PETER !!!
I was wondering when you'd show up,...good to see you again,... (baltoro, here...)
Weird,...I was reading a book just recently about the Dark Matter/ Dark Energy "problem"
"The 4 % Universe: Dark Matter, Dark Enery, and the Race to Discover the Rest of Reality", author: Richard Panek, 2011
Here is a review of the book:
Exploring the Dark Universe, American ScientistHowever, I would NOT recommend this book. Although it is well-written, and depicts the evolution of the thinking of the astrophysicists and astronomers that have published on the subject in research journals,...it really isn't very skeptical of the science. There is NO rigorous or empirical analysis of the subject. It leaves you even more confused about just what Dark Matter actually is than when you started the book.
FORTRANS...above...describes the situation in condensed form.
Much of the development of the logic is based on the values for
Omega, the Density Parameter and
Lambda, the Cosmological Constant.
The Big Bang Theory gave birth to cosmology as a science,...but, it is almost completely hypothetical,...and, the existence of Dark Matter to explain certain observed anomalies is very controversial.
...I get the distinct impression that cosmologists use the term "Dark Matter" to designate that which they do not adequately understand,...