21,459 research outputs found
4D Tropospheric Tomography using GPS Estimated Slant Delays
Tomographic techniques are successfully applied to obtain 4D images of the
tropospheric refractivity in a local dense network. In the lower atmosphere
both the small height and time scales and the non-dispersive nature of
tropospheric delays require a more careful analysis of the data. We show how
GPS data is processed to obtain the tropospheric slant delays using the
GIPSY-OASIS II software and define the concept of pseudo-wet delays, which will
be the observables in the tomographic software. We then discuss the inverse
problem in the 3D stochastic tomography, using simulated refractivity fields to
test the system and the impact of noise. Finally, we use data from the Kilauea
network in Hawaii and a local 4x4x41-voxel grid on a region of 400 Km and
15 Km in height to produce 4D refractivity fields. Results are compared with
ECMWF forecast.Comment: 9 pages, 6 figures (2 color
A supersymmetric exotic field theory in (1+1) dimensions. One loop soliton quantum mass corrections
We consider one loop quantum corrections to soliton mass for the
supersymmetric extension of the (1+1)-dimensional scalar field theory with the
potential . First, we compute
the one loop quantum soliton mass correction of the bosonic sector. To do that,
we regularize implicitly such quantity by subtracting and adding its
corresponding tadpole graph contribution, and use the renormalization
prescription that the added term vanishes with the corresponding counterterms.
As a result we get a finite unambiguous formula for the soliton quantum mass
corrections up to one loop order. Afterwards, the computation for the
supersymmetric case is extended straightforwardly and we obtain for the one
loop quantum correction of the SUSY kink mass the expected value previously
derived for the SUSY sine-Gordon and models. However, we also have
found that for a particular value of the parameters, contrary to what was
expected, the introduction of supersymmetry in this model worsens ultraviolet
divergences rather than improving them.Comment: 16 pages, 8 figures; Major modifications included to match version
published in JHE
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