10,374 research outputs found
Gravitomagnetic Fields in Rotating Superconductors to Solve Tate's Cooper Pair Mass Anomaly
Superconductors have often been used to claim gravitational anomalies in the
context of breakthrough propulsion. The experiments could not be reproduced by
others up to now, and the theories were either shown to be wrong or are often
based on difficult to prove assumptions. We will show that superconductors
indeed could be used to produce non-classical gravitational fields, based on
the established disagreement between theoretical prediction and measured
Cooper-pair mass in Niobium. Tate et al failed to measure the Cooper-pair mass
in Niobium as predicted by quantum theory. This has been discussed in the
literature without any apparent solution. Based on the work from DeWitt to
include gravitomagnetism in the canonical momentum of Cooper-pairs, the authors
published a number of papers discussing a possibly involved gravitomagnetic
field in rotating superconductors to solve Tate's measured anomaly. Although
one possibility to match Tate's measurement, a number of reasons were developed
by the authors over the last years to show that the gravitomagnetic field in a
rotating quantum material must be different from its classical value and that
Tate's result is actually the first experimental sign for it. This paper
reviews the latest theoretical approaches to solve the Tate Cooper-pair anomaly
based on gravitomagnetic fields in rotating superconductors
Generation of Closed Timelike Curves with Rotating Superconductors
The spacetime metric around a rotating SuperConductive Ring (SCR) is deduced
from the gravitomagnetic London moment in rotating superconductors. It is shown
that theoretically it is possible to generate Closed Timelike Curves (CTC) with
rotating SCRs. The possibility to use these CTC's to travel in time as
initially idealized by G\"{o}del is investigated. It is shown however, that
from a technology and experimental point of view these ideas are impossible to
implement in the present context.Comment: 9 pages. Submitted to Classical and Quantum Gravit
Generalized Gross--Perry--Sorkin--Like Solitons
In this paper, we present a new solution for the effective theory of
Maxwell--Einstein--Dilaton, Low energy string and Kaluza--Klein theories, which
contains among other solutions the well known Kaluza--Klein monopole solution
of Gross--Perry--Sorkin as special case. We show also the magnetic and electric
dipole solutions contained in the general one.Comment: 10 latex pages, no figures. To appear in Class. Quant. Gravity
Characterization of digital dispersive spectrometers by low coherence interferometry
We propose a procedure to determine the spectral response of digital dispersive spectrometers without previous knowledge of any parameter of the system. The method consists of applying the Fourier transform spectroscopy technique to each pixel of the detection plane, a CCD camera, to obtain its individual spectral response. From this simple procedure, the system-point spread function and the effect of the finite pixel width are taken into account giving rise to a response matrix that fully characterizes the spectrometer. Using the response matrix information we find the resolving power of a given spectrometer, predict in advance its response to any virtual input spectrum and improve numerically the spectrometer's resolution. We consider that the presented approach could be useful in most spectroscopic branches such as in computational spectroscopy, optical coherence tomography, hyperspectral imaging, spectral interferometry and analytical chemistry, among others.Fil: Martínez Matos, Ó.. Universidad Complutense de Madrid; EspañaFil: Rickenstorff, C.. Universidad Complutense de Madrid; EspañaFil: Zamora, S.. Universidad Complutense de Madrid; EspañaFil: Izquierdo, J. G.. Universidad Complutense de Madrid; EspañaFil: Vaveliuk, Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Ópticas. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Investigaciones Ópticas. Universidad Nacional de La Plata. Centro de Investigaciones Ópticas; Argentin
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