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Träfflista för sökning "WFRF:(Nilsson Bengt E W 1952) "

Sökning: WFRF:(Nilsson Bengt E W 1952)

  • Resultat 1-10 av 52
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1.
  • Nilsson, Bengt E W, 1952, et al. (författare)
  • Topologically gauged superconformal Chern-Simons matter theories.
  • 2012
  • Ingår i: Journal of High Energy Physics. - 1029-8479 .- 1126-6708. ; 1212:12, s. 046-
  • Tidskriftsartikel (refereegranskat)abstract
    • Abstract: By coupling N = 8 superconformal matter to N = 8 superconformal Chern- Simons gravity in three dimensions we obtain theories with novel terms in the scalar po- tential leading to AdS3 solutions and superconformal symmetry breaking. If we start from the theory derived by Bagger, Lambert and Gustavsson, our coupled theory either inherits the SO(4) gauge group or reduces it to SO(3). If the construction is instead based on a free matter theory we find that the gravitational topological gauging also requires the in- troduction of a Chern-Simons gauge sector resulting in a consistent theory for any SO(N) gauge group.
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2.
  • Adawi, Tom, 1970, et al. (författare)
  • Goldstone tensor modes
  • 1998
  • Ingår i: J. High Energy Phys. 9902:001,1999.
  • Tidskriftsartikel (refereegranskat)abstract
    • In the context of brane solutions of supergravity, we discuss a general method to introduce collective modes of any spin by exploiting a particular way of breaking symmetries. The method is applied to the D3, M2 and M5 branes and we derive explicit expressions for how the zero-modes enter the target space fields, verify normalisability in the transverse directions and derive the corresponding field equations on the brane. In particular, the method provides a clear understanding of scalar, spinor, and rank r tensorial Goldstone modes, chiral as well as non-chiral, and how they arise from the gravity, Rarita-Schwinger, and rank r+1 Kalb-Ramond tensor gauge fields, respectively. Some additional observations concerning the chiral tensor modes on the M5 brane are discussed.
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3.
  • Adawi, Tom, 1970, et al. (författare)
  • Superembeddings, nonlinear supersymmetry and five-branes
  • 1997
  • Ingår i: Int.J.Mod.Phys.A13:4691-4716,1998.
  • Tidskriftsartikel (refereegranskat)abstract
    • We examine general properties of superembeddings, i.e., embeddings of supermanifolds into supermanifolds. The connection between an embedding procedure and the method of non-linearly realised supersymmetry is clarified, and we demonstrate how the latter arises as a special case of the former. As an illustration, the super-5-brane in 7 dimensions, containing a self-dual 3-form world-volume field strength, is formulated in both languages, and provides an example of a model where the embedding condition does not suffice to put the theory on-shell.
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4.
  • Bao, Ling, 1980, et al. (författare)
  • A note on topological M5-branes and string-fivebrane duality
  • 2008
  • Ingår i: Journal of High Energy Physics. - 1029-8479 .- 1126-6708. ; :6, s. 11-
  • Tidskriftsartikel (refereegranskat)abstract
    • We derive the stability conditions for the M5-brane in topological M-theory using k-symmetry. The non-linearly self-dual 3-form on the world-volume is necessarily non-vanishing, as is the case also for the 2-form field strengths on coisotropic branes in topological string theory. It is demonstrated that the self-duality is consistent with the stability conditions, which are solved locally in terms of a tensor in the representation 6 of SU(3) subset of G(2). The double dimensional reduction of the M5-brane is the D4-brane, and its direct reduction is an NS5-brane. We show that the equation of motion for the 3-form on the NS5-brane wrapping a Calabi-Yau space is exactly the Kodaira-Spencer equation, providing support for a string-fivebrane duality in topological string theory.
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5.
  • Bao, Ling, 1980, et al. (författare)
  • A Note on Topological M5-branes and String-Fivebrane Duality
  • 2006
  • Tidskriftsartikel (övrigt vetenskapligt)abstract
    • We derive the stability conditions for the M5-brane in topological M-theory using kappa-symmetry. The non-linearly self-dual 3-form on the world-volume is necessarily non-vanishing, as is the case also for the 2-form field strengths on coisotropic branes in topological string theory. It is demonstrated that the self-duality is consistent with the stability conditions, which are solved locally in terms of a tensor in the representation 6 of SU(3) in G_2. The double dimensional reduction of the M5-brane is the D4-brane, and its direct reduction is an NS5-brane. We show that the equation of motion for the 3-form on the NS5-brane wrapping a Calabi-Yau space is exactly the Kodaira-Spencer equation, providing support for a string-fivebrane duality in topological string theory.
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6.
  • Bao, Ling, 1980, et al. (författare)
  • Aspects of higher curvature terms and U-duality
  • 2007
  • Ingår i: Classical and Quantum Gravity. - 0264-9381. ; 25:9
  • Tidskriftsartikel (refereegranskat)abstract
    • We discuss various aspects of dimensional reduction of gravity with theEinstein-Hilbert action supplemented by a lowest order deformation formed asthe Riemann tensor raised to powers two, three or four. In the case of R^2 wegive an explicit expression, and discuss the possibility of extended cosetsymmetries, especially SL(n+1,Z) for reduction on an n-torus to threedimensions. Then we start an investigation of the dimensional reduction of R^3and R^4 by calculating some terms relevant for the coset formulation, aiming inparticular towards E_8(8)/(Spin(16)/Z_2) in three dimensions and aninvestigation of the derivative structure. We emphasise some issues concerningthe need for the introduction of non-scalar automorphic forms in order torealise certain expected enhanced symmetries.
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7.
  • Bao, Ling, 1980, et al. (författare)
  • Membranes for Topological M-Theory
  • 2005
  • Ingår i: Journal of High Energy Physics.
  • Tidskriftsartikel (refereegranskat)abstract
    • We formulate a theory of topological membranes on manifolds with G_2 holonomy. The BRST charges of the theories are the superspace Killing vectors (the generators of global supersymmetry) on the background with reduced holonomy G_2. In the absence of spinning formulations of supermembranes, the starting point is an N=2 target space supersymmetric membrane in seven euclidean dimensions. The reduction of the holonomy group implies a twisting of the rotations in the tangent bundle of the branes with ``R-symmetry'' rotations in the normal bundle, in contrast to the ordinary spinning formulation of topological strings, where twisting is performed with internal U(1) currents of the N=(2,2) superconformal algebra. The double dimensional reduction on a circle of the topological membrane gives the strings of the topological A-model (a by-product of this reduction is a Green-Schwarz formulation of topological strings). We conclude that the action is BRST-exact modulo topological terms and fermionic equations of motion. We discuss the role of topological membranes in topological M-theory and the relation of our work to recent work by Hitchin and by Dijkgraaf et al.
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8.
  • Bao, Ling, 1980, et al. (författare)
  • Rigid Calabi-Yau threefolds, Picard Eisenstein series and instantons
  • 2013
  • Ingår i: Journal of Physics: Conference Series. - 1742-6588 .- 1742-6596. ; 462:1
  • Konferensbidrag (refereegranskat)abstract
    • Type IIA string theory compactified on a rigid Calabi-Yau threefold gives rise to a classical moduli space that carries an isometric action of U(2, 1). Various quantum corrections break this continuous isometry to a discrete subgroup. Focussing on the case where the intermediate Jacobian of the Calabi-Yau admits complex multiplication by the ring of quadratic imaginary integers script O signd, we argue that the remaining quantum duality group is an arithmetic Picard modular group PU(2, 1; script O signd). Based on this proposal we construct an Eisenstein series invariant under this duality group and study its non-Abelian Fourier expansion. This allows the prediction of non-perturbative effects, notably the contribution of D2- and NS5-brane instantons. The present work extends our previous analysis in 0909.4299 which was restricted to the special case of the Gaussian integers script O sign1 = ℤ[i].
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9.
  • Bao, Ling, 1980, et al. (författare)
  • U-Duality and the Compactified Gauss-Bonnet Term
  • 2007
  • Ingår i: Journal of High Energy Physics.
  • Tidskriftsartikel (refereegranskat)abstract
    • We present the complete toroidal compactification of the Gauss-Bonnet Lagrangian from D dimensions to D-n dimensions. Our goal is to investigate the resulting action from the point of view of the "U-duality" symmetry SL(n+1,R) which is present in the tree-level Lagrangian when D-n=3. The analysis builds upon and extends the investigation of the paper [arXiv:0706.1183], by computing in detail the full structure of the compactified Gauss-Bonnet term, including the contribution from the dilaton exponents. We analyze these exponents using the representation theory of the Lie algebra sl(n+1,R) and determine which representation is the relevant one for quadratic curvature corrections. By interpreting the result of the compactification as a leading term in a large volume expansion of an SL(n+1,Z)-invariant action, we conclude that the overall exponential dilaton factor should not be included in the representation structure. As a consequence, all dilaton exponents correspond to weights of sl(n+1,R), which, nevertheless, remain on the positive side of the root lattice.
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10.
  • Bengtsson, Viktor, 1981, et al. (författare)
  • U-duality Covariant Membranes
  • 2004
  • Ingår i: J. High Energy Phys. 0502 (2005) 020.
  • Tidskriftsartikel (refereegranskat)abstract
    • We outline a formulation of membrane dynamics in D=8 which is fully covariant under the U-duality group SL(2,Z) x SL(3,Z), and encodes all interactions to fields in the eight-dimensional supergravity, which is constructed through Kaluza--Klein reduction on T^3. Among the membrane degrees of freedom is an SL(2,R) doublet of world-volume 2-form potentials, whose quantised electric fluxes determine the membrane charges, and are conjectured to provide an interpretation of the variables occurring in minimal representations of U-duality groups. We solve the relevant equations for the action for a restricted class of supergravity backgrounds. Some comments are made on supersymmetry and lower dimensions.
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  • Resultat 1-10 av 52
  • [1]23456Nästa

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