Gas damping force noise on a macroscopic test body in an infinite gas reservoir |
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Authors: | A Cavalleri R Dolesi D Nicolodi S Vitale WJ Weber |
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Institution: | a Centro Fisica degli Stati Aggregati, 38050 Povo, Trento, Italy b Dipartimento di Fisica, Università di Trento, and INFN, Gruppo di Trento, Via Sommarive 14, 38100 Povo (TN), Italy |
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Abstract: | We analyze here the force noise associated with the mechanical damping of a test body surrounded by a large volume of rarefied gas, considering the statistics of momentum exchange in inelastic molecular collisions. In addition to calculating the force noise on a cube, sphere, and cylinder, we discuss the limits in applying this analysis to experimental configurations in which the test body is surrounded by an enclosure that is only slightly larger than the test body itself. |
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Keywords: | Gas damping Brownian noise Small forces |
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