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Friends,
Last year I had held detailed discussions in these forums, on the feasibility of experimental detection of absolute motion. http://groups.google.com/group/sci.a...5663e989aca999 Subsequently I compiled a formal paper titled "Proposed experiment for detection of absolute motion" and submitted to Physics Essays (An International Journal dedicated to fundamental questions in Physics) for publication. After a detailed peer review, this paper has now been published in this journal [http://www.physicsessays.com/]. The abstract of this paper is reproduced below. "According to special theory of relativity, all motion is relative and existence of any privileged or absolute inertial frame of reference, which could be practically distinguished from all other inertial frames, is ruled out. However, we may define an absolute or universal reference frame as the one which is at rest with respect to the center of mass of the universe and assume the speed c of propagation of light to be an isotropic universal constant in that frame. Any motion with respect to such a reference frame will be called “absolute motion.” The proposed experiment establishes the feasibility of detection of such an absolute motion by measuring the up-link and down-link signal propagation times between two fixed points on the surface of earth. With current technological advancements in pulsed lasers, detectors, precision atomic clocks, and computers, feasibility of the proposed experiment has been confirmed. Successful conduct of the proposed experiment will initiate a paradigm shift in fundamental physics. ©2010 Physics Essays Publication" Phys. Essays 23, 442 (2010) http://physicsessays.aip.org/getabs/...ifs=Yes&ref=no In brief, the proposed experiment involves measurement of to and fro light propagation times between two fixed points on earth. Let us consider two points A and B fixed on the surface of earth (at equal gravitational potential) and aligned along east-west direction. Let the separation distance AB be about 30 to 50 km. Position two identical precision atomic clocks mid-way between A and B and mutually synchronize them in close-by position. After synchronizing, shift the two clocks to stations A and B by slow transport. Now as part of the experiment, send a light pulse from A to B and record its time of flight with the two clocks at A and B. Let this measured time of flight be T_ab. Then send another light pulse from B to A and record its time of flight with the two clocks. Let this measured time of flight be T_ba. Repeat these to and fro time of flight measurements for a period of 24 hours. Find the maximum difference in the to and fro flight times, |T_ab-T_ba| over the test period. As per SR (if the second postulate is true), this to and fro flight time difference |T_ab-T_ba| must be of the order of zero (or a random scatter of values within +/- 5 nanoseconds). On the other hand, if the second postulate is not true, then the maximum difference in the to and fro flight times, |T_ab-T_ba| is expected to be in the range of about 200 nanoseconds. An estimated cost of the test equipment (including Cesium atomic clocks and pulsed lasers) is within $40,000. The proposed experiment can be conducted by many space agencies, research centers and academic institutions provided they get motivated for undertaking this challenging task. The proposed method of detecting absolute motion in space is considered very simple but unique, the like of which has not been conducted by anyone as yet. It is unique in the following respects. (a)There is no attempt to measure the one-way or two-way speed of light. (b)There is no need to measure the distance between the two fixed points on the surface of earth for conducting this experiment. (c)There is no dependence on the wave properties of light for measuring any interference effects or fringe shifts. It does not involve any reflection of waves from moving mirrors. (d)For detecting absolute motion in space, we only need to measure the up-link (T_ab) and down-link (T_ba) signal propagation times between two locations on the surface of earth. It does not require the use of any satellite or the GPS system. (e)The result depends on the difference between T_ab and T_ba, due to which the hardware delays and atmospheric signal propagation delays get canceled out and do not influence the result. Commercially available Cesium atomic clocks provide time measurement accuracy of the order of about one nanosecond, which is sufficient for the conduct of the proposed experiment. I am sure that whenever and whichever agency conducts the proposed experiment, an absolute motion in the form of a unique velocity vector of the solar system in the absolute space, will be detected. I only wonder whether NASA or any other agency/institution will come forward to conduct this experiment first. G S Sandhu http://book.fundamentalphysics.info/ |
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