Conventional Cosmology Critique
www.CellularUniverse.org
COMMENTS:
On model tinkering in the Ptolemaic tradition
Every now and then it is enlightening to
check on the "progress" of conventional cosmology, which, as everyone
knows, embraces the expanding-universe model ---popularly called the Big
Bang model.
The basic Big Bang has a parameter called the scaling factor.
Think of it as the radius of the growing universe. It gets bigger as the
Big Bang universe gets bigger. Technically it is the derivative of this
scaling factor that describes the rate with which the universe is
expanding. It is a measure of the speed of the expansion of the expanding
universe. Simple enough.
However, the model holds that the speed changes over time. For many
years it was believed that the expansion speed was slowing down. But
careful astronomical observations, notably in 1998, revealed that this was
not the case. Expansion wasn't tapering off. It seemed to be ramping up!
Rather than abandon the model, the experts came up with accelerated
expansion. Henceforth they employed an acceleration parameter, which,
technically, is the second derivative of the scaling factor. (If you
are keeping count, that makes three parameters available for theory
manipulation.) As the story goes the universe not only expands but it
expands faster and faster. End of story? No. ...
A few years after that notable crisis of
1998 it was gradually revealed, through even more careful and ever deeper
astronomical observations, that uniform accelerated expansion still
wasn't the answer. (Now at this stage any conscious-and-rational person
would have abandoned the Big-Bang ship especially since there are far
superior models floating around.) Having maintained a tradition of
commitment going back as far as the 1920s when Lemaître formalized the
explosion-idea, abandonment was not an option. And so the experts now came
up with another parameter. Yes, a fourth adjustable factor. Admittedly it
is not very original. If you can't connect with the underlying reality of
the expansion process at least you can connect with the differential
calculus. Ready for this one? The new parameter is the third derivative of
(you guessed it) the scaling factor. They call it the jerk parameter
and means exactly what it says.
Now I assure you I am not making this up
---and in a moment I will do more than assure you by providing the
reference source.
The experts even tell us when, in the
past of the Big Bang, this supposed jerk occurred. (It corresponds to
z = 0.5 or about 5.4 gigayears ago when the universe was 9.2 gigayears old
assuming a Hubble constant, H0 = 20 km/s/Mly.
[1]) Think about this
for a moment; a jerk-event occurred at some particular period of cosmic
time. A special identifiable time! What this means is that the BB universe
now has no less than three special moments in time during its existence:
The beginning time (t=0), the end-of-inflation time, and the
jerk time; all in violation of the cosmological principle
(strong version)! It means a violation of the generally accepted rule that
a real universe must have no special time or place.
It is little wonder that
physicists and cosmologists consider the expanding universe model to be
preposterous! Physicist Sean M. Carroll even named his website "preposterous
universe." And he goes into some detail in his paper, The Cosmological Constant, available at
http://relativity.livingreviews.org/Articles/lrr-2001-1.
Undeterred by considerations of
preposterousness and implausibility, a group of experts, using the latest
high-z supernovae discoveries, presented their ideas for 'improvements' to
the Big Bang. The research paper,
[2] authored by no less than 19
physicists/astronomers, was published in the Astrophysical Journal, June
2004. (See, Riess et al., ApJ 607, 665 (2004)
http://arxiv.org/abs/astro-ph/0402512 )
Their problem can be expressed this way:
For a growing collection of remote supernova events the redshift-distance
curve does not agree with the magnitude-distance curve (magnitude =
apparent brightness). The challenge is to get the theoretical curve
(the redshift-distance graph) to agree with the empirical curve (the
magnitude-distance graph).
And that is why the scaling factor derivatives are so useful. If it is
mathematically necessary to invoke a fourth or even fifth derivative of the
scaling factor, to force-fit the curves, then so be it. The Big Bang,
being, as it is, a mathematical model, literally cannot fail.
What we
are witnessing in conventional cosmology is the "keeping up the
appearances" in the best Ptolemaic tradition.
---C.R. 2008
July
Notes and References
- ^ Ned Wright's Javascript Cosmology Calculator
www.astro.ucla.edu/~wright/CosmoCalc.html
- ^
Type Ia Supernova Discoveries at z > 1 From the Hubble
Space Telescope: Evidence for Past Deceleration and Constraints on Dark
Energy Evolution, Riess et al., ApJ 607, 665 (2004)
http://arxiv.org/abs/astro-ph/0402512
|