194,425 research outputs found
Noncommutative Gauge Theory on Fuzzy Four-Sphere and Matrix Model
We study a noncommutative gauge theory on a fuzzy four-sphere. The idea is to
use a matrix model with a fifth-rank Chern-Simons term and to expand matrices
around the fuzzy four-sphere which corresponds to a classical solution of this
model. We need extra degrees of freedom since algebra of coordinates does not
close on the fuzzy four-sphere. In such a construction, a fuzzy two sphere is
added at each point on the fuzzy four-sphere as extra degrees of freedom. It is
interesting that fields on the fuzzy four-sphere have higher spins due to the
extra degrees of freedom. We also consider a theory around the north pole and
take a flat space limit. A noncommutative gauge theory on four-dimensional
plane, which has Heisenberg type noncommutativity, is considered.Comment: 22 pages, eq.(36) and section 4 are modifie
Higher Dimensional Geometries from Matrix Brane constructions
Matrix descriptions of even dimensional fuzzy spherical branes in
Matrix Theory and other contexts in Type II superstring theory reveal, in the
large limit, higher dimensional geometries , which have an
interesting spectrum of harmonics and can be up to 20 dimensional,
while the spheres are restricted to be of dimension less than 10. In the case
, the matrix description has two dual field theory formulations. One
involves a field theory living on the non-commutative coset which
is a fuzzy fibre bundle over a fuzzy . In the other, there is a U(n)
gauge theory on a fuzzy with instantons. The two
descriptions can be related by exploiting the usual relation between the fuzzy
two-sphere and U(n) Lie algebra. We discuss the analogous phenomena in the
higher dimensional cases, developing a relation between fuzzy
cosets and unitary Lie algebras.Comment: 28 pages (Harvmac big) ; version 2 : minor typos fixed and ref. adde
On the Minkowski-H\"{o}lder type inequalities for generalized Sugeno integrals with an application
In this paper, we use a new method to obtain the necessary and sufficient
condition guaranteeing the validity of the Minkowski-H\"{o}lder type inequality
for the generalized upper Sugeno integral in the case of functions belonging to
a wider class than the comonotone functions. As a by-product, we show that the
Minkowski type inequality for seminormed fuzzy integral presented by Daraby and
Ghadimi in General Minkowski type and related inequalities for seminormed fuzzy
integrals, Sahand Communications in Mathematical Analysis 1 (2014) 9--20 is not
true. Next, we study the Minkowski-H\"{o}lder inequality for the lower Sugeno
integral and the class of -subadditive functions introduced in On
Chebyshev type inequalities for generalized Sugeno integrals, Fuzzy Sets and
Systems 244 (2014) 51--62. The results are applied to derive new metrics on the
space of measurable functions in the setting of nonadditive measure theory. We
also give a partial answer to the open problem 2.22 posed by
Borzov\'a-Moln\'arov\'a and et al in The smallest semicopula-based universal
integrals I: Properties and characterizations, Fuzzy Sets and Systems 271
(2015) 1--17.Comment: 19 page
Fuzzy BIon
We construct a solution of the BFSS matrix theory, which is a counterpart of
the BIon solution representing a fundamental string ending on a bound state of
a D2-brane and D0-branes. We call this solution the `fuzzy BIon' and show that
this configuration preserves 1/4 supersymmetry of type IIA superstring theory.
We also construct an effective action for the fuzzy BIon by analyzing the
nonabelian Born-Infeld action for D0-branes. When we take the continuous limit,
with some conditions, this action coincides with the effective action for the
BIon configuration.Comment: 11 pages, 1 figure, reference and note adde
Nonlinear modelling and optimal control via Takagi-Sugeno fuzzy techniques: A quadrotor stabilization
Using the principles of Takagi-Sugeno fuzzy modelling allows the integration of flexible fuzzy approaches and rigorous mathematical tools of linear system theory into one common framework. The rule-based T-S fuzzy model splits a nonlinear system into several linear subsystems. Parallel Distributed Compensation (PDC) controller synthesis uses these T-S fuzzy model rules. The resulting fuzzy controller is nonlinear, based on fuzzy aggregation of state controllers of individual linear subsystems. The system is optimized by the linear quadratic control (LQC) method, its stability is analysed using the Lyapunov method. Stability conditions are guaranteed by a system of linear matrix inequalities (LMIs) formulated and solved for the closed loop system with the proposed PDC controller. The additional GA optimization procedure is introduced, and a new type of its fitness function is proposed to improve the closed-loop system performance.Web of Science71110
Large N reduction for Chern-Simons theory on S^3
We study a matrix model which is obtained by dimensional reduction of
Chern-Simon theory on S^3 to zero dimension. We find that expanded around a
particular background consisting of multiple fuzzy spheres, it reproduces the
original theory on S^3 in the planar limit. This is viewed as a new type of the
large N reduction generalized to curved space.Comment: 4 pages, 2 figures, references added, typos correcte
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