I've done my own research and I don't see any tangible evidence to support the idea. I was specifically interested in *your* opinion, not my own.
Falsification is somewhat of a mirage; large parts of science consist of strictly unfalsifiable hypotheses - particularly existential hypotheses; i.e. statements that assert the existence of something cannot be falsified by failure to find it (caveat below). The point of testing these hypotheses is to find that something, or raise your confidence level that it doesn't exist to the point of being beyond reasonable doubt (this implies constrained circumstances; e.g. you can test whether a dragon exists in your garage, but not in general).
Alright, I tend to agree with that assessment. But then how will you know if dark matter does not actually exist in your own lifetime if you simply "assume" it does exist and the outcome of experiments won't/can't change that "belief"? Usually the burden of proof works the other way around, and a lack of evidence equates to a lack of belief.
If one reason was people's beliefs in spiritual experiences, I've explained that there are far better explanations;
That's a subjective belief however and you're also in the minority.
I don't recall the other. I was after a clear explanation of how you came to your 'cosmic brain' idea.
Let's try this approach: Suppose for a second that we both agree on a purely empirical EU/PC based description/definition of the cosmos. The question then arises, "Why do the mass layout patterns and current flow patterns of the universe look so much like the "intelligence" centers of living organisms on Earth?
We could just assert it pure coincide, or we could propose the notion that the universe itself is an intelligent organism. In the later case, we would need to offer a FTL communication mechanism.
Guth's inflation was proposed to explain and integrate a number of unexplained and seemingly unrelated observations, which it did (and more) successfully.
Hmm. I suppose we'll have to agree to disagree since his original proposal was intended to explain why monopoles don't exist which is like claiming your theory explains why unicorns do not exist. It was also intended to explain why the universe is homogeneous, but the Planck data shows hemispheric variations that defy that assertion. The last 'reason' he offered was the "flat" thing, and even that seems rather dubious. It's a concept that can literally be traced back to originating in the imagination of a single individual at one point in time.
There are a number of potential explanations that are consistent with fundamental physical laws, including the Higgs field, if it couples to gravity (e.g.
Inflation & Higgs,
Inflation and the Higgs scalar, etc.).
How would it "couple" to a GR oriented definition of gravity since GR is the theory that defines gravity in LCDM? It sound's like you want your QM cake but you want to eat your GR cake everywhere else.
Whether Penrose is right remains to be seen, but as Guth proposed inflation partly to account for the flatness problem, their ideas are clearly in conflict.
So how do I decide who's right and who's wrong? It's not like I can go to the lab and find out.
My concept of scientific competence is informed by the work of people who've spent their education and careers working in the field,
Be that as it may, even after all those years of studying this stuff they're still ultimately relying upon 95 percent placeholder terms for human ignorance to describe the universe, they have no idea where dark energy comes from, or how it retains constant density during expansion. It's not like they even profess to have all the answers, in fact they mostly have no answers at all.
rather than some bloke on the internet who is favours fringe theories,
Evolutionary theory was once a "fringe theory" if all we're talking about is 'popularity'. My beliefs are based upon pure empirical lab tested physics and they work in the lab.
display little understanding of basic physics or science in general,
That's just nonsense. I know far more about LCDM that most LCDM proponents know about EU/PC theory. You seem to take the low road in debate at times.
and thinks he knows better than the experts. YMMV.
I know EU/PC better than any LCDM proponent on the planet. I'm not sure what you think they 'know' to begin with since most of their theory is based on things they *don't* profess to know or understand in the first place, and those failed DM "tests" don't suggest they have any actual "knowledge".
It's impossible to say - they may find a candidate particle, or they may exhaust the accessible candidates, or a better solution may come along, or it may be demonstrated that a particle cannot explain the phenomenon.
After finding two "halos" of gas and plasma over the past five years, *exactly* as their DM models predict, I'm inclined to believe that ordinary matter is a 'better solution" to those observations. They've literally found more mass in the past five years than all the mass they knew to exist prior to 2012. How then can I have any confidence in their mass estimates of galaxies based on their "brightness"?
Gravitational lensing shows dark matter must be relatively small,
Actually if you had read that Thunderbolts link I suggested you'd learn that they were underestimating the number of entire stars in that bullet cluster study by between 3 and 20 times depending on the size of the star and the type of galaxy. Those gas and plasma halos we found in the last five years are also made of smaller particles.
and that quantity of macro-scale matter would accrete into large objects; gas and dust would fit, but would glow (ie. not be dark);
Those underestimated stars weren't "dark". The plasma and gas in those recently discovered halos wasn't "dark" either, but we didn't have a clue they were there in 2006 when that bullet cluster study took place.
and big bang nucleosynthesis calculations and the CMBR asymmetries indicate that there's far too little dark baryonic matter to account for the observed phenomena.
That's only true if you *assume* that photon redshift is related to expansion and you ignore Eddington's predictions about the average temperature of space based on scattering, which he *nailed* to within 1/2 of one degree. It took BB'er 3 or 4 tries to any closer than Eddington.
I hear there are plenty more reasons that are less amenable to simple explanation.
I don't find any of them particular compelling and the lab results speak for themselves.
I have no beliefs about it, falsifiable or otherwise.
Yet you're defending their model which does indicate "belief".
That is a fundamental misunderstanding of how science works. If a scientist says they 'believe' that X or Y is true, what they mean is they think it's the best available or most likely explanation - and they acknowledge that it may be wrong. If that's not what they mean, they're not being scientific about it.
But since DM has failed every test, and their mass estimates were shown to be flawed, how can exotic matter still be the 'best' explanation? Define "best". That sounds subjective, not objective.
As for falsifiability, Popper's ideal is unachievable; in reality, much of science is inductive, and good science has been falsified - see
Popper's Falsification.
Well then falsification becomes highly problematic for all hypothetical constructs and concepts.