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quote:Originally posted by Solvay_1927Turbo - I'm not familiar with the topic you describe - can you give more info / a web link?Thanks.Paul.
quote:This is an indication that light travels faster the farther the probes get from the Sun.
quote:Originally posted by DoctorBeaverquote:This is an indication that light travels faster the farther the probes get from the Sun.Why was that unexpected? I would have thought it entirely logical. The closer to the sun you are, the more intense the solar wind hence more particles for photons to interact with.
quote:Has the Casimir effect been demonstrated other than in the vicinity of matter (metal sheets or whatever)? Does it prove that there is virtual particle-antiparticle creation & annihilation throughout space, not just in the vicinity of matter? (I accept that this is suggested by QFT, but I've never really thought about it in this way before - how can you tell it happens even in a "vacuum" several metres away from any matter?)
quote:There is a force associated with the electromagnetic quantum vacuum: the Casimir force. This force is an attraction between parallel metallic plates that has now been well measured and can be attributed to a minutely tiny imbalance in the zero-point energy in the cavity between versus the region outside the plates. This is not useful for propulsion since it symmetrically pulls on the plates. However if some asymmetric variation of the Casimir force could be identified one could in effect sail through space as if propelled by a kind of quantum fluctuation wind. This is pure speculation
quote:you can only measure the location of a photon when it interacts with matter - you can never know for sure where the photon has been other than at the points where you emit it or measure it
quote:VSL speculates that c was faster at the beginning of the universe. How could this be and ALSO include SR with a constant c?
quote:Alternatively I tend to prefer to see it as evidence that some sort of evolutionary process has already taken place as the physical laws "settled down" during the initial stages of the big bang. This process maximises the complexity and longevity of any universe as it is formed.
quote:can anyone tell me what hard evidence we have for the constancy of the speed of light? (i.e. evidence that different people/instruments will always measure c - in a vacuum - to be the same speed, irrespective of their motion relative to the source.)But is there any further experimental evidence or theoretical reasons why c must be constant? Any help would be much appreciated. Many thanks.
quote:Originally posted by Soul SurferYou should read the book "the end of time" by Julian Barbour a respected cosmologist who explains a lot of quantum wierdness by suggesting that we should think of a timeless universe in which all the possible sequential configurations occur at all times and our observation creats a set of world lines witihn this much vaster universe of quantum potential. It is quite readable and does not make very great mathematical demands on the readerLearn, create, test and tellevolution rules in all thingsGod says so!
quote:Originally posted by Soul SurferI have already mentioned Roger Penrose's "Road to Reality" elsewhere on this forum. This starts with an assumption of very little mathematical knowledge and takes you all the way to quantum gravuty and string theory including tensor calculus etc. It's the best and most readable maths book that I know.Learn, create, test and tellevolution rules in all thingsGod says so!