Showing papers on "Higher-dimensional supergravity published in 2005"
TL;DR: In this paper, the authors explicitly compute the two-point correlation function of the boundary stress energy tensor in a large class of type IIB supergravity backgrounds with a regular translationally invariant horizon.
247 citations
TL;DR: It is shown that such flux vacua exist when the internal geometry is nearly Kähler, and the four-dimensional cosmological constant, while negative, becomes small in the vacuum with the weak string coupling.
Abstract: We derive conditions for the existence of four-dimensional N =1 supersymmetric flux vacua of massive type IIA string theory with general supergravity fluxes turned on. For an SU(3) singlet Killing spinor, we show that such flux vacua exist only when the internal geometry is nearly-Kahler. The geometry is not warped, all the allowed fluxes are proportional to the mass parameter and the dilaton is fixed by a ratio of (quantized) fluxes. The four-dimensional cosmological constant, while negative, becomes small in the vacuum with the weak string coupling. Insights into four-dimensional N = 1 supersymmetric vacua of M- and string theory with non-Abelian gauge sectors and chiral matter are of phenomenological inter- est: they may provide an important link between the M-theory and particle physics, describing the Standard Model and/or Grand Unified models. In particular, in- tersecting D6-brane constructions (1, 2) on Type IIA ori- entifolds provide a intriguing avenue to construct semi- realistic particle physics. (For a recent review see (3) and references therein; for first examples of N =1 supersym- metric quasi-realistic models see (4, 5)) On the other hand more general compactifications of string theory in the presence of supergravity fluxes can lift the continuous moduli space of string vacua, while still preserving some supersymmetries and hence might be an essential input in realistic compactifications of string/M-theory. These fluxes generate a back reaction onto the geometry, which in the simplest case results in a non-trivial warping, but in general the internal space ceases to be Calabi-Yau. Unfortunately, the explicit met- ric and fluxes are known only for very few examples. One of the important phenomenological goals in the constructions of general N=1 supersymmetric vacua is the implementation of (supergravity) flux compactifica- tions, which would yield the moduli stabilization, along with the (probe) D-brane configurations, which would yield the non-Abelian gauge group structure and chi- ral matter in four-dimensions. On one hand, a better understanding of the resulting internal geometry can be achieved by relating the fluxes to specific non-trivial tor- sion components, which can be classified with respect to the structure group of the internal manifold, for a recent review see (6). The Killing spinor has to be a singlet un- der the structure group which for a six-dimensional space is at most SU(3). (However non-zero fluxes often require a reduction of the structure group down to SU(2).) It
203 citations
TL;DR: In this paper, the authors revisited and complete the study of curved BPS-domain walls in matter-coupled $5D, $\mathcal{N} = 2$ supergravity and carefully analyzed the relation to gravitational theories known as ''fake supergravities''.
Abstract: We revisit and complete the study of curved BPS-domain walls in matter-coupled $5D$, $\mathcal{N}=2$ supergravity and carefully analyze the relation to gravitational theories known as ``fake supergravities.'' We first show that curved BPS-domain walls require the presence of nontrivial hypermultiplet scalars, whereas walls that are solely supported by vector multiplet scalars are necessarily flat, due to the constraints from very special geometry. We then recover fake supergravity as the effective description of true supergravity where one restricts the attention to the flowing scalar field of a given BPS-domain wall. In general, however, true supergravity can be simulated by fake supergravity at most locally, based upon two choices: (i) a suitable adapted coordinate system on the scalar manifold, such that only one scalar field plays a dynamical role, and (ii) a gauge fixing of the SU(2) connection on the quaternionic-K\"ahler manifold, as this connection does not fit the simple formalism of fake supergravity. Employing these gauge and coordinate choices, the BPS-equations for both vector and hypermultiplet scalars become identical to the fake supergravity equations, once the line of flow is determined by the full supergravity equations.
108 citations
TL;DR: In this paper, the Kawai, Lewellen and Tye closed-open string relations are used to obtain coefficients of box integrals appearing in one-loop = 8 supergravity amplitudes from the recent computation of coefficients for = 4 super-Yang-Mills non-maximally-helicity-violating amplitudes.
Abstract: At tree-level, gravity amplitudes are obtainable directly from gauge theory amplitudes via the Kawai, Lewellen and Tye closed-open string relations. We explain how the unitarity method allows us to use these relations to obtain coefficients of box integrals appearing in one-loop = 8 supergravity amplitudes from the recent computation of the coefficients for = 4 super-Yang-Mills non-maximally-helicity-violating amplitudes. We argue from factorisation that these box coefficients determine the one-loop = 8 supergravity amplitudes, although this remains to be proven. We also show that twistor-space properties of the = 8 supergravity amplitudes are inherited from the corresponding properties of = 4 super-Yang-Mills theory. We give a number of examples illustrating these ideas.
103 citations
TL;DR: In this article, the classification of 1/4-supersymmetric solutions of five dimensional gauged supergravity coupled to arbitrary many abelian vector multiplets, which was initiated in hep-th/0401129, is completed.
Abstract: The classification of 1/4-supersymmetric solutions of five dimensional gauged supergravity coupled to arbitrary many abelian vector multiplets, which was initiated in hep-th/0401129, is completed. The structure of all solutions for which the Killing vector constructed from the Killing spinor is null is investigated in both the gauged and the ungauged theories and some new solutions are constructed.
91 citations
TL;DR: Recently, Lin, Lunin and Maldacena as mentioned in this paper extended these solutions by invoking additional gauge fields and scalar fields in the supergravity Lagrangians, thereby obtaining AdS bubble generalisations of the previously-known multi-charge AdS black solutions of gauged supergravity.
76 citations
TL;DR: In this article, the authors show that the linear dilaton background is the most general supersymmetric solution without background under the additional requirement of flatness in the string frame, and they also give general solutions for flat spacetime with R-R or NS-NS backgrounds, which are characterized by a single function.
67 citations
TL;DR: In this article, the Killing Spinor Identities (KSI) is used to reduce the number of independent equations of motion that need to be checked explicitly to make sure that a supersymmetric configuration is a classical supergravity solution.
66 citations
TL;DR: In this paper, the authors analyzed the geodesic E 10 / K (E 10 ) σ-model in a level decomposition w.r.t. the A 8 × A 1 subalgebra of E 10, adapted to the bosonic sector of type IIB supergravity, whose SL ( 2, R ) symmetry is identified with the A 1 factor.
64 citations
TL;DR: In this paper, the authors conduct a systematic search for anomaly-free 6D = 1 chiral supergravity theories under a certain set of restrictions on the allowed gauge groups and the representations of the hypermultiplets.
Abstract: We conduct a systematic search for anomaly-free six-dimensional = 1 chiral supergravity theories. Under a certain set of restrictions on the allowed gauge groups and the representations of the hypermultiplets, we enumerate all possible Poincare and gauged supergravities with one tensor multiplet satisfying the 6D anomaly cancellation criteria.
64 citations
TL;DR: In this article, conditions for = 1 and = 2 supersymmetry on manifolds of SU(2) structure were analyzed for a warped product M 1,3 × ωX6, where X6 is a six-dimensional compact manifold and M1,3 is AdS4 or a four-dimensional Minkowski space.
Abstract: We consider backgrounds of (massive) IIA supergravity of the form of a warped product M1,3 × ωX6, where X6 is a six-dimensional compact manifold and M1,3 is AdS4 or a four-dimensional Minkowski space. We analyse conditions for = 1 and = 2 supersymmetry on manifolds of SU(2) structure. We prove the absence of solutions in certain cases.
TL;DR: In this paper, it was shown that Supergravity in eleven dimensions can be described in terms of a constrained superfield on the light-cone, without the use of auxiliary fields.
Abstract: We show that Supergravity in eleven dimensions can be described in terms of a constrained superfield on the light-cone, without the use of auxiliary fields. We build its action to first order in the gravitational coupling constant \kappa, by "oxidizing" (N=8,d=4) Supergravity. This is simply achieved, as for N=4 Yang-Mills, by extending the transverse derivatives into superspace. The eleven-dimensional SuperPoincare algebra is constructed and a fourth order interaction is conjectured.
CERN1
TL;DR: In this article, the cubic interaction of IIB string theory in the maximally supersymmetric pp-wave background was revisited and a new cubic vertex was proposed, which combines the previous proposals and contains additional terms.
TL;DR: In this paper, the authors considered eleven-dimensional supergravity on a manifold with boundary and the theories related to low energy heterotic M-theory, in which the matter is confined to the boundary.
04 May 2005
TL;DR: In this paper, the authors review the current status of the construction of unitary representations of U-duality groups of supergravity theories in five, four and three dimensions, focusing mainly on the maximal N = 8 super gravity theories and on the N = 2 Maxwell-Einstein supergravity (MESGT) theories defined by Jordan algebras of degree three in five dimensions and their descendants in 4 and 3 dimensions.
Abstract: We review the current status of the construction of unitary representations of U-duality groups of supergravity theories in five, four and three dimensions. We focus mainly on the maximal N = 8 supergravity theories and on the N = 2 Maxwell-Einstein supergravity (MESGT) theories defined by Jordan algebras of degree three in five dimensions and their descendants in four and three dimensions. Entropies of the extremal black hole solutions of these theories in five and four dimensions are given by certain invariants of their U-duality groups. The five dimensional U-duality groups admit extensions to spectrum generating generalized conformal groups which are isomorphic to the U-duality groups of corresponding four dimensional theories. Similarly, the U-duality groups of four dimensional theories admit extensions to spectrum generating quasiconformal groups that are isomorphic to the corresponding U-duality groups in three dimensions. For example, the group E8(8) can be realized as a quasiconformal group in the 57 dimensional charge-entropy space of BPS black hole solutions of maximal N = 8 supergravity in four dimensions and leaves invariant 'lightlike separations' with respect to a quartic norm. Similarly E7(7) acts as a generalized conformal group in the 27 dimensional charge space of BPS black hole solutions inmore » five dimensional N = 8 supergravity and leaves invariant 'lightlike separations' with respect to a cubic norm. For the exceptional N 2 Maxwell-Einstein supergravity theory the corresponding quasiconformal and conformal groups are E8(-24) and E7(-25), respectively. We outline the oscillator construction of the unitary representations of generalized conformal groups that admit positive energy representations, which include the U-duality groups of N = 2 MESGT's in four dimensions . We conclude with a review of the minimal unitary realizations of U-duality groups that are obtained by quantizations of their quasiconformal actions and discuss in detail the minimal unitary realization of E8(8)« less
TL;DR: In this article, the authors consider the properties of the first order supergravity action with a composite A3 field and find the set of extra gauge symmetries that guarantee that the field theoretical degrees of freedom of the theory remain the same as with a fundamental A3.
TL;DR: In this paper, a new anomaly-free supergravity model in six dimensions was presented, which admits monopole compactifications to 4 × S2, leading to D = 4 effective theories with broken supersymmetry and massless fermions.
Abstract: We present a new anomaly-free gauged = 1 supergravity model in six dimensions. The gauge group is E7 × G2 × U(1)R, with all hyperinos transforming in the product representation (56,14). The theory admits monopole compactifications to 4 × S2, leading to D = 4 effective theories with broken supersymmetry and massless fermions.
TL;DR: In this article, a simple non-renormalization theorem for a broad class of Type IIB vacua using the known symmetries of these compactifications was provided, which put them on a similar footing as the better-known nonrenormalisation theorems of heterotic vacua without fluxes.
Abstract: Recent progress in understanding modulus stabilization in string theory relies on the existence of a non-renormalization theorem for the 4D compactifications of Type IIB supergravity which preserve N=1 supersymmetry. We provide a simple proof of this non-renormalization theorem for a broad class of Type IIB vacua using the known symmetries of these compactifications, thereby putting them on a similar footing as the better-known non-renormalization theorems of heterotic vacua without fluxes. The explicit dependence of the tree-level flux superpotential on the dilaton field makes the proof more subtle than in the absence of fluxes.
TL;DR: In this paper, the authors studied curved and flat Bogomol'nyi-Prasad-Sommerfield (BPS)-domain walls in 5D, N=4 gauged supergravity and showed that their effective dynamics along the flow is described by a generalized form of "fake supergravity".
Abstract: We study curved and flat Bogomol'nyi-Prasad-Sommerfield (BPS)-domain walls in 5D, N=4 gauged supergravity and show that their effective dynamics along the flow is described by a generalized form of 'fake supergravity'. This generalizes previous work in N=2 supergravity and might hint towards a universal behavior of gauged supergravity theories in supersymmetric domain wall backgrounds. We show that BPS-domain walls in 5D, N=4 supergravity can never be curved if they are supported by the supergravity scalar only. Furthermore, a purely Abelian gauge group or a purely semisimple gauge group can never lead to a curved domain wall, and the flat walls for these gaugings always exhibit a runaway behavior.
TL;DR: In this article, an on-shell formulation of 5D supergravity coupled to chiral matter multiplets localized at the orbifold fixed points is presented, where the brane action is constructed via the Noether method.
Abstract: We present an on-shell formulation of 5d gauged supergravity coupled to chiral matter multiplets localized at the orbifold fixed points. The brane action is constructed via the Noether method. In such set-up we compute one-loop corrections to the Kahler potential of the effective 4d supergravity and compare the result with previous computations based on the off-shell formalism. The results agree at lowest order in brane sources, however at higher order there are differences. We explain this discrepancy by an ambiguity in resolving singularities associated with the presence of infinitely thin branes.
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TL;DR: The maximal compact subgroup K(E9) of the affine Lie group E9(9) and its on-shell realization as an R symmetry of maximal N = 16 supergravity in two dimensions was studied in this article.
Abstract: We study the maximal compact subgroup K(E9) of the affine Lie group E9(9) and its on-shell realization as an R symmetry of maximal N = 16 supergravity in two dimensions. We first give a rigorous definition of the group K(E9), which lives on the double cover of the spectral parameter plane, and show that the infinitesi mal action of K(E9) on the chiral components of the bosons and the fermions is determined in terms of an expansion of the Lie algebra of K(E9) about the two branch points of this cover; this implies in particular that the fermions of N = 16 supergravity transform in a spinor representation of K(E9). The fermionic equations of motion can be fitted into the lowe st components of a single K(E9) covariant ‘Dirac equation’, with the linear system of N = 16 supergravity as the gauge connection. These results suggest the existence of an ‘off-shell’ realization of K(E9) in terms of an infinite component spinor representation. We c onclude with some coments on ‘generalized holonomies’ of M theory.
TL;DR: It is sufficient to impose the Bianchi identity and one particular component of the four-form field equation to ensure that the solution of the Killing spinor equation also satisfies all the field equations, and it is given explicitly.
Abstract: We derive, for spacetimes admitting a Spin(7) structure, the general local bosonic solution of the Killing spinor equation of 11-dimensional supergravity. The metric, four-form, and Killing spinors are determined explicitly, up to an arbitrary eight-manifold of Spin(7) holonomy. It is sufficient to impose the Bianchi identity and one particular component of the four-form field equation to ensure that the solution of the Killing spinor equation also satisfies all the field equations, and we give these conditions explicitly.
01 Jan 2005
TL;DR: In this paper, the authors review the mechanism of gaugino condensation in the framework of the d = 10 heterotic string and its d = 11 extension of Horava and Witten.
Abstract: We review the mechanism of gaugino condensation in the framework of the d = 10 heterotic string and its d = 11 extension of Horava and Witten. In particular we emphasize the relation between the gaugino condensate and the flux of the antisymmetric tensor fields of higher dimensional supergravity. Its potential role for supersymmetry breakdown and moduli stabilization is investigated.
TL;DR: In this article, the authors constructed the effective supergravity actions for the lowest massive Kaluza-Klein states on the supersymmetric background AdS_3 x S^3 xS^3.
Abstract: We construct the effective supergravity actions for the lowest massive Kaluza-Klein states on the supersymmetric background AdS_3 x S^3 x S^3. In particular, we describe the coupling of the supergravity multiplet to the lowest massive spin-3/2 multiplet which contains 256 physical degrees of freedom and includes the moduli of the theory. The effective theory is realized as the broken phase of a particular gauging of the maximal three-dimensional supergravity with gauge group SO(4) x SO(4). Its ground state breaks half of the supersymmetries leading to 8 massive gravitinos acquiring mass in a super Higgs effect. The holographic boundary theory realizes the large N=(4,4) superconformal symmetry.
TL;DR: In this paper, the authors study the construction of boundary states in the pure spinor formalism for the quantisation of the superstring and propose an explicit expression for the D-brane boundary state in a flat spacetime background.
Abstract: We study the construction of D–brane boundary states in the pure spinor formalism for the quantisation of the superstring. This is achieved both via a direct analysis of the definition of D–brane boundary states in the pure spinor conformal field theory, as well as via comparison between standard RNS and pure spinor descriptions of the superstring. Regarding the map between RNS and pure spinor formulations of the superstring, we shed new light on the tree level zero mode saturation rule. Within the pure spinor formalism we propose an explicit expression for the D–brane boundary state in a flat spacetime background. While the non–zero mode sector mostly follows from a simple understanding of the pure spinor conformal field theory, the zero mode sector requires a deeper analysis which is one of the main points in this work. With the construction of the boundary states at hand, we give a prescription for calculating scattering amplitudes in the presence of a D–brane. Finally, we also briefly discuss the coupling to the world–volume gauge field and show that the D–brane low–energy effective action is correctly reproduced.
Journal Article•
TL;DR: In this paper, the role of spinor fields in the evolution of the universe is studied, and it is shown that the spinor field nonlinearity can generate a negative effective pressure, which can be seen as an alternative source for late time acceleration of the Universe.
Abstract: A self-consistent system of interaction nonlinear spinor and scalar fields within the scope of a BI cosmological model filled with perfect fluid is considered. The role of spinor field in the evolution of the Universe is studied. It is shown that the spinor field nonlinearity can generate a negative effective pressure, which can be seen as an alternative source for late time acceleration of the Universe.
TL;DR: In this paper, the authors complete an earlier derivation of the 4-point bosonic scattering amplitudes and corresponding linearized local supersymmetric invariants in D = 11 supergravity by displaying the form-curvature, F^2R^2, terms.
Abstract: We complete an earlier derivation of the 4-point bosonic scattering amplitudes, and of the corresponding linearized local supersymmetric invariants in D = 11 supergravity, by displaying the form-curvature, F^2R^2, terms.
TL;DR: In this paper, substantial progress has been made in classifying supersymmetric solutions of supergravity theories using G-structures, and the construction of superymmetric black rings that were discovered using the classification of D=5 supergravity solutions.
Abstract: We review the substantial progress that has been made in classifying supersymmetric solutions of supergravity theories using G-structures. We also review the construction of supersymmetric black rings that were discovered using the classification of D=5 supergravity solutions.
TL;DR: In this article, the conditions for supersymmetry in terms of $p$-form spinor bilinear of the supersymmetric parameter were studied. But the results were restricted to the case where the supergravity is reduced to type IIA in ten dimensions.
Abstract: We consider the dimensional reduction of 11D supergravity to type IIA in ten dimensions, and study the conditions for supersymmetry in terms of $p$-form spinor bilinears of the supersymmetry parameter. For a bosonic solution to be supersymmetric these $p$ forms must satisfy a set of differential relations, which we derive in full; the supersymmetry variations of the dilatino give a set of algebraic relations which are also derived. These results are then used to provide the generalized calibration conditions for some of the basic brane solutions, we also follow up a suggestion of Hackett-Jones and Smith and present a calibration condition for IIA supertubes. We find that a probe supertube satisfies this bound but does not saturate it, with the bound successfully accounting for the D0 charge of the supertube but not the string charge; we speculate that there should be a stronger calibration inequality than the one given.