6 research outputs found
Braneworld with Induced Axial Symmetry
We take arbitrary gravitational perturbations of a 5d spacetime and reduce it
to the form an axially symmetric warped braneworld. Then, we write the filed
equations for the linearized gravity perturbations. We obtain the equations
that describes the graviton, gravivector and the graviscalar fluctuations and
analyse the effects of the Schr\"odinger potentials that appear in these
equations.Comment: 3 pages, one figure, typos corrected, to apear in the special issue
of Brazilian Journal of Physics dedicated to the conference 100 years of
relativity, Sao Paulo, Brazil, 200
The Schenberg spherical gravitational wave detector: the first commissioning runs
Here we present a status report of the first spherical antenna project equipped with a set of parametric transducers for gravitational detection. The Mario Schenberg, as it is called, started its commissioning phase at the Physics Institute of the University of Sao Paulo, in September 2006, under the full support of FAPESP. We have been testing the three preliminary parametric transducer systems in order to prepare the detector for the next cryogenic run, when it will be calibrated. We are also developing sapphire oscillators that will replace the current ones thereby providing better performance. We also plan to install eight transducers in the near future, six of which are of the two-mode type and arranged according to the truncated icosahedron configuration. The other two, which will be placed close to the sphere equator, will be mechanically non-resonant. In doing so, we want to verify that if the Schenberg antenna can become a wideband gravitational wave detector through the use of an ultra-high sensitivity non-resonant transducer constructed using the recent achievements of nanotechnology