573 research outputs found
Quantization of the complex linear superfield
The quantization of the complex linear superfield requires an infinite tower
of ghosts. We use the Batalin-Vilkovisky method to obtain a gauge-fixed action.
In superspace, the method brings in some novel features.Comment: 21 pages, latex, no figure
Uniqueness of the Freedman-Townsend Interaction Vertex For Two-Form Gauge Fields
Let () be a system of free two-form gauge
fields, with field strengths and free action equal to (). It is shown that in dimensions,
the only consistent local interactions that can be added to the free action are
given by functions of the field strength components and their derivatives (and
the Chern-Simons forms in mod dimensions). These interactions do not
modify the gauge invariance of the free theory. By contrast, there exist in
dimensions consistent interactions that deform the gauge symmetry of the free
theory in a non trivial way. These consistent interactions are uniquely given
by the well-known Freedman-Townsend vertex. The method of proof uses the
cohomological techniques developed recently in the Yang-Mills context to
establish theorems on the structure of renormalized gauge-invariant operators.Comment: 12 pages Latex fil
Continuous bunch-by-bunch spectroscopic investigation of the micro-bunching instability
Electron accelerators and synchrotrons can be operated to provide short
emission pulses due to longitudinally compressed or sub-structured electron
bunches. Above a threshold current, the high charge density leads to the
micro-bunching instability and the formation of sub-structures on the bunch
shape. These time-varying sub-structures on bunches of picoseconds-long
duration lead to bursts of coherent synchrotron radiation in the terahertz
frequency range. Therefore, the spectral information in this range contains
valuable information about the bunch length, shape and sub-structures. Based on
the KAPTURE readout system, a 4-channel single-shot THz spectrometer capable of
recording 500 million spectra per second and streaming readout is presented.
First measurements of time-resolved spectra are compared to simulation results
of the Inovesa Vlasov-Fokker-Planck solver. The presented results lead to a
better understanding of the bursting dynamics especially above the
micro-bunching instability threshold.Comment: 12 pages, 11 figure
The Ursinus Weekly, January 14, 1971
Ursinus enrollment tops 2000 mark • 1971 dictionary honors Howard • Ted Taylor leaves Ursinus for Drexel • Ursinus raises tuition, stops PHEAA credit • Campus Chest pursues profit • Ursinus sponsors mock UN session • Parking problem relief envisioned • Final Forum features Fox • Editorial: the continuing struggle • Quotation of the week • Focus: Mason Williams • Unconditional courses • Boars and sows • Final examination schedule • Bears lose twice: Fall to F&M and LVC • Hockey members honored • Grapplers improve with recruitinghttps://digitalcommons.ursinus.edu/weekly/1136/thumbnail.jp
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