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Universal Entanglement Entropy in 2D Conformal Quantum Critical Points

Description: We study the scaling behavior of the entanglement entropy of two dimensional conformal quantum critical systems, i.e. systems with scale invariant wave functions. They include two-dimensional generalized quantum dimer models on bipartite lattices and quantum loop models, as well as the quantum Lifshitz model and related gauge theories. We show that, under quite general conditions, the entanglement entropy of a large and simply connected sub-system of an infinite system with a smooth boundary ha… more
Date: December 5, 2008
Creator: Hsu, Benjamin; Mulligan, Michael; Fradkin, Eduardo & Kim, Eun-Ah
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Partner: UNT Libraries Government Documents Department
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Effective Field Theory of Fractional Quantized Hall Nematics

Description: We present a Landau-Ginzburg theory for a fractional quantized Hall nematic state and the transition to it from an isotropic fractional quantum Hall state. This justifies Lifshitz-Chern-Simons theory - which is shown to be its dual - on a more microscopic basis and enables us to compute a ground state wave function in the symmetry-broken phase. In such a state of matter, the Hall resistance remains quantized while the longitudinal DC resistivity due to thermally-excited quasiparticles is anisot… more
Date: June 6, 2012
Creator: Mulligan, Michael; /MIT, LNS; Nayak, Chetan; /Station Q, UCSB; Kachru, Shamit & /Stanford U., Phys. Dept. /SLAC
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Partner: UNT Libraries Government Documents Department
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Adventures in Holographic Dimer Models

Description: We abstract the essential features of holographic dimer models, and develop several new applications of these models. Firstly, semi-holographically coupling free band fermions to holographic dimers, we uncover novel phase transitions between conventional Fermi liquids and non-Fermi liquids, accompanied by a change in the structure of the Fermi surface. Secondly, we make dimer vibrations propagate through the whole crystal by way of double trace deformations, obtaining nontrivial band structure.… more
Date: August 12, 2011
Creator: Kachru, Shamit; /Stanford U., Phys. Dept. /SLAC; Karch, Andreas; /Washington U., Seattle; Yaida, Sho & /Stanford U., Phys. Dept.
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Partner: UNT Libraries Government Documents Department
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Superpotentials for Quiver Gauge Theories

Description: We compute superpotentials for quiver gauge theories arising from marginal D-Brane decay on collapsed del Pezzo cycles S in a Calabi-Yau X. This is done using the machinery of A{sub {infinity}} products in the derived category of coherent sheaves of X, which in turn is related to the derived category of S and quiver path algebras. We confirm that the superpotential is what one might have guessed from analyzing the moduli space, i.e., it is linear in the fields corresponding to the Exts of the q… more
Date: June 10, 2005
Creator: Aspinwall, Paul S.; /Stanford U., Phys. Dept. /SLAC /Duke U., CGTP; Fidkowski, Lukasz M. & /Stanford U., Phys. Dept.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A New Theory of Anyons

Description: No Description Available.
Date: March 8, 2013
Creator: Fitzpatrick, A.Liam; /Stanford U., ITP; Kachru, Shamit; /Stanford U., ITP /SLAC; Kaplan, Jared; /SLAC et al.
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Partner: UNT Libraries Government Documents Department
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Towards a Holographic Marginal Fermi Liquid

Description: We present an infinite class of 2+1 dimensional field theories which, after coupling to semi-holographic fermions, exhibit strange metallic behavior in a suitable large N limit. These theories describe lattices of hypermultiplet defects interacting with parity-preserving supersymmetric Chern-Simons theories with U(N) x U(N) gauge groups at levels {+-}k. They have dual gravitational descriptions in terms of lattices of probe M2 branes in AdS{sub 4} x S{sup 7}/Z{sub k} (for N >> 1,N >&gt… more
Date: August 15, 2011
Creator: Jensen, Kristan; Kachru, Shamit; Karch, Andreas; Polchinski, Joseph & Silverstein, Eva
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Partner: UNT Libraries Government Documents Department
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Topological Field Theory of Time-Reversal Invariant Insulators

Description: We show that the fundamental time reversal invariant (TRI) insulator exists in 4 + 1 dimensions, where the effective field theory is described by the 4 + 1 dimensional Chern-Simons theory and the topological properties of the electronic structure is classified by the second Chern number. These topological properties are the natural generalizations of the time reversal breaking (TRB) quantum Hall insulator in 2 + 1 dimensions. The TRI quantum spin Hall insulator in 2 + 1 dimensions and the topol… more
Date: March 19, 2010
Creator: Qi, Xiao-Liang; Hughes, Taylor & Zhang, Shou-Cheng
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Partner: UNT Libraries Government Documents Department
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Topological Symmetry, Spin Liquids and CFT Duals of Polyakov Model with Massless Fermions

Description: We prove the absence of a mass gap and confinement in the Polyakov model with massless complex fermions in any representation of the gauge group. A U(1){sub *} topological shift symmetry protects the masslessness of one dual photon. This symmetry emerges in the IR as a consequence of the Callias index theorem and abelian duality. For matter in the fundamental representation, the infrared limits of this class of theories interpolate between weakly and strongly coupled conformal field theory (CFT… more
Date: April 30, 2008
Creator: Unsal, Mithat
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Boundary Entropy Can Increase Under Bulk RG Flow

Description: The boundary entropy log(g) of a critical one-dimensional quantum system (or two-dimensional conformal field theory) is known to decrease under renormalization group (RG) flow of the boundary theory. We study instead the behavior of the boundary entropy as the bulk theory flows between two nearby critical points. We use conformal perturbation theory to calculate the change in g due to a slightly relevant bulk perturbation and find that it has no preferred sign. The boundary entropy log(g) can t… more
Date: October 30, 2007
Creator: Green, Daniel; Mulligan, Michael & Starr, David
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Partner: UNT Libraries Government Documents Department
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2d Affine XY-Spin Model/4d Gauge Theory Duality and Deconfinement

Description: We introduce a duality between two-dimensional XY-spin models with symmetry-breaking perturbations and certain four-dimensional SU(2) and SU(2) = Z{sub 2} gauge theories, compactified on a small spatial circle R{sup 1,2} x S{sup 1}, and considered at temperatures near the deconfinement transition. In a Euclidean set up, the theory is defined on R{sup 2} x T{sup 2}. Similarly, thermal gauge theories of higher rank are dual to new families of 'affine' XY-spin models with perturbations. For rank t… more
Date: August 16, 2012
Creator: Anber, Mohamed M.; Poppitz, Erich; U., /Toronto; Unsal, Mithat & /SLAC /Stanford U., Phys. Dept. /San Francisco State U.
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Partner: UNT Libraries Government Documents Department
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Self-accelerating Warped Braneworlds

Description: Braneworld models with induced gravity have the potential to replace dark energy as the explanation for the current accelerating expansion of the Universe. The original model of Dvali, Gabadadze and Porrati (DGP) demonstrated the existence of a ''self-accelerating'' branch of background solutions, but suffered from the presence of ghosts. We present a new large class of braneworld models which generalize the DGP model. Our models have negative curvature in the bulk, allow a second brane, and ha… more
Date: November 1, 2006
Creator: Carena, Marcela; Lykken, Joseph; Park, Minjoon & Santiago, Jose
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Partner: UNT Libraries Government Documents Department
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Some Interesting Min-Bias Distributions for Early LHC Runs

Description: A few observable distributions in min-bias (inelastic, non-diffractive) events which could be well constrained with early LHC data are presented, with some comments on their significance for placing constraints on theoretical models. The effects of fiducial cuts (p{perpendicular} > 0.5 GeV, |{eta}| < 2.5) and extrapolation from the Tevatron are illustrated.
Date: December 1, 2007
Creator: Skands, P. Z.
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Partner: UNT Libraries Government Documents Department
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A Note on Cosmic (p,q,r) Strings

Description: The spectrum of (p, q) bound states of F- and D-strings has a distinctive square-root tension formula that is hoped to be a hallmark of fundamental cosmic strings. We point out that the BPS bound for vortices in N = 2 supersymmetric Abelian-Higgs models also takes the square-root form. In contrast to string theory, the most general supersymmetric field theoretic model allows for (p, q, r) strings, with three classes of strings rather than two. Unfortunately, we find that there do not exist BPS … more
Date: October 1, 2006
Creator: Jackson, Mark G.
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Partner: UNT Libraries Government Documents Department
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Recent progress in Hamiltonian light-front QCD

Description: Hamiltonian light-front quantum field theory constitutes a framework for the non-perturbative solution of invariant masses and correlated parton amplitudes of self-bound systems. By choosing light-front gauge and adopting a basis function representation, we obtain a large, sparse, Hamiltonian-matrix for mass eigenstates of gauge theories that is solvable by adapting the ab initio no-core methods of nuclear many-body theory. Full covariance is recovered in the continuum limit, the infinite matri… more
Date: November 12, 2008
Creator: Vary, J; Honkanen, H.; Li, Jun; Maris, P.; Brodsky, S. J.; Sternberg, P. et al.
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Partner: UNT Libraries Government Documents Department
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On Yang--Mills Theories with Chiral Matter at Strong Coupling

Description: Strong coupling dynamics of Yang-Mills theories with chiral fermion content remained largely elusive despite much effort over the years. In this work, we propose a dynamical framework in which we can address non-perturbative properties of chiral, non-supersymmetric gauge theories, in particular, chiral quiver theories on S{sub 1} x R{sub 3}. Double-trace deformations are used to stabilize the center-symmetric vacuum. This allows one to smoothly connect smaller(S{sub 1}) to larger(S{sub 1}) phys… more
Date: August 20, 2008
Creator: Shifman, M.; /Minnesota U., Theor. Phys. Inst. /Saclay, SPhT; Unsal, Mithat & /SLAC /Stanford U., Phys. Dept.
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Partner: UNT Libraries Government Documents Department
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Highlights from Fermilab

Description: In these two lectures I will chose some highlights from the Tevatron experiments (CDF/D0) and the Neutrino experiments and then discuss the future direction of physics at Fermilab after the Tevatron collider era.
Date: December 1, 2009
Creator: Parke, Stephen J.
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Partner: UNT Libraries Government Documents Department
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Constructing Amplitudes from Their Soft Limits

Description: The existence of universal soft limits for gauge-theory and gravity amplitudes has been known for a long time. The properties of the soft limits have been exploited in numerous ways; in particular for relating an n-point amplitude to an (n-1)-point amplitude by removing a soft particle. Recently, a procedure called inverse soft was developed by which 'soft' particles can be systematically added to an amplitude to construct a higher-point amplitude for generic kinematics. We review this procedur… more
Date: December 9, 2011
Creator: Boucher-Veronneau, Camille & Larkoski, Andrew J.
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Partner: UNT Libraries Government Documents Department
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