2,955 research outputs found
Enhancement of Persistent Currents by Hubbard Interactions In Disordered 1D Rings: Avoided Level Crossings Interpretation
We study effects of local electron interactions on the persistent current of
one dimensional disordered rings. For different realizations of disorder we
compute the current as a function of Aharonov-Bohm flux to zeroth and first
orders in the Hubbard interaction. We find that the persistent current is {\em
enhanced} by onsite interactions. Using an avoided level crossings approach, we
derive analytic formulas which explain the numerical results at weak disorder.
The same approach also explains the opposite effect (suppression) found for
spinless fermion models with intersite interactions.Comment: uuencoded: 17 pages, text in revtex, 7 figs in postscrip
Complex saddle points in QCD at finite temperature and density
The sign problem in QCD at finite temperature and density leads naturally to
the consideration of complex saddle points of the action or effective action.
The global symmetry of the finite-density action, where
is charge conjugation and is complex conjugation,
constrains the eigenvalues of the Polyakov loop operator at a saddle point
in such a way that the action is real at a saddle point, and net color charge
is zero. The values of and at the saddle point,
are real but not identical, indicating the different free energy cost
associated with inserting a heavy quark versus an antiquark into the system. At
such complex saddle points, the mass matrix associated with Polyakov loops may
have complex eigenvalues, reflecting oscillatory behavior in color-charge
densities. We illustrate these properties with a simple model which includes
the one-loop contribution of gluons and massless quarks moving in a constant
Polyakov loop background. Confinement-deconfinement effects are modeled
phenomenologically via an added potential term depending on the Polyakov loop
eigenvalues. For sufficiently large and , the results obtained reduce
to those of perturbation theory at the complex saddle point. These results may
be experimentally relevant for the CBM experiment at FAIR.Comment: 13 pages, 3 figures. Additional references and minor revision
Right-Handed Neutrinos and T-Violating, P-Conserving Interactions
We show that experimental probes of the P-conserving, T-violating triple
correlation in polarized neutron or nuclear -decay provide a unique
probe of possible T-violation at the TeV scale in the presence of right-handed
neutrinos. In contrast to other possible sources of semileptonic T-violation
involving only left-handed neutrinos, those involving right-handed neutrinos
are relatively unconstrained by present limits on the permanent electric dipole
moments of the electron, neutral atoms, and the neutron. On the other hand, LHC
results for missing transverse energy imply that an order of
magnitude of improvement in -coefficient sensitivity would be needed for
discovery. Finally, we discuss the interplay with the scale of neutrino mass
and naturalness considerations.Comment: 6 pages, 2 figure
Ku80 Counters Oxidative Stress-Induced DNA Damage and Cataract Formation in the Human Lens
PURPOSE: Oxidative stress in the human lens leads to a wide range of damage including DNA strand breaks, which are likely to contribute to cataract formation. The protein Ku80 is a fundamental component of the nonhomologous end-joining pathway that repairs DNA double strand breaks. This study investigates the putative impact of Ku80 in cataract prevention in the human lens. METHODS: The present study used the human lens epithelial cell line FHL124 and whole human lens organ culture. Targeted siRNA was used to deplete Ku80, with Western blot and immunocytochemistry employed to assess Ku80 expression levels. Oxidative stress was induced with hydrogen peroxide and DNA strand breaks measured by alkaline comet assay and γH2AX foci counts. Visual quality of whole human lenses was measured with image analysis software. RESULTS: Expression of Ku80 was predominately found in the cell nucleus of both FHL124 cells and native human lens epithelium. Treatment of FHL124 cells and whole lens cultures with siRNA targeted against Ku80 resulted in a significant knockdown at the protein level. Application of oxidative stress (30 μM H2O2) created more DNA strand breaks when added to Ku80 knockdown cells than in scrambled siRNA control cells as determined by the alkaline comet assay and the number of γH2AX foci. In whole lens cultures, exposure to 1 mM H2O2 resulted in more lens opacity in Ku80 knockdown lenses than match-paired controls. CONCLUSIONS: Depletion of Ku80 in the lens through acute change or a consequence of aging is likely to increase levels of DNA strand breaks, which could negatively influence physiological function and promote lens opacity. It is therefore feasible that Ku80 plays a role in retarding cataract formation
Radiomics-Based Outcome Prediction for Pancreatic Cancer Following Stereotactic Body Radiotherapy
(1) Background: Radiomics use high-throughput mining of medical imaging data to extract unique information and predict tumor behavior. Currently available clinical prediction models poorly predict treatment outcomes in pancreatic adenocarcinoma. Therefore, we used radiomic features of primary pancreatic tumors to develop outcome prediction models and compared them to traditional clinical models. (2) Methods: We extracted and analyzed radiomic data from pre-radiation contrast-enhanced CTs of 74 pancreatic cancer patients undergoing stereotactic body radiotherapy. A panel of over 800 radiomic features was screened to create overall survival and local-regional recurrence prediction models, which were compared to clinical prediction models and models combining radiomic and clinical information. (3) Results: A 6-feature radiomic signature was identified that achieved better overall survival prediction performance than the clinical model (mean concordance index: 0.66 vs. 0.54 on resampled cross-validation test sets), and the combined model improved the performance slightly further to 0.68. Similarly, a 7-feature radiomic signature better predicted recurrence than the clinical model (mean AUC of 0.78 vs. 0.66). (4) Conclusion: Overall survival and recurrence can be better predicted with models based on radiomic features than with those based on clinical features for pancreatic cancer
Mitigating the externality of diseases of poverty through health aid
Externality exists in healthcare when an individual benefits from others being healthy as it reduces the probability of getting sick from illness. Healthy workers are considered to be the more productive labourers leading to a country’s positive economic growth over time. Several research studies have modelled disease transmission and its economic impact on a single country in isolation. We developed a two-country diseaseeconomy model that explores disease transmission and crossborder infection of disease for its impacts. The model includes aspects of a worsening and rapid transmission of disease juxtaposed by positive impacts to the economy from tourism. We found that high friction affects the gross domestic product (GDP) of the lower-income country more than the higherincome country. Health aid from one country to another can substantially help grow the GDP of both countries due to the positive externality of disease reduction. Disease has less impact to both economies if the relative cost of treatment over an alternative (e.g. vaccination) is lower than the baseline value. Providing medical supplies to another country, adopting moderate friction between the countries, and finding treatments with lower costs result in the best scenario to preserve the GDP of both countries
Complex Saddle Points and Disorder Lines in QCD at finite temperature and density
The properties and consequences of complex saddle points are explored in
phenomenological models of QCD at non-zero temperature and density. Such saddle
points are a consequence of the sign problem, and should be considered in both
theoretical calculations and lattice simulations. Although saddle points in
finite-density QCD are typically in the complex plane, they are constrained by
a symmetry that simplifies analysis. We model the effective potential for
Polyakov loops using two different potential terms for confinement effects, and
consider three different cases for quarks: very heavy quarks, massless quarks
without modeling of chiral symmetry breaking effects, and light quarks with
both deconfinement and chiral symmetry restoration effects included in a pair
of PNJL models. In all cases, we find that a single dominant complex saddle
point is required for a consistent description of the model. This saddle point
is generally not far from the real axis; the most easily noticed effect is a
difference between the Polyakov loop expectation values and , and that is confined to small region in the plane. In all but one
case, a disorder line is found in the region of critical and/or crossover
behavior. The disorder line marks the boundary between exponential decay and
sinusoidally modulated exponential decay of correlation functions. Disorder
line effects are potentially observable in both simulation and experiment.
Precision simulations of QCD in the plane have the potential to clearly
discriminate between different models of confinement.Comment: 33 pages, 20 figure
U-Spin Symmetry in Doubly Cabibbo-Suppressed Charmed Meson Decays
We prove a U-spin amplitude triangle relation among doubly Cabibbo-suppressed
(DCS) charmed meson decays, and , congruent to an isospin relation among corresponding Cabibbo-favored
(CF) decays. U-spin breaking in relative phases between CF and DCS amplitudes
affects time-dependent studies of D^0-\od mixing. Comparison of final state
phase patterns in DCS and CF amplitude triangles, which can shed some light on
these phases, is carried out in a phenomenological framework incorporating
resonance contributions.Comment: Two references updated, to appear in Phys. Lett.
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