Pentcho Valev
2018-12-04 11:11:49 UTC
Initially Einstein had a problem with the invariability of the speed of light - it is obviously nonsense:
John Stachel: "But this seems to be nonsense. How can it happen that the speed of light relative to an observer cannot be increased or decreased if that observer moves towards or away from a light beam? Einstein states that he wrestled with this problem over a lengthy period of time, to the point of despair." http://www.aip.org/history/exhibits/einstein/essay-einstein-relativity.htm
The speed of light relative to an observer (receiver) IS increased if that observer moves towards a light beam:
Stationary emitter; moving receiver: Loading Image...
(Website: http://www.einstein-online.info/spotlights/doppler.html)
The speed of the light pulses relative to the emitter is
c = df
where d is the distance between the pulses and f is the frequency measured by the emitter. The speed of the pulses relative to the receiver is
c'= df' > c
where f' > f is the frequency measured by the receiver.
In the end Einstein found it profitable to introduce the nonsense. Then, for more than a century, Einsteinians have been procrusteanizing physics upon the bed of the nonsensical invariability. In particular, space and time were tragically vandalized:
Peter Galison: "Only by criticizing the foundational notions of time and space could one bring the pieces of the theory - that the laws of physics were the same in all constantly moving frames; that light traveled at the same speed regardless of its source - into harmony." https://www.aip.org/history/exhibits/einstein/essay-einsteins-time.htm
Nowadays fundamental physics is much more insane than, say, flat-earth myths. For instance, physicists gloriously jump, within a minute of their experienced time, sixty million years ahead in the future, and trap unlimitedly long objects, in a compressed state, inside unlimitedly short containers:
Thibault Damour: "The paradigm of the special relativistic upheaval of the usual concept of time is the twin paradox. Let us emphasize that this striking example of time dilation proves that time travel (towards the future) is possible. As a gedanken experiment (if we neglect practicalities such as the technology needed for reaching velocities comparable to the velocity of light, the cost of the fuel and the capacity of the traveller to sustain high accelerations), it shows that a sentient being can jump, "within a minute" (of his experienced time) arbitrarily far in the future, say sixty million years ahead, and see, and be part of, what (will) happen then on Earth. This is a clear way of realizing that the future "already exists" (as we can experience it "in a minute")." http://www.bourbaphy.fr/damourtemps.pdf
"These are the props. You own a barn, 40m long, with automatic doors at either end, that can be opened and closed simultaneously by a switch. You also have a pole, 80m long, which of course won't fit in the barn. [...] So, as the pole passes through the barn, there is an instant when it is completely within the barn. At that instant, you close both doors simultaneously, with your switch. [...] If it does not explode under the strain and it is sufficiently elastic it will come to rest and start to spring back to its natural shape but since it is too big for the barn the other end is now going to crash into the back door and the rod will be TRAPPED IN A COMPRESSED STATE inside the barn." http://math.ucr.edu/home/baez/physics/Relativity/SR/barn_pole.html
Loading Image...
Pentcho Valev
John Stachel: "But this seems to be nonsense. How can it happen that the speed of light relative to an observer cannot be increased or decreased if that observer moves towards or away from a light beam? Einstein states that he wrestled with this problem over a lengthy period of time, to the point of despair." http://www.aip.org/history/exhibits/einstein/essay-einstein-relativity.htm
The speed of light relative to an observer (receiver) IS increased if that observer moves towards a light beam:
Stationary emitter; moving receiver: Loading Image...
(Website: http://www.einstein-online.info/spotlights/doppler.html)
The speed of the light pulses relative to the emitter is
c = df
where d is the distance between the pulses and f is the frequency measured by the emitter. The speed of the pulses relative to the receiver is
c'= df' > c
where f' > f is the frequency measured by the receiver.
In the end Einstein found it profitable to introduce the nonsense. Then, for more than a century, Einsteinians have been procrusteanizing physics upon the bed of the nonsensical invariability. In particular, space and time were tragically vandalized:
Peter Galison: "Only by criticizing the foundational notions of time and space could one bring the pieces of the theory - that the laws of physics were the same in all constantly moving frames; that light traveled at the same speed regardless of its source - into harmony." https://www.aip.org/history/exhibits/einstein/essay-einsteins-time.htm
Nowadays fundamental physics is much more insane than, say, flat-earth myths. For instance, physicists gloriously jump, within a minute of their experienced time, sixty million years ahead in the future, and trap unlimitedly long objects, in a compressed state, inside unlimitedly short containers:
Thibault Damour: "The paradigm of the special relativistic upheaval of the usual concept of time is the twin paradox. Let us emphasize that this striking example of time dilation proves that time travel (towards the future) is possible. As a gedanken experiment (if we neglect practicalities such as the technology needed for reaching velocities comparable to the velocity of light, the cost of the fuel and the capacity of the traveller to sustain high accelerations), it shows that a sentient being can jump, "within a minute" (of his experienced time) arbitrarily far in the future, say sixty million years ahead, and see, and be part of, what (will) happen then on Earth. This is a clear way of realizing that the future "already exists" (as we can experience it "in a minute")." http://www.bourbaphy.fr/damourtemps.pdf
"These are the props. You own a barn, 40m long, with automatic doors at either end, that can be opened and closed simultaneously by a switch. You also have a pole, 80m long, which of course won't fit in the barn. [...] So, as the pole passes through the barn, there is an instant when it is completely within the barn. At that instant, you close both doors simultaneously, with your switch. [...] If it does not explode under the strain and it is sufficiently elastic it will come to rest and start to spring back to its natural shape but since it is too big for the barn the other end is now going to crash into the back door and the rod will be TRAPPED IN A COMPRESSED STATE inside the barn." http://math.ucr.edu/home/baez/physics/Relativity/SR/barn_pole.html
Loading Image...
Pentcho Valev