Warning points issued for harassment, trolling and incoherent and aggressive reporting on resulting posts.
In recent postings one of the new members Schneibster has given certain interpretations and asserts that the same are the prevalent mainstream views...since the views expressed by him are not held by many here and objectsions were raised, so it is pertinent that we all understand what is prevalent mainstream position on these points. [Moderator: You don't have the right to demand an answer. The named user has put you, according to recent posts, deservedly on ignore. In every case, you would have been better served writing a simple essay stating in positive terms what you believe and why you believe it rather than trying to tear down the position of another which you may not be fully equipped to understand.]
I had requested Mods to clear the air, even Schneibster urged Rpenner to put forth his views on one of the points, but he is yet to make any comments. [Moderator: You don't have the right to demand an answer.] I would request Rpenner/James R to give their views and also if possible organize some authoritative responses; are we missing Tashja ?
1. Cosmological Redshift is Doppler Shift. [Moderator: Observationally, cosmological redshift is indistinguishable from Doppler shift or gravitational redshift. Theoretically, anything less than full treatment in GR is subject to attack. Rhetorically, anyone starting a new thread to debate someone's breezy pop physics analogy commits an error by not citing the original claim in context. Socially, to start a new thread makes you look like you lack maturity and are engaged in a campaign of harassment.]
2. Spacetime is a thing (in Physical sense), otherwise how will it have curvature etc. [Moderator: What is treated like a real thing in physics is the geometry and curvature of space-time just like the electromagnetic field was treated like a real thing in Maxwellian electrodynamics. But relativity shows what was important in old EM theory was not the description of the E field and M field in any one set of coordinates but the geometric description of the EM field in general coordinates. So provisionally (until a better theory of space, time and electromagnetism comes along) the geometry of space-time is treated like a real thing. Colloquially, this means space-time is real thing. Arguing about if that's true is specious, unimportant and the promotion of form over substance. Creating a new thread to argue about that without citing the original claim in context is a breach of civility and best practices.]
3. Big Bang happened after Inflation. [Moderator: Big Bang cosmology is the observation that the earlier universe was hotter and denser and more uniform without empirical limits. All times when the universe was too hot and uniform to allow stars to form are part of Big Bang cosmology, because such conditions were terribly at odds with the old competitor called Steady State. Inflation is a mechanism proposed to allow the early universe to be super-uniform. To rigorously address any hypothetical first event in Big Bang cosmology one needs a theory of physics which correctly describes such events, which has never been part of the conversation. But many aspects of Big Bang cosmology must have happened long after the period when any hypothetical inflation mechanism was important and therefore after the hypothetical first event. Therefore this sentence makes no sense bereft of original context. Inflation, if it happened, was important during part of the Big Bang early universe. So creating a new thread to argue about it as if it was another's simple claim is a disservice to the forum community and betrays either a misunderstanding of cosmology or a willingness to write nonsense.]
I completely disagree on first two as his views are not the mainstream views, may be these views are held by a minority of Physicists but they do not represent the mainstream. [Moderator: Citation required.] Point # 3 is totally different from what is known to people at large, but this is a Hypothesis over Hypothesis, extremely speculative scenario leading to multiverse etc. So this cannot be termed as mainstream as yet. [Moderator: Nonsense.]
I will take up one by one....not my opinion but the opinion of mainstream guys, educational institutions.....Schneibster has to prove them wrong or outdated....or retract.
1. Cosmological Redshift is not Doppler Shift.....
List is endless...either these people are giving incorrect or outdated version of mainstream or Schneibster is pushing an opinion held by a few....He must retract or prove them wrong.
I had requested Mods to clear the air, even Schneibster urged Rpenner to put forth his views on one of the points, but he is yet to make any comments. [Moderator: You don't have the right to demand an answer.] I would request Rpenner/James R to give their views and also if possible organize some authoritative responses; are we missing Tashja ?
1. Cosmological Redshift is Doppler Shift. [Moderator: Observationally, cosmological redshift is indistinguishable from Doppler shift or gravitational redshift. Theoretically, anything less than full treatment in GR is subject to attack. Rhetorically, anyone starting a new thread to debate someone's breezy pop physics analogy commits an error by not citing the original claim in context. Socially, to start a new thread makes you look like you lack maturity and are engaged in a campaign of harassment.]
2. Spacetime is a thing (in Physical sense), otherwise how will it have curvature etc. [Moderator: What is treated like a real thing in physics is the geometry and curvature of space-time just like the electromagnetic field was treated like a real thing in Maxwellian electrodynamics. But relativity shows what was important in old EM theory was not the description of the E field and M field in any one set of coordinates but the geometric description of the EM field in general coordinates. So provisionally (until a better theory of space, time and electromagnetism comes along) the geometry of space-time is treated like a real thing. Colloquially, this means space-time is real thing. Arguing about if that's true is specious, unimportant and the promotion of form over substance. Creating a new thread to argue about that without citing the original claim in context is a breach of civility and best practices.]
3. Big Bang happened after Inflation. [Moderator: Big Bang cosmology is the observation that the earlier universe was hotter and denser and more uniform without empirical limits. All times when the universe was too hot and uniform to allow stars to form are part of Big Bang cosmology, because such conditions were terribly at odds with the old competitor called Steady State. Inflation is a mechanism proposed to allow the early universe to be super-uniform. To rigorously address any hypothetical first event in Big Bang cosmology one needs a theory of physics which correctly describes such events, which has never been part of the conversation. But many aspects of Big Bang cosmology must have happened long after the period when any hypothetical inflation mechanism was important and therefore after the hypothetical first event. Therefore this sentence makes no sense bereft of original context. Inflation, if it happened, was important during part of the Big Bang early universe. So creating a new thread to argue about it as if it was another's simple claim is a disservice to the forum community and betrays either a misunderstanding of cosmology or a willingness to write nonsense.]
I completely disagree on first two as his views are not the mainstream views, may be these views are held by a minority of Physicists but they do not represent the mainstream. [Moderator: Citation required.] Point # 3 is totally different from what is known to people at large, but this is a Hypothesis over Hypothesis, extremely speculative scenario leading to multiverse etc. So this cannot be termed as mainstream as yet. [Moderator: Nonsense.]
I will take up one by one....not my opinion but the opinion of mainstream guys, educational institutions.....Schneibster has to prove them wrong or outdated....or retract.
1. Cosmological Redshift is not Doppler Shift.....
http://cecelia.physics.indiana.edu/life/redshift.html said:It is tempting to refer to cosmological redshifts as Doppler shifts. This choice of interpretation has in the years since Hubble's work led to an unfortunate misunderstanding of big bang cosmology, obscurring one of its most mysterious beauties. As noted with a hint of frustration by cosmologists such as Steven Weinberg and Jaylant Narlikar and John Wheeler, "The frequency of light is also affected by the gravitational field of the universe, and it is neither useful nor strictly correct to interpret the frequency shifts of light...in terms of the special relativistic Doppler effect.".
By refering to cosmological redshifts as Doppler shifts, we are insisting that our Newtonian intuition about motion still applies without significant change to the cosmological arena. A result of this thinking is that quasars now being detected at redshifts of Z = 4.0 would have to be interpreted as traveling a speeds of more than V = Z x c or 4 times the speed of light. This is, of course, quite absurd, because we all know that no physical object may travel faster than the speed of light.
To avoid such apparently nonsensical speeds, many popularizers use the special relativistic Doppler formula to show that quasars are really not moving faster than light. The argument being that for large velocities, special relativity replaces Newtonian physics as the correct framework for interpreting the world. By using a special relativistic velocity addition formula the quasar we just discussed has a velocity of 92 percent the speed of light. Although we now have a feeling that Reason has returned to our description of the universe, in fact, we have only replaced one incomplete explanation for another. The calculation of the quasar's speed now presupposes that special relativity ( a theory of flat spacetime) is applicable even at cosmological scales where general relativity predicts that spacetime curvature becomes important. This is equivalent to a surveyor making a map of the state of California, and not allowing for the curvature of the earth!
The adoption of the special relativistic Doppler formula by many educators has led to a peculiar 'hybrid' cosmology which attempts to describe big bang cosmology using general relativity, but which is still firmly mired in the ruberik of special relativity. For instance, under the entry 'redshift' in the Cambridge Encyclopedia of Astronomy it is explicitly acknowledged that the redshift is not a Doppler shift, but less than two paragraphs later, the special relativistic Doppler formula is introduced to show how quasars are moving slower than the speed of light! It is also common for popularizers of cosmology to describe how 'space itself stretches' yet continue to describe the expansion of the universe as motion governed by the restrictions of special relativity. What's going on here?
http://astronomy.swin.edu.au/cosmos/c/cosmological+redshift said:Although cosmological redshift at first appears to be a similar effect to the more familiar Doppler shift, there is a distinction. In Doppler Shift, the wavelength of the emitted radiation depends on the motion of the object at the instant the photons are emitted. If the object is travelling towards us, the wavelength is shifted towards the blue end of the spectrum, if the object is travelling away from us, the wavelength is shifted towards the red end. In cosmological redshift, the wavelength at which the radiation is originally emitted is lengthened as it travels through (expanding) space. Cosmological redshift results from the expansion of space itself and not from the motion of an individual body.
List is endless...either these people are giving incorrect or outdated version of mainstream or Schneibster is pushing an opinion held by a few....He must retract or prove them wrong.