26 research outputs found
Refining the Shifted Topological Vertex
We study aspects of the refining and shifting properties of the 3d MacMahon
function used in topological string theory and BKP
hierarchy. We derive the explicit expressions of the shifted topological vertex
and its refined version
. These vertices complete results in
literature.Comment: Latex, 14 pages, 2 figures. To appear in Jour Math Phy
On Dirac Zero Modes in Hyperdiamond Model
Using the SU(5) symmetry of the 4D hyperdiamond and results on the study of
4D graphene given in "Four Dimensional Graphene" (L.B Drissi, E.H Saidi, M.
Bousmina, CPM-11-01, Phys. Rev. D (2011)), we engineer a class of 4D lattice
QCD fermions whose Dirac operators have two zero modes. We show that generally
the zero modes of the Dirac operator in hyperdiamond fermions are captured by a
tensor {\Omega}_{{\mu}}^{l} with 4\times5 complex components linking the
Euclidean SO(4) vector {\mu}; and the 5-dimensional representation of SU(5).
The Bori\c{c}i-Creutz (BC) and the Karsten-Wilzeck (KW) models as well as their
Dirac zero modes are rederived as particular realizations of
{\Omega}_{{\mu}}^{l}. Other features are also given. Keywords: Lattice QCD,
Bori\c{c}i-Creutz and Karsten-Wilzeck models, 4D hyperdiamond, 4D graphene,
SU(5) Symmetry.Comment: LaTex, 28 pages, To appear in Phys Rev
Graphene and Cousin Systems
Graphene is a new material that exhibits remarkable properties from both
fundamental and applied issues. This is a 2D matter system whose physical and
mechanical features have been approached by using tight binding model, first
principle calculations based on DFT and membrane theory. Graphene as a carbon
molecule has also hidden symmetries that motivated extensions in various
dimensions such as chain-type configurations, that are frequently observed as
the graphene bridge narrowed down to a few- or single-atom width, graphene
multi-layers thought of as electric capacitors, doped graphene to gain more
physical properties as well as cousin systems such as diamond and hyperdiamond.
In this work, we use tight binding model ideas and field theory method as well
as the hidden symmetries of the underlying crystals to study physical aspects
of 2D graphene and its homologues. We also study the relation between 2D
graphene with the Bori\c{c}i-Creutz fermions considered recently in literature
as an adequate model to perform numerical simulations in 4D lattice QCD where
the two Dirac zeros are interpreted in terms of the light quarks up and down.Comment: 34 pages, 14 figure
Bidirectional quantum teleportation of even and odd coherent states through the multipartite Glauber coherent state: Theory and implementation
Quantum teleportation has become a fundamental building block of quantum
technologies, playing a vital role in the development of quantum communication
networks. Here, we present a bidirectional quantum teleportation (BQT) protocol
that enables even and odd coherent states to be transmitted and reconstructed
over arbitrary distances in two directions. To this end, we employ the
multipartite Glauber coherent state, comprising the
Greenberger-Horne-Zeilinger, ground and Werner states, as a quantum resource
linking distant partners Alice and Bob. The pairwise entanglement existing in
symmetric and antisymmetric multipartite coherent states is explored, and by
controlling the overlap and number of probes constructing various types of
quantum channels, the teleportation efficiency of teleported states in both
directions may be maximized. Besides, Alice's and Bob's trigger phases are
estimated to explore their roles in our protocol using two kinds of quantum
statistical speed referred to as quantum Fisher information (QFI) and
Hilbert-Schmidt speed (HSS). Specifically, we show that the lower bound of the
statistical estimation error, quantified by QFI and HSS, corresponds to the
highest fidelity from Alice to Bob and conversely from Bob to Alice, and that
the choice of the pre-shared quantum channel has a critical role in achieving
high BQT efficiency. Finally, we show how to implement the suggested scheme on
current experimental tools, where Alice can transfer her even coherent state to
Bob, and at the same time, Bob can transfer his odd coherent state to Alice
Superspin Chains Solutions from 4D Chern-Simons Theory
As a generalisation of the correspondence linking 2D integrable systems with
4D Chern-Simons (CS) gauge theory, superspin chains are realized by means of
crossing electric and magnetic super line defects in the 4D CS with super gauge
symmetry. The oscillator realization of Lax operators solving the RLL relations
of integrability is obtained in the gauge theory by extending the notion of
Levi decomposition to Lie superalgebras. Based on particular 3-gradings of Lie
superalgebras, we obtain graded oscillator Lax matrices for superspin chains
with internal symmetries given by , , and
$D(m\mid n)
Magnetic Skyrmions: Theory and Applications
Magnetic skyrmions have been subject of growing interest in recent years for their very promising applications in spintronics, quantum computation and future low power information technology devices. In this book chapter, we use the field theory method and coherent spin state ideas to investigate the properties of magnetic solitons in spacetime while focussing on 2D and 3D skyrmions. We also study the case of a rigid skyrmion dissolved in a magnetic background induced by the spin-tronics; and derive the effective rigid skyrmion equation of motion. We examine as well the interaction between electrons and skyrmions; and comment on the modified Landau-Lifshitz-Gilbert equation. Other issues, including emergent electrodynamics and hot applications for next-generation high-density efficient information encoding, are also discussed
Topological String on Toric CY3s in Large Complex Structure Limit
We develop a non planar topological vertex formalism and we use it to study
the A-model partition function of topological string on the
class of toric Calabi-Yau threefolds (CY3) in large complex structure limit. To
that purpose, we first consider the special Lagrangian
fibration of generic CY3-folds and we give the realization of the class of
large toric CY3-folds in terms of supersymmetric gauged linear sigma
model with \emph{non zero} gauge invariant superpotentials . Then, we focus on a one complex parameter supersymmetric gauged
model involving six chiral superfields with and we use it to compute the function
for the case of the local elliptic curve in the limit .Comment: Latex, 38 pages, 12 figures. To appear in Nucl Phys