887 research outputs found
Selection of factorizable ground state in a frustrated spin tube: Order by disorder and hidden ferromagnetism
The interplay between frustration and quantum fluctuation in magnetic systems
is known to be the origin of many exotic states in condensed matter physics. In
this paper, we consider a frustrated four-leg spin tube under a magnetic field.
This system is a prototype to study the emergence of a nonmagnetic ground state
factorizable into local states and the associated order parameter without
quantum fluctuation, that appears in a wide variety of frustrated systems. The
one-dimensional nature of the system allows us to apply various techniques: a
path-integral formulation based on the notion of order by disorder,
strong-coupling analysis where magnetic excitations are gapped, and
density-matrix renormalization group. All methods point toward an interesting
property of the ground state in the magnetization plateaus, namely, a quantized
value of relative magnetizations between different sublattices (spin imbalance)
and an almost perfect factorization of the ground state
A solution to the hierarchy problem from an almost decoupled hidden sector within a classically scale invariant theory
If scale invariance is a classical symmetry then both the Planck scale and
the weak scale should emerge as quantum effects. We show that this can be
realized in simple scale invariant theories with a hidden sector. The
weak/Planck scale hierarchy emerges in the (technically natural) limit where
the hidden sector decouples from the ordinary sector. The weak scale is
protected from quadratic divergences because of classical scale invariance, so
there is no hierarchy problem.Comment: 10 page
A Research of Basic Energy Reduction Approach Using PV Power Smoothing EV Storage System and LED Simple Circuit for Create Green Innovation
In general, Light Emitting Diode (LED) is low power consumption, and Photovoltaic (PV) generation of Renewable Energy is effective as energy creation. However, LED applications have a problem of LED Circuit Radiation Noise and PV generation applications have a problem of the Output Power fluctuation in the weather. This paper will be proposed as an especial approach of the energy reduction to contribute to the realization of the low carbon society in the world. In this research, without using Common Mode Choke (CMC) Noise Cut filter, the Radiation Noise reduction result in World Standard Guideline by the selection of a simple circuit of the most effective LED lighting of various power reduction methods have been confirmed by the examinations. Additionally, in order to investigate the lighting specification, the simple Lighting evaluation equipment has been developed. As an energy fluctuation reduction research, the new control system of the PV fluctuation electric power using EV battery charge-discharge electric power that is able to be easily connected with a Power Conditioning System (PCS) input is proposed. A simulation result using the actual PV generator output data is provided to confirm the effectiveness of Simple Moving Average (SMA) method. Moreover, the outline of a new large area monitoring control GIS system for the implementation of the PV generator power prognostication without the weather estimation is introduced.äč淄性ă»ăăŹăŒă·ăąăăă©ć€§ćŠćœéććă·ăłăăžăŠă : International Symposium on Applied Engineering and Sciences (SAES), September 30- October 1, 2013, Universiti Putra Malaysia, Malaysi
Open String Amplitudes in Various Gauges
Recently, Schnabl constructed the analytic solution of the open string
tachyon. Subsequently, the absence of the physical states at the vacuum was
proved. The development relies heavily on the use of the gauge condition
different from the ordinary one. It was shown that the choice of gauge
simplifies the analysis drastically. When we perform the calculation of the
amplitudes in Schnabl gauge, we find that the off-shell amplitudes of the
Schnabl gauge is still very complicated. In this paper, we propose the use of
the propagator in the modified Schnabl gauge and show that this modified use of
the Schnabl gauge simplifies the computation of the off-shell amplitudes
drastically. We also compute the amplitudes of open superstring in this gauge.Comment: 23 pages, minor correction
More on N=1 Matrix Model Curve for Arbitrary N
Using both the matrix model prescription and the strong-coupling approach, we
describe the intersections of n=0 and n=1 non-degenerated branches for quartic
(polynomial of adjoint matter) tree-level superpotential in N=1 supersymmetric
SO(N)/USp(2N) gauge theories with massless flavors. We also apply the method to
the degenerated branch. The general matrix model curve on the two cases we
obtain is valid for arbitrary N and extends the previous work from
strong-coupling approach. For SO(N) gauge theory with equal massive flavors, we
also obtain the matrix model curve on the degenerated branch for arbitrary N.
Finally we discuss on the intersections of n=0 and n=1 non-degenerated branches
for equal massive flavors.Comment: 36pp; to appear in JHE
The sixth Painleve equation arising from D_4^{(1)} hierarchy
The sixth Painleve equation arises from a Drinfel'd-Sokolov hierarchy
associated with the affine Lie algebra of type D_4 by similarity reduction.Comment: 14 page
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