| Test Particle |
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| mathematical methods in general relativity | |
| SHOPPER'S DELIGHT | |
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In physical theories, a test particle is an idealised model of a small object some of whose physical properties (usually Mass ) are assumed to be negligible. The concept of a test particle simplifies some problems, and often provides a good approximation for physical phenomena in a specified Domain Of Applicability . TEST PARTICLES IN GENERAL RELATIVITY In metric theories of gravitation, particularly General Relativity , a test particle is an idealized model of a small object whose mass is so small that it does not appreciably disturb the ambient graviational field. According to the Einstein Field Equation , the gravitational field is locally coupled not only to the distribution of non-gravitational Mass-energy , but also to the distribution of Momentum and Stress (e.g. pressure, viscous stresses in a Perfect Fluid ). In the case of test particles in a Vacuum Solution or Electrovacuum Solution , this turns out to imply that in addition to the tidal acceleration experienced by small clouds of test particles (spinning or not), ''spinning'' test particles may experience additional accelerations due to Spin-spin Force s. SEE ALSO
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