Was Mach's Principle Correct All Along?

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In summary: YOU been responsible for the discovery of something revolutionary and new in physics? I'm willing to wager that your answer is zero. So clearly, you're no different from the people you criticize. Perhaps you should take a step back and realize that before you start accusing others of not being "open-minded" or "asking the right questions". In summary, Mach's Principle is a concept that attributes inertial mass to an unknown species of integrated action-at-a-distance originating from all matter in the universe. It also suggests that the "fixed stars" provide a preferred frame of reference for measuring acceleration and rotation. However, from a modern perspective, this frame can now be replaced by a frame co-moving with
  • #1
oldman
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It is always convenient to raise something you don't quite understand to the status of a Principle. Mach's Principle seems to be a case in point; over the years it has greatly puzzled many Physicists and Philosophers. It certainly still puzzles me. Perhaps this forum can dispel some of my confusions.

As I understand it, Mach's Principle (MP) seems to attribute inertial mass to a quite unknown species of integrated action-at-a-distance, originating from all the matter in the universe. Mixed up with this principle is the idea that the "fixed stars" provide a preferred frame of reference, against which acceleration and rotation can be gauged. From a modern perspective Mach might have preferred to replace Newton's reference frame of absolute space, long out of fashion, with a frame co-moving with the galaxy clusters of the Hubble flow. Such a frame would now be set in the context of General Relativity, (GR), although MP is not thought to be a consequence of GR. Nevertheless it has a "global' (as distinct from "local") flavour in the relativistic sense.

General Relativity teaches that all inertial reference frames are equivalent. But from a local perspective it is now clear that there is one local inertial frame that can be picked out from the infinite number of such physically equivalent local frames. This is the frame at rest with respect to the Cosmic Microwave Background (CMB). From a local perspective this CMB frame restores Newton's absolute reference frame, but without imposing the restrictions of Galilean coordinate tranformations. From a global perspective there is no single (non co-moving) CMB frame. CMB frames, like the one we are coasting through at about 600 km/sec, are a local concept. Each locality, equipped with its infinite set of inertial frames, has its own unique local CMB frame that (in a model FRW universe) strictly follows the Hubble flow.

George Orwell might have claimed that this inertial frames is more equal than the rest!

I would like to ask: The CMB is thought to have been the photonic component of all mass/energy at decoupling; i.e. before gravitational condensation coagulated the universe. Could it, acting as a marker for all mass/ energy in the universe, somehow determine inertia and permit us to gauge acceleration and rotation? Or are we past such ideas?

Is it possible that Mach was in a sense right after all?
 
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  • #2
why do you think that mach was wrong?
as far as i can tell mach's principle was an attempt to refute Newton's bucket thought experiment, which he said that the concave shape of the water would occur even when the bucket and water are the only stuff in space.
as far as i can tell, a solution to this question is still open.
 
  • #3
Einstein believed that Mach was wrong, and that inertial effects arise from matter's motion relative to the local vacuum (ether) in which it is embedded. He rejected "spooky action-at-a-distance" out-of-hand. There may be no definitive proof that Einstein was right, but I'd not want to bet against him in this matter. In his 1920 book on relativity, his 1920 acceptance speech at Leyden, and his 1924 essay "On the Ether", Einstein went to great pains to point out that GR was not a complete theory, and that it lacked a viable mechanism for the emergence of gravitational and inertial effects. His contemporaries were horrified because by elevating the local vacuum to this level of importance, he was re-establishing the concept of the ether. I believe that Einstein was right, and that current research into the fine-scale structure of space (LQG) may eventually bear him out.
 
  • #4
turbo-1 said:
His contemporaries were horrified because by elevating the local vacuum to this level of importance, he was re-establishing the concept of the ether. I believe that Einstein was right, and that current research into the fine-scale structure of space (LQG) may eventually bear him out.

But your statement here is horribly inaccurate. Einstein had ZERO concept of the vacuum state that we now deal with. In fact, considering that he was very much against the EPR-type interaction, he would have been horrified at the same type of vacuum interactions that is envisioned not only within LQG, but also in String, etc. This is NOT the same type of "ether" that Einstein had in mind, if it is at all. In fact, other than you and some other fringe articles, no one is calling such things as "ether", because it is utterly misleading.

Zz.
 
  • #5
ZapperZ said:
But your statement here is horribly inaccurate. Einstein had ZERO concept of the vacuum state that we now deal with. In fact, considering that he was very much against the EPR-type interaction, he would have been horrified at the same type of vacuum interactions that is envisioned not only within LQG, but also in String, etc. This is NOT the same type of "ether" that Einstein had in mind, if it is at all. In fact, other than you and some other fringe articles, no one is calling such things as "ether", because it is utterly misleading.

Zz.
Einstein called the vacuum the ether in part because he required it's existence to support the transmission of light through space, and this was fundamental to his idea of gravitational lensing.

In the second place our result shows that, according to the general theory of relativity, the law of the constancy of the velocity of light in vacuo, which constitutes one of the two fundamental assumptions in the special theory of relativity and to which we have already frequently referred, cannot claim any unlimited validity. A curvature of rays of light can only take place when the velocity of propagation of light varies with position.

http://www.bartleby.com/173/22.html

Sometimes, people on the fringe are right, or at least are asking the right questions.
 
  • #6
turbo-1 said:
Sometimes, people on the fringe are right, or at least are asking the right questions.

But often times, and more often than you can imagine, they go NOWHERE. Have you ever considered that? How many times, for example, have YOU contributed anything to physics that actually had an an impact? Based on that track record, how can you equate yourself with those who actually got it "right"?

You STILL haven't argued any anything in LQG has any resemblance to what Einstein had in mind. Just because it hops on 2 legs does not automatically make it a rabbit. That is what you are trying to argue, and it make no logical sense.

Zz.
 
  • #7
ZapperZ said:
But often times, and more often than you can imagine, they go NOWHERE. Have you ever considered that? How many times, for example, have YOU contributed anything to physics that actually had an an impact? Based on that track record, how can you equate yourself with those who actually got it "right"?
I have been collaborating with a researcher in Finland and another in New York for the past year and a half regarding a certain class of interacting galaxies. The first paper is in process. When the paper is accepted for publication, I will gladly link the preprint on this forum. That paper will present our catalog and raw data. The second and third papers (statistical analysis and interpretation) will likely have an impact.

ZapperZ said:
You STILL haven't argued any anything in LQG has any resemblance to what Einstein had in mind. Just because it hops on 2 legs does not automatically make it a rabbit. That is what you are trying to argue, and it make no logical sense.

Zz.
OK, Fotini Markopoulou has posited that light interacts with the vacuum through which it propagates, and she believes that Glast may demonstrate a frequency-dependent lag in arrival times of EM from Gamma-ray bursts, demonstrating that light interacts with the small-scale structure of space, which the LQG folks have called spin-foam. If Einstein were alive today, I believe that he would be very interested in the work of our friends at the Perimeter Institute. I'm surprised that you had not heard of this.
 
  • #8
loop quantum gravity said:
why do you think that mach was wrong?
as far as i can tell mach's principle was an attempt to refute Newton's bucket thought experiment, which he said that the concave shape of the water would occur even when the bucket and water are the only stuff in space.
as far as i can tell, a solution to this question is still open.


Thanks for this comment. I just don't know whether Mach was right or wrong, but it seems that the answer to my OP question "... are we past such ideas? " is simply: NO.

As for the "hanna-hanna" and "wurra-wurra" raised by ZapperZ about LQG's bearing on this matter... since there seems to as yet be no answer to this kind of question, why not give new ideas a whirl, as Turbo-1 sensibly suggests:
Sometimes, people on the fringe are right, or at least are asking the right questions.
 
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  • #9
loop quantum gravity said:
why do you think that mach was wrong?
as far as i can tell mach's principle was an attempt to refute Newton's bucket thought experiment, which he said that the concave shape of the water would occur even when the bucket and water are the only stuff in space.
as far as i can tell, a solution to this question is still open.

Newton used an absolute space in which his physical laws work - many philosophers rejected this idea. The famous bucket experiment was for Newton "the proof" for the existence of an absolute space - but Mach rejected and prooved that this is not a proof. If the absolute space would cause the shape of the water - then you must perform the experiment in an empty space to exclude the possibility that (motion relative to) other masses cause the shape of the water. Mach in general rejected the existence of an absolute space - it is meta-physical; positions and velocities with respect to an absolute space are not observableand therefore are meta-physical.
 

What is the meaning of "Was Mach right after all?"

"Was Mach right after all?" refers to the debate surrounding the Austrian physicist and philosopher Ernst Mach's ideas about the nature of space and time.

Who was Ernst Mach and what did he believe?

Ernst Mach was an Austrian physicist and philosopher who lived from 1838 to 1916. He is best known for his contributions to the field of mechanics and his influence on the development of the theory of relativity. Mach believed that all motion is relative and that the concept of absolute space is unnecessary.

What are the key arguments for and against Mach's ideas?

One of the main arguments for Mach's ideas is that they helped pave the way for Albert Einstein's theory of relativity. Mach's ideas also challenged the traditional notions of space and time and encouraged scientists to think critically about these concepts. On the other hand, some argue that Mach's ideas are too idealistic and do not fully align with empirical evidence.

How have Mach's ideas influenced modern physics?

Mach's ideas have had a significant impact on modern physics, particularly in the development of the theory of relativity. His ideas also sparked further discussions and research on the nature of space and time, and continue to be a topic of debate among scientists today.

What is the current consensus on Mach's ideas?

While Mach's ideas were initially met with skepticism, they have gained more acceptance in modern physics. However, there is still ongoing debate and research on the validity and implications of Mach's ideas in understanding the nature of space and time.

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