dorsal/arxiv
View SchemaExperimental demonstration of a new radiation mechanism: emission by an oscillating, accelerated, superluminal polarization current
| Authors | A. Ardavan, J. Singleton, H. Ardavan, J. Fopma, D. Halliday, W. Hayes |
|---|---|
| Categories | |
| ArXiv ID | physics/0405062 |
| URL | https://arxiv.org/abs/physics/0405062 |
Abstract
We describe the experimental implementation of a superluminal ({\it i.e.} faster than light {\it in vacuo}) polarization current distribution that both oscillates and undergoes centripetal acceleration. Theoretical treatments lead one to expect that the radiation emitted from each volume element of such a polarization current will comprise a \v{C}erenkov-like envelope with two sheets that meet along a cusp. The emission from the experimental machine is in good agreement with these expectations, the combined effect of the volume elements leading to tightly-defined beams of a well-defined geometry, determined by the source speed and trajectory. In addition, over a restricted range of angles, we detect the presence of cusps in the emitted radiation. These are due to the detection over a short time period (in the laboratory frame) of radiation emitted over a considerably longer period of source time. Consequently, the intensity of the radiation at these angles was observed to decline more slowly with increasing distance from the source than would the emission from a conventional antenna. The angular distribution of the emitted radiation and the properties associated with the cusps are in good {\it quantitative} agreement with theoretical models of superluminal sources once the effect of reflections from the earth's surface are taken into account.
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"abstract": "We describe the experimental implementation of a superluminal ({\\it i.e.}\nfaster than light {\\it in vacuo}) polarization current distribution that both\noscillates and undergoes centripetal acceleration. Theoretical treatments lead\none to expect that the radiation emitted from each volume element of such a\npolarization current will comprise a \\v{C}erenkov-like envelope with two sheets\nthat meet along a cusp. The emission from the experimental machine is in good\nagreement with these expectations, the combined effect of the volume elements\nleading to tightly-defined beams of a well-defined geometry, determined by the\nsource speed and trajectory. In addition, over a restricted range of angles, we\ndetect the presence of cusps in the emitted radiation. These are due to the\ndetection over a short time period (in the laboratory frame) of radiation\nemitted over a considerably longer period of source time. Consequently, the\nintensity of the radiation at these angles was observed to decline more slowly\nwith increasing distance from the source than would the emission from a\nconventional antenna. The angular distribution of the emitted radiation and the\nproperties associated with the cusps are in good {\\it quantitative} agreement\nwith theoretical models of superluminal sources once the effect of reflections\nfrom the earth\u0027s surface are taken into account.",
"arxiv_id": "physics/0405062",
"authors": [
"A. Ardavan",
"J. Singleton",
"H. Ardavan",
"J. Fopma",
"D. Halliday",
"W. Hayes"
],
"categories": [
"physics.optics",
"physics.space-ph"
],
"title": "Experimental demonstration of a new radiation mechanism: emission by an oscillating, accelerated, superluminal polarization current",
"url": "https://arxiv.org/abs/physics/0405062"
},
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