Now showing items 1-20 of 238

  • Contactless electro-reflectance study of interdiffusion in heat-treated GaAs1-xSbx/GaAs single quantum wells 

    Ghosh, S; Arora, BM; Homewood, KP; Gillin, WP; Khreis, OM; Singer, KE (1998-11-02)
    We have studied the interdiffusion process on the group V sublattice in thermally annealed, undoped strained single quantum wells by comparing the results of contactless electro-reflectance spectroscopy with theoretically ...
  • Large-small dualities between periodic collapsing/expanding branes and brane funnels 

    RAMGOOLAM, SK; Papageorgakis, C (Elsevier, 2005-10)
    We consider space and time dependent fuzzy spheres arising in intersections in IIB string theory and collapsing -branes in IIA string theory. In the case of , where the periodic space and time-dependent solutions can be ...
  • Noncommutative geometry, quantum effects and DBI-scaling in the collapse of D0-D2 bound states 

    Papageorgakis, C; Ramgoolam, S; Toumbas, N (IOP Publishing, 2006-01)
    We study fluctuations of time-dependent fuzzy two-sphere solutions of the non-abelian DBI action of D0-branes, describing a bound state of a spherical D2-brane with N D0-branes. The quadratic action for small fluctuations ...
  • On time-dependent collapsing branes and fuzzy odd-dimensional spheres 

    Papageorgakis, C; Ramgoolam, S (World Scientific Publishing Co Pte Ltd, 2006-05)
    We study the time-dependent dynamics of a collection of N collapsing/expanding D0-branes in type IIA string theory. We show that the fuzzy-S3 and S5 provide time-dependent solutions to the matrix model of D0-branes and its ...
  • Big bang and big crunch in matrix string theory 

    Bedford, J; Papageorgakis, C; Rodriguez-Gomez, D; Ward, J (American Physical Society, 2007-02)
    Following the holographic description of linear dilaton null cosmologies with a big bang in terms of matrix string theory put forward by Craps, Sethi, and Verlinde, we propose an extended background describing a universe ...
  • Twistor strings with flavour 

    Bedford, J; Papageorgakis, C; Zoubos, K (IOP Publishing, 2007-11)
    We explore the tree-level description of a class of Script N = 2 UV-finite SYM theories with fundamental flavour within a topological B-model twistor string framework. In particular, we identify the twistor dual of the ...
  • Proceedings of SuperB Workshop VI: New Physics at the Super Flavor Factory 

    Hitlin, DG; Cheng, CH; Asner, DM; Hurth, T; McElrath, B; Shindou, T; Ronga, F; Rama, M; Simi, STG; Robertson, S;... (2008)
    The sixth SuperB Workshop was convened in response to questions posed by the INFN Review Committee, evaluating the SuperB project at the request of INFN. The working groups addressed the capability of a high-luminosity ...
  • D2 to D2 

    Ezhuthachan, B; Mukhi, S; Papageorgakis, C (2008)
    Starting from maximally supersymmetric (2+1)d Yang-Mills theory and using a duality transformation due to de Wit, Nicolai and Samtleben, we obtain the ghost-free Lorentzian 3-algebra theory that has recently been proposed ...
  • M2 to D2 

    Mukhi, S; Papageorgakis, C (IOP Publishing, 2008)
    We examine the recently proposed ``3-algebra'' field theory for multiple M2-branes and show that when a scalar field valued in the 3-algebra develops a vacuum expectation value, the resulting Higgs mechanism has the novel ...
  • M2-branes on M-folds 

    Distler, J; Mukhi, S; Papageorgakis, C; Raamsdonk, MV (2008)
    We argue that the moduli space for the Bagger-Lambert A_4 theory at level k is (R^8 \times R^8)/D_{2k}, where D_{2k} is the dihedral group of order 4k. We conjecture that the theory describes two M2-branes on a Z_{2k} ...
  • The Power of the Higgs Mechanism: Higher-Derivative BLG Theories 

    Ezhuthachan, B; Mukhi, S; Papageorgakis, C (IOP Publishing, 2009)
    We use the novel Higgs mechanism of arXiv:0803.3218 to determine the leading higher-derivative corrections to the Euclidean N = 8 Bagger-Lambert-Gustavsson field theory. The result matches that previously found for Lorentzian ...
  • Fuzzy Killing Spinors and Supersymmetric D4 action on the Fuzzy 2-sphere from the ABJM Model 

    Nastase, H; Papageorgakis, C (IOP Publishing, 2009)
    Our recent construction arXiv:0903.3966 for the fuzzy 2-sphere in terms of bifundamentals, discovered in the context of the ABJM model, is shown to be explicitly equivalent to the usual (adjoint) fuzzy sphere construction. ...
  • First Measurement of $ν_μ$ and $ν_e$ Events in an Off-Axis Horn-Focused Neutrino Beam 

    Adamson, P; Aguilar-Arevalo, AA; Anderson, CE; Bazarko, AO; Bishai, M; Brice, SJ; Brown, BC; Bugel, L; Cao, J; Choudhary, BC;... (American Physical Society, 2009-05)
    We report the first observation of off-axis neutrino interactions in the MiniBooNE detector from the NuMI beamline at Fermilab. The MiniBooNE detector is located 745 m from the NuMI production target, at 110 mrad angle ...
  • The fuzzy S-2 structure of M2-M5 systems in ABJM membrane theories 

    Nastase, H; Papageorgakis, C; Ramgoolam, S (IOP Publishing, 2009-05)
    We analyse the fluctuations of the ground-state/funnel solutions proposed to describe M2-M5 systems in the level-k mass-deformed/pure Chern-Simons-matter ABJM theory of multiple membranes. We show that in the large N limit ...
  • Supersymmetric Wilson Loops in Diverse Dimensions 

    Agarwal, A; Young, D (2009-06-05)
  • Bifundamental Fuzzy 2-Sphere and Fuzzy Killing Spinors 

    Nastase, H; Papageorgakis, C (SIGMA, 2010)
    We review our construction of a bifundamental version of the fuzzy 2-sphere and its relation to fuzzy Killing spinors, first obtained in the context of the ABJM membrane model. This is shown to be completely equivalent to ...
  • Relating U(N)xU(N) to SU(N)xSU(N) Chern-Simons Membrane theories 

    Lambert, N; Papageorgakis, C (Springer, 2010-04)
    By integrating out the U(1)_B gauge field, we show that the U(n)xU(n) ABJM theory at level k is equivalent to a Z_k identification of the (SU(n)xSU(n))/Z_n Chern-Simons theory, but only when n and k are coprime. As a ...
  • Nonabelian (2,0) Tensor Multiplets and 3-algebras 

    Lambert, N; Papageorgakis, C (Springer, 2010-08)
    Using 3-algebras we obtain a nonabelian system of equations that furnish a representation of the (2,0)-supersymmetric tensor multiplet. The on-shell conditions are quite restrictive so that the system can be reduced to ...
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