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By H. Piaggio

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TUU = 0) can be decomposed into 0, 1, 2 spin parts as (101) By using (81)-(86) it can easily be seen that for a point charge with Jeµ = e v one of the wave equations (96)-(99) yield terms like µ G(x-[  any and form the basis for the derivation of the usual gauge invariant Dirac wave equation describing the interaction of a photon with a point electric charge. For distances large compared to Plank length (or ro ) and to order of q-2, the field equations (68) and their supersymmetric counterparts, with the assumption gµv = ηµv, reduce to (102) (103) where κ 2 = 2 ro-2 and where we used the relations (86) with Jeµ = 0, sµ = 0 to obtain four 20 (2) (2) restrictions (√ (-g) Tµv) | v = 0 to construct the spin 2 tensors T µv (F), T µv (B) each with five independent components only.

In the limit of negligible scattering, we see that equation (3) and (4) define, for a given mass, the minimum detectable strain for a given frequency. The Current Status of LIGO Detectors As of this writing, all of the infrastructure (in the form of laboratory buildings, beam tubes, light baffles, optics chambers, and vacuum systems) is in place at both sites. Construction on the optical beamline of the first interferometer (the 2 km arm length interferometer at Hanford) has begun with the installation of the 10 W, 1064 nm frequency Nd:YAG Pre-stabilized Laser and the LIGO Input Optics.

In order to increase the total interaction time, LIGO will employ resonant Fabry-Perot cavities in the arms of the interferometer. The Fabry-Perot arm cavities enhance the storage time of the light in the interferometer (or alternatively, the effective length of the interferometer) by a factor (rIr2)/[2(1-rIr2)], where r1,2 are the amplitude reflectivities of the input test mass and end test mass, respectively. The storage time is further enhanced by the power recycling mirror. For LIGO, the overall storage time is increased approximately by approximately 1000 times compared to the transit time of the light in the 4 km or 2 km arms.

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An Elementary Treatise on Diff. Eqns. and Their Applns. by H. Piaggio


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