37 research outputs found
A numerical study of confinement in compact QED
Compact U(1) lattice gauge theory in four dimensions is studied by means of
an efficient algorithm which exploits the duality transformation properties of
the model. We focus our attention onto the confining regime, considering the
interquark potential and force, and the electric field induced by two
infinitely heavy sources. We consider both the zero and finite temperature
setting, and compare the theoretical predictions derived from the effective
string model and the dual superconductor scenario to the numerical results.Comment: 31 pages, 16 eps figures; v2: references added; v3: footnote added,
summation ranges in section 4 made explicit, version published in JHE
Supersymmetric null-surfaces
Single trace operators with the large R-charge in supersymmetric Yang-Mills
theory correspond to the null-surfaces in . We argue that the
moduli space of the null-surfaces is the space of contours in the
super-Grassmanian parametrizing the complex -dimensional subspaces of
the complex -dimensional space. The odd coordinates on this
super-Grassmanian correspond to the fermionic degrees of freedom of the
superstring.Comment: v4: added a reference to the earlier work; corrected the formula for
the stabilizer of the BMN vacuum; added the discussion of the complex
structure of the odd coordinates in Section 3.
Coherent States of groups
This work can be considered as a continuation of our previous one (J.Phys.,
26 (1993) 313), in which an explicit form of coherent states (CS) for all SU(N)
groups was constructed by means of representations on polynomials. Here we
extend that approach to any SU(l,1) group and construct explicitly
corresponding CS. The CS are parametrized by dots of a coset space, which is,
in that particular case, the open complex ball . This space together
with the projective space , which parametrizes CS of the SU(l+1) group,
exhausts all complex spaces of constant curvature. Thus, both sets of CS
provide a possibility for an explicit analysis of the quantization problem on
all the spaces of constant curvature.Comment: 22 pages, to be published in "Journal of Physics A
Матеріали XIV Всеукраїнської науково-практичної конференції студентів, аспiрантiв та молодих вчених «Теоретичні i прикладні проблеми фізики, математики та інформатики»
Reactive joining of various materials by using different types of reactive multilayer foils is considered. An electron beam deposition method is presented for producing reactive composite foils. These foils may provide efficient joining of
traditional PCBs.joining, welding, bonding, exothermic reaction, reactive multilayer foil, electron-beam deposition, microstructur
On the Nature of the Variation of Martensitic Transformation Hysteresis and SME Characteristics in Fe-Ni-Base Alloys
Calculation of equivalent parameters for aperture frequency selective surfaces. (in Russian)
Study of the martensitic transformation in the Hafnium-Palladium system
High temperature shape memory alloys have received a large interest for many years
but none of the systems studied so far has led to industrial applications. Those alloys are
expected to develop an actuating role in high temperature environment as for example aircraft
turbines. Lots of criteria are required in order to substitute or optimize heavy existing
actuators. Here are presented a few results obtained with the system hafnium-palladium,
not so documented for the moment, that develops a martensitic transformation at around 773 K.
According to the characteristics of very well-known alloys such as NiTi, some compositions
around the equiatomic are explored. The main ob jective of our work is to know the influence
of a stoechiometry gap on the microstructure of the alloys and the martensitic transformation