2,706 research outputs found
Reflection-less device allows electromagnetic warp drive
One of the striking properties of artificially structured materials is the
negative refraction, an optical feature that known natural materials do not
exhibit. Here, we propose a simple design, composed of two parallel layers of
materials with different refraction indices , that constructs perfect
reflection-less devices. The electromagnetic waves can tunnel from one layer to
the other, a feature that resembles a truncation of the physical space leading
to an electromagnetic warp drive. Since the refractive indices do not require
any large values, this method demonstrates for the first time the practical
feasibility of guiding electromagnetic fields in complete absence of reflection
phenomena and without degradation of transmission efficiency at all.Comment: 8 pages, 7 figure
Investigation of Environmental Change Pattern in Japan: Multidisciplinary Application of LANDSAT-2 Data to Marine Environment in Central Japan
The author has identified the following significant results. The multidisciplinary application of multispectral scanner data acquired over central Japan revealed several coastal features including pollution, river effluent, shorelines, red tide, etc. Supporting data were obtained by airborne remote sensing
Significant applications of LANDSAT-2 MSS data to marine environment
There are no author-identified significant results in this report
Quantum Creation of the Randall-Sundrum Bubble
We investigate the semiclassical instability of the Randall-Sundrum brane
world. We carefully analyze the bubble solution with the Randall-Sundrum
background, which expresses the decay of the brane world. We evaluate the decay
probability following the Euclidean path integral approach to quantum gravity.
Since a bubble rapidly expands after the nucleation, the entire spacetime will
be occupied by such bubbles.Comment: 13 pages, 6 figures, To appear in Prog. Theor. Phy
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