
Originally Posted by
Nereid
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Originally Posted by VanderL
You left out a few possibilities don't you think? EM-fields can also accelerate and condense matter, the force may not be "new".
Hmm ... so you've developed a model, based on "EM-fields", which "accelerate[s] and condese[s] matter", and which accounts for the observed rotation curves?
Would you be so kind as to provide us with a link to the paper you published on this topic?
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And which bands of EM radiation are not observable?
The main band is the EUV - blueward of the Lyman limit (except, of course, very locally, and in a few clearings, such as the Lockman hole). Neutral H is very good at absorbing UV at wavelengths of 90nm and lower. As the part of the MW galaxy we live in has a great deal of such neutral H (except in a few clearings), we can't 'see' very far in this band.
The other significant 'not observable' band is redward of ~1-10 kHz (in the low frequency radio band). This blindness arises from a well-known plasma phenomenon (I'm sure Ian can give you chapter and verse, in the offchance that you yourself aren't familiar with it).
However, if I may be so bold, what expectations do you have re significant amounts of matter (in the context of galaxy rotation curves) that might be 'unobservable'? Of course, given your oft-stated views, I am referring to baryonic matter.
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Originally Posted by Eta C
So, what's a scientist to do?
Acknowledge that something fundamental is wrong
Why? I mean:
- there are no other indications that GR is 'wrong' (indeed, it has passed all the tests with flying colours)
- there are very good, non-astrophysical, reasons for considering the existence of 'dark matter' (from neutrinos, to the inescapable conclusion that the Standard Model of particle physics is incomplete, and many things in between)
- some form of non-baryonic matter is consistent with good observational results in other astrophysical domains.
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The first choice is number 1. The current theories are well supported by a vast number of other observations, so initially we assume they're correct and that there is some other missing or "dark" matter. It's a much more drastic choice to go for number two and assume that everything we know is wrong and go for a totally new theory. Unfortunately, that's the choice most ATM advocates prematurely go for.
You can call it prematurely, but how long must we accept this dark matter fudging before we call it a day?
VanderL, we've been over this point dozens of times, both in this thread and others in UT and BA.
The short answer is, either
a. until the inconsistencies become quite intolerable
b. until a better alternative theory is produced
c. both the above.
You, an outside observer*, are fond of calling key aspects "fudging".
You, a self-professed supporter of alternative ideas, cannot defend even mild, tentative challenges to the alternatives you proclaim, much less the rigours of technical journal publication.
And that's OK; you are totally free to believe, proclaim, declare, ... whatever you wish.
However, if you wish to understand how the folk doing the real work in astrophysics and cosmology go about that work; to learn why 'dark matter' was introduced into astrophysics; even to see how modern astrophysics is a thoroughly scientific endeavour per the best work in HPS ... then, please, either engage in the discussion constructively, roll up your sleeves and start to lift the EU alternative out of its thirty-year quantitative drought, or find another forum more accommodating to your beliefs.**
*I freely admit that this statement is based on little data. If you have published in ApJ, PRL, AA, MNRAS, etc, please let us know; I will then - loudly - retract this statement.
**for avoidance of doubt, this is Nereid the BAUT member speaking; it is not, I repeat NOT, Nereid the BAUT moderator speaking.