782 research outputs found
Deconfinement and Thermodynamics in 5D Holographic Models of QCD
We review 5D holographic approaches to finite temperature QCD. Thermodynamic
properties of the "hard-wall" and the "soft-wall" models are derived. Various
non-realistic features in these models are cured by the set-up of improved
holographic QCD, that we review here.Comment: Invited review paper for Mod. Phys. Let
Effects of Pre-School Teacher's Self-Esteem on Teacher Attitudes
AbstractIn this study the effects of pre-school teacher's self-esteem on teacher attitudes was analyzed. The data collection tools used in the study were the Teacher Attitude Scale for Pre-School Teachers developed by Bilgin (1995) and the Self-Esteem Scale developed by Arıcak (1999). The tools were completed by 307 pre-school teachers in the second half of 2007-2008 academic year. It was studied whether a meaningful difference was caused in the subdimensions of the two tools by the variables of age, attending graduate school, being satisfied with income, marital status, intentional choice of the teaching profession, being content with the profession, and having in-service training. In order to test this arithmetic means, one-way ANOVA, independent groups t-test and Pearson Moments Correlation were used. All statistical analyzes in the study were made by using the SPSS package program. The level of significance was set at minimum .05. The results showed a weak positive relationship between pre-school teacher's self-esteem and teacher attitudes
On the YM and QCD spectra from five dimensional strings
We consider a non-critical five dimensional string setup which could provide
a dual description of QCD in the limit of large number of colors and flavors.
The model corresponds to N_c color D3-branes and N_f D4/anti D4-brane pairs
supporting flavor degrees of freedom. The matching of the string model spectrum
with the dual field theory one is considered. We discuss the consequences of
the possible matching of the gravity modes with the light glueballs and the
interpretation of the brane spectrum in Yang-Mills and QCD.Comment: 21 pages; V2: added corrections and references to match the published
versio
Holography and Thermodynamics of 5D Dilaton-gravity
The asymptotically-logarithmically-AdS black-hole solutions of 5D dilaton
gravity with a monotonic dilaton potential are analyzed in detail. Such
theories are holographically very close to pure Yang-Mills theory in four
dimensions. The existence and uniqueness of black-hole solutions is shown. It
is also shown that a Hawking-Page transition exists at finite temperature if
and only if the potential corresponds to a confining theory. The physics of the
transition matches in detail with that of deconfinement of the Yang-Mills
theory. The high-temperature phase asymptotes to a free gluon gas at high
temperature matching the expected behavior from asymptotic freedom. The thermal
gluon condensate is calculated and shown to be crucial for the existence of a
non-trivial deconfining transition. The condensate of the topological charge is
shown to vanish in the deconfined phase.Comment: LaTeX, 61 pages (main body) + 58 pages (appendix), 25 eps figures.
Revised version, published in JHEP. Two equations added in Section 7.4; typos
corrected; references adde
The Penrose limit of AdS*S space and holography
In the Penrose limit, AdS*S space turns into a Cahen-Wallach (CW) space whose
Killing vectors satisfy a Heisenberg algebra. This algebra is mapped onto the
holographic screen on the boundary of AdS. I show that the Heisenberg algebra
on the boundary of AdS may be obtained directly from the CW space by
appropriately constraining the states defined on it. The transformations
generated by the constraint are similar to gauge transformations. The
``holographic screen'' on the CW space is thus obtained as a ``gauge-fixing''
condition.Comment: 12 pages, improved discussion, to appear in Mod. Phys. Lett.
Getting Gideon Right
In Gideon v. Wainwright, the U.S. Supreme Court held that the government must provide a criminal defense lawyer for any accused person who cannot afford one. But for too many people, Gideon\u27s promise remains unfulfilled. In Texas, there are no statewide guidelines about who is entitled to a court-appointed lawyer. Instead, counties create their own rules that create serious gaps in constitutional protection. Getting Gideon Right investigates the financial standards that determine an accused person\u27s eligibility for appointed counsel in Texas county courts. The report reveals a patchwork of county court policies that are both complex and severe.https://scholar.smu.edu/deasoncenter/1007/thumbnail.jp
Decay Modes of Unstable Strings in Plane-Wave String Field Theory
The cubic interaction vertex of light-cone string field theory in the
plane-wave background has a simple effective form when considering states with
only bosonic excitations. This simple effective interaction vertex is used in
this paper to calculate the three string interaction matrix elements for states
of arbitrary bosonic excitation and these results are used to examine certain
decay modes on the mass-shell. It is shown that the matrix elements of one
string to two string decays involving only bosonic excitations will vanish to
all orders in 1/mu on the mass-shell when the number of excitations on the
initial string is less than or equal to two, but in general will not vanish
when the number of excitations is greater than two. Also, a truncated
calculation of the mass-shell matrix elements for one string to three string
decays of two excitation states is performed and suggests that these matrix
elements do not vanish on the mass-shell. There is, however, a quantitative
discrepancy between this last result and its (also non-vanishing) gauge theory
prediction from the BMN correspondence.Comment: 11 pages; v2: references added; v3: normalization of interaction
vertex and corresponding amplitudes changed by a factor of mu to reflect SFT
normalization (must now divide by mu to compare with BMN dual gauge theory),
and minor errors correcte
Application of data mining techniques to protein-protein interaction prediction
Protein-protein interactions are key to understanding biological processes and disease mechanisms in organisms. There is a vast amount of data on proteins waiting to be explored. In this paper, we describe application of data mining techniques, namely association rule mining and ID3 classification, to the problem of predicting protein-protein interactions. We have combined available interaction data and protein domain decomposition data to infer new interactions. Preliminary results show that our approach helps us find plausible rules to understand biological processes. © Springer-Verlag Berlin Heidelberg 2003
Improved Holographic QCD
We provide a review to holographic models based on Einstein-dilaton gravity
with a potential in 5 dimensions. Such theories, for a judicious choice of
potential are very close to the physics of large-N YM theory both at zero and
finite temperature. The zero temperature glueball spectra as well as their
finite temperature thermodynamic functions compare well with lattice data. The
model can be used to calculate transport coefficients, like bulk viscosity, the
drag force and jet quenching parameters, relevant for the physics of the
Quark-Gluon Plasma.Comment: LatEX, 65 pages, 28 figures, 9 Tables. Based on lectures given at
several Schools. To appear in the proceedinds of the 5th Aegean School
(Milos, Greece
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