1,557 research outputs found
Small Landau-Ginzburg theories
We classify (0,2) Landau-Ginzburg theories that can flow to compact IR fixed
points with equal left and right central charges strictly bounded by 3. Our
result is a (0,2) generalization of the ADE classification of (2,2)
Landau-Ginzburg theories that flow to N=2 minimal models. Unitarity requires
the right-moving supersymmetric sector to fall into the standard N=2 minimal
model representations, but the left-moving sector need not have supersymmetry.
The Landau-Ginzburg realizations provide a simple way to compute the chiral
algebra and other characteristics of these fixed points. While our results
pertain to isolated superconformal theories, tensor products lead to (0,2)
superconformal theories with higher central charge, and the Landau-Ginzburg
realization provides a model for a class of marginal and relevant deformations
of such theories.Comment: 22 pages; typos fixed, added discussion on chiral algebr
Modulation of gyrosynchrotron emission in solar and stellar flares by slow magnetoacoustic oscillations
Gyrosynchrotron emission generated by non-thermal electrons in solar and stellar coronal flares can be efficiently modulated by slow magnetoacoustic oscillations in the flaring loops. The modulation mechanism is based upon perturbation of the efficiency in the Razin suppression of optically thin gyrosynchrotron emission. Modulation of the emission is in anti-phase with the density perturbation in the slow wave. The observed emission modulation depth can be up to an order of magnitude higher than the slow wave amplitude. This effect is more pronounced at lower frequencies. Observations with spatial resolution, together with analysis of the modulation frequency, are shown to be sufficient for providing the information needed to identify the mode
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