1,797,444 research outputs found
A model of color confinement
A simple model is presented that describes the free energy of QCD
coupled to an external current that is a single plane wave, . The model satisfies a bound obtained previously on that comes
from the Gribov horizon. If one uses this model to fit recent lattice data ---
which give for the gluon propagator a non-zero value, , at
--- the data favor a non-analyticity in .Comment: 3 pages, talk given at Quark Confinement and Hadron Spectrum IX,
Madrid, Spain, Aug. 30 to Sept. 3, 201
An improved model of color confinement
We consider the free energy of QCD coupled to an external
source , where is, by analogy
with spin models, an external "magnetic" field with a color index that is
modulated by a plane wave. We report an optimal bound on and an exact
asymptotic expression for at large . They imply confinement of
color in the sense that the free energy per unit volume and the
average magnetization m(k, H) ={1 \over V} {\p W_k(H) \over \p H} vanish in
the limit of constant external field . Recent lattice data indicate a
gluon propagator which is non-zero, , at . This
would imply a non-analyticity in at . We present a model that
is consistent with the new results and exhibits (non)-analytic behavior. Direct
numerical tests of the bounds are proposed.Comment: 7 pages, 0 figures, invited talk The many faces of QCD, November 2-5,
2010, Gent Belgiu
On a Possible Size/Color Relationship in the Kuiper Belt
Color measurements and albedo distributions introduce non-intuitive
observational biases in size-color relationships among Kuiper Belt Objects
(KBOs) that cannot be disentangled without a well characterized sample
population with systematic photometry. Peixinho et al. report that the form of
the KBO color distribution varies with absolute magnitude, H. However, Tegler
et al. find that KBO color distributions are a property of object
classification. We construct synthetic models of observed KBO colors based on
two B-R color distribution scenarios: color distribution dependent on H
magnitude (H-Model) and color distribution based on object classification
(Class-Model). These synthetic B-R color distributions were modified to account
for observational flux biases. We compare our synthetic B-R distributions to
the observed 'Hot' and 'Cold' detected objects from the Canada-France Ecliptic
Plane Survey and the Meudon Multicolor Survey. For both surveys, the Hot
population color distribution rejects the H-Model, but is well described by the
Class-Model. The Cold objects reject the H-Model, but the Class-Model (while
not statistically rejected) also does not provide a compelling match for data.
Although we formally reject models where the structure of the color
distribution is a strong function of H magnitude, we also do not find that a
simple dependence of color distribution on orbit classification is sufficient
to describe the color distribution of classical KBOs
A Dynamical Model of Color Confinement
A dynamical model of confinement based on a transport theoretical description
of the Friedberg-Lee model is extended to explicit color degrees of freedom.
The string tension is reproduced by an adiabatic string formation from the
nucleon ground state. Color isovector oscillation modes of a -system
are investigated for a wide range of relative -momenta and the
dynamical impact of color confinement on the quark motion is shown.Comment: 12 pages plus 5 figure
Parton Branching in Color Mutation Model
The soft production problem in hadronic collisions as described in the
eikonal color mutation branching model is improved in the way that the initial
parton distribution is treated. Furry branching of the partons is considered as
a means of describing the nonperturbative process of parton reproduction in
soft interaction. The values of all the moments, and , for q=2,...,5,
as well as their energy dependences can be correctly determined by the use of
only two parameters.Comment: 8 pages (LaTeX) + 2 figures (ps files), submitted to Phys. Rev.
Color Development in Complex Model System on Various TIME and Temperature
The research was intended to study the development of color during heat treatment in a model real system consisted of sucrose, sweetened condensed milk, egg and margarine. Research applied was factorialcompletely randomized design with steaming time consist of 1,2,3 and 4 hours and temperatures consist of 100oC, and 110oC as treatment with 3 replication. The changes of color was investigated by using Munsell color system consist of value/lightness, hue angle, and chroma. Browning index was measured by using the absorbance of ethanol extracts at 420 nm in 40.0 mm silica. Amino acid content was observed by using HPLC. Research showed that there were negative correlation between steaming time and temperature with lightness, hue angle, chroma, and amino acid. While for TCD, and browning index indicated positive correlation
Character Sequence Models for ColorfulWords
We present a neural network architecture to predict a point in color space
from the sequence of characters in the color's name. Using large scale
color--name pairs obtained from an online color design forum, we evaluate our
model on a "color Turing test" and find that, given a name, the colors
predicted by our model are preferred by annotators to color names created by
humans. Our datasets and demo system are available online at colorlab.us
Color dielectric model with two scalar fields
SU(2) Yang-Mills theory coupled in a non-minimal way to two scalar fields is
discussed. For the massless scalar fields a family of finite energy solutions
generated by an external, static electric charge is found. Additionally, there
is a single solution which can be interpreted as confining one. Similar
solutions have been obtained in the magnetic sector. In case of massive scalar
fields the Coulomb problem is investigated. We find that asymptotic behavior of
the fields can also, for some values of the parameter of the model, give
confinement of the electric charge. Quite interesting one glueball--meson
coupling gives the linear confining potential. Finally, it is shown that for
one non-dynamical scalar field we derive the color dielectric generalization of
the Pagels--Tomboulis model.Comment: 20 pages, LaTeX, Accepted for publication in Eur. Phys. J.
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