156,566 research outputs found
Confining strings in the Abelian-projected SU(3)-gluodynamics II. 4D-case with -term
The generalization of 4D confining string theory to the SU(3)-inspired case
is derived. It describes string representation of the Wilson loop in the
SU(3)-analogue of compact QED extended by the -term. It is shown that
although the obtained theory of confining strings differs from that of compact
QED, their low-energy limits have the same functional form. This fact leads to
the appearance of the string -term in the low-energy limit of the
SU(3)-inspired confining string theory. In particular, it is shown that in the
extreme strong coupling regime, the crumpling of string world sheets could
disappear owing to the string -term at . Finally, some
characteristic features of the SU(N)-case are pointed out.Comment: 8 pages, LaTeX2e, no figures, to appear in Europhys. Letter
The molecular self-association of carboxylic acids in solution: testing the validity of the link hypothesis using a quantum mechanical continuum solvation approach
On the contact conditions for the charge profile in the theory of the electrical double layer for nonsymmetrical electrolytes
The contact value of the charge profile for nonsymmetrical electrolytes is
presented as the sum of three contributions. One of them is the normal
component of the Maxwell electrostatic stress tensor. The second one is the
surface electrostatic property defined as the integral of the product of the
gradient of the electrical potential and the density distribution function of
coions. The third term is the bulk contribution defined by the sum for anions
and for cations of the product of their charge and their partial pressure. For
noncharged surfaces only the last two are present and have the same sign in the
case of size asymmetry. In the case of charge asymmetry the contact value of
the charge profile is the result of the competitions of bulk and surface terms
in which the bulk term is dominant. Using both the contact theorems for the
density and the charge profiles, the exact expressions for the contact values
of the profiles of coions and counterions are obtained and some related
properties are discussed.Comment: 5 page
Condensation of vortices and disorder parameter in 3d Heisenberg model
The 3d Heisenberg model is studied from a dual point of view. It is shown
that the disordered phase corresponds to condensation of vortices in the
vacuum, and the critical indices are computed from the corresponding disorder
parameter.Comment: LATTICE98(spin
Spontaneous polarisation of the neutral interface for valence asymmetric coulombic systems
In this paper, we discuss the phenomenon of a spontaneous polarisation of a
neutral hard planar interface for valence asymmetric coulombic systems. Within
a field theoretical description, we account for the existence of non trivial
charge density and electric potential profiles. The analysis of the phenomenon
shows that the effect is related to combinatorics in relation with the
existence of the two independent species cations and anions. This simple and
basic feature is related to the quantum mechanical properties of the system.
The theoretical results are compared with numerical simulations data and are
shown to be in very good agreement, which a fortiori justifies our physical
interpretation.Comment: 12 pages, 11 figure
Social networks and trust: not the experimental evidence you may expect
We run a laboratory experiment where 'friendship' networks are generated endogenously within an anonymous group. Our experiment builds on two phases in sequence: a network formation game and a trust game. We find that in those sessions where the trust game is played before the network formation game, the overall level of trust is not significantly different from the one observed in a simple trust game; in those sessions where the trust game is played after the network formation game we find that the overall level of trust is significantly lower than in the simple trust game. Hence surprisingly trust does not increase because of 'enforced reciprocity' and moreover a common social history does affect the level of trust, but in a negative manner. Where network effects matter is in the choice of whom to trust: while we tend to trust less on average those with whom we have already interacted compared to total strangers, past history allows us to select whom to trust relatively more than others
String breaking in QCD: dual superconductor vs. stochastic vacuum model
Effects of dispersion of the chromoelectric field of the flux tube on the
string-breaking distance are studied. The leading-order correction is shown to
slightly diminish the result following from the Schwinger formula. Instead,
accounting for corrections of all orders might result, at certain values of the
Landau-Ginzburg parameter, in an increase of the string-breaking distance up to
one order of magnitude. An alternative formula for this distance is obtained
when produced pairs are treated as holes in a confining pellicle, which spans
over the contour of an external quark-antiquark pair. Generalizations of the
obtained results to the cases of small temperatures, as well as temperatures
close to the critical one are also discussed.Comment: 21 pages, no figures, uses JHEP3.cl
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