correcte

    Solitons on the Supermembrane

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    Energy bounds are derived for planar and compactified M2-branes in a hyper-K\"ahler background. These bounds are saturated, respectively, by lump and Q-kink solitons, which are shown to preserve a half of the worldvolume supersymmetry. The Q-kinks have a dual IIB interpretation as strings that migrate between fivebranes.Comment: 18 pp. Latex; v2: minor corrections, version as published in JHE

    N=2\ WW-supergravity

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    We quantise the classical gauge theory of N=2 wN=2\ w_\infty-supergravity and show how the underlying N=2N=2 super-ww_\infty algebra gets deformed into an N=2N=2 super-WW_\infty algebra. Both algebras contain the N=2N=2 super-Virasoro algebra as a subalgebra. We discuss how one can extract from these results information about quantum N=2 WNN=2\ W_N-supergravity theories containing a finite number of higher-spin symmetries with superspin sNs\le N. As an example we discuss the case of quantum N=2 W3N=2\ W_3-supergravity.Comment: 44 page

    Type II Duality Symmetries in Six Dimensions

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    We discuss the different discrete duality symmetries in six dimensions that act within and between (i) the 10-dimensional heterotic string compactified on T4T^4, (ii) the 10-dimensional Type IIA string compactified on K3K3 and (iii) the 10-dimensional Type IIB string compactified on K3K3. In particular we show that the underlying group-theoretical structure of these discrete duality symmetries is determined by the proper cubic group C/Z2{\cal C}/\Z_2. Our group theoretical interpretation leads to simple rules for constructing the explicit form of the different discrete Type II duality symmetries in an arbitrary background. The explicit duality rules we obtain are applied to construct dual versions of the 6-dimensional chiral null model.Comment: 31 pages, 6 figures, epsfig.sty, late
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