2,236 research outputs found
Ion: Plato’s Defense of Poetry
This reading of Plato's Ion shows that the philosophic action mimed and engendered by the dialogue thoroughly reverses its (and Plato's) often supposed philosophical point, revealing that poetry is just as defensible as philosophy, and only in the same way. It is by Plato's indirections we find true directions out: the war between philosophy and poetry is a hoax on Plato's part, and a mistake on the part of his literalist readers. The dilemma around which the dialogue moves is false, and would have been recognized as such by Plato's contemporaries. Further, it is intrinsically related to a false, but popular, view of language. So the way out of the false dilemma of the dialogue is the way out of the war between philosophy and poetry, and also makes one see what is false about the view of language which makes such war plausible
Formation of relativistic MHD jets: stationary state solutions & numerical simulations
We discuss numerical results of relativistic magnetohydrodynamic (MHD) jet
formation models. We first review some examples of stationary state solutions
treating the collimation and acceleration process of relativistic MHD jets. We
provide an a posteriori check for the MHD condition in highly magnetized flows,
namely the comparison of particle density to Goldreich-Julian density. Using
the jet dynamical parameters calculated from the MHD model we show the
rest-frame thermal X-ray spectra of the jet, from which we derive the overall
spectrum taking into account a variation of Doppler boosting and Doppler shift
of emission lines along the outflow. Finally, we present preliminary results of
relativistic MHD simulations of jet formation demonstrating the acceleration of
a low velocity (0.01c) disk wind to a collimated high velocity (0.8c).Comment: 6 pp, 5 figs; Invited talk at High Energy Processes in Relativistic
Jets, Dublin, 2007, in pres
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