Re: Galaxy distortions shed light on cosmic acceleration

On 31 jan, 12:56, Sam Wormley <sworml...@xxxxxxxxx> wrote:
srp2...@xxxxxxxxx wrote:
On 30 jan, 22:35, Sam Wormley <sworml...@xxxxxxxxx> wrote:
Galaxy distortions shed light on cosmic acceleration
http://physicsworld.com/cws/article/news/32648

This time ten years ago, two independent teams of researchers in the
US were deliberating over whether to go public with a discovery that
would change our view of the universe forever. It concerned
observations of distant supernovae that appeared to be moving away
from each other faster than they should have been. A few weeks later
the world found out that the expansion of the universe is
accelerating, probably driven by some kind of gravitationally
repulsive "dark energy" that makes up 75% of the universe.

See:http://physicsworld.com/cws/article/news/32648

Quote
"A few weeks later the world found out that the expansion of
the universe is accelerating, probably driven by some kind of
gravitationally repulsive "dark energy" that makes up 75% of
the universe.

Fast-forward a decade and physicists still have no idea what
dark energy is. It may not even exist at all:"

A perfect example of self-consistency.

Quote:

"the cosmic acceleration could instead signal that it is time
to replace Einstein's general theory of relativity with a new
theory of gravity."

Hey Sam. Remember that GR is perfect and has never
failed us. All of the obviously hanging loose ends must be
explainable with gas venting and other side-stepping hoopla.

You must be remembering that there has never been a prediction
of GTR that's been contradicted by an observation.

I remember at least the well known and ofttime mentioned prediction
of GR that was contradicted by observation. The trajectories
predicted
by GR for Pioneer 10 and 11 were definitely contradicted by
observation.

It also predicted that the axial spin of both Pioneers would not
slow down, contradicted by observation.

It also predicts that the rotation of the Earth will be faster at
perihelion than at aphelion, while the opposite is observed.

Just from memory.

It may turn out that "Dark Energy" will accurately be modeled
by a non-zero cosmological constant term in GTR.

Doubtful if they can't even detect it.

But seems to me that this still leaves the above mentioned
anomalies.

Quote:
"When Edwin Hubble showed in 1929 that the red-shift of
distant galaxies is proportional to their distance from Earth,
it proved that the universe was expanding."

Not really. It was interpreted "again" as the Earth becoming
again the familiar center of the universe. Back to geocentrism.

Quote:
"The error bars are too large to tell us anything new about dark
energy yet,"

Guzzo is currently trying to convince the European Organisation for
Astronomical Research (ESO) to start a new survey of some 100,000
spectra at the same cosmic epoch, which would allow the team
to start discriminating between some dark-energy models."

So they found nothing and will get funding to get tighter yet into
their little corner.

The very familiar LIGO experiment pattern.

Quote:
"Dark energy is so weird that no single technique is capable of
elucidating its origin,"

After decades of very effectively milking the neutrino, they now
have a new grant cow to suck on. At least, this one can't
confuse anyone.

Quote
"In particular, having such complementary techniques will help
researchers disentangle the effects of dark energy from those
due to matter, which itself is mostly made up of an unknown
type of non-luminous or "dark" matter."

So now, even regular matter is made up of an "unknown type
of non-luminous or "dark" matter!

So back to the dark ages again to keep the the grant trough
overflowing. Don't you see the pattern Sam ?

Progress is slow but forward moving.

Surely you don't buy into this bit about normal matter being made
up of an unknown type of non-luminous or dard matter, do you.

André Michaud
.

Relevant Pages

  • Re: Anti-gravitational effects demonstrated using a Van De Graaf generator
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  • Re: Was Einsteins biggest blunder a stellar success? (Forwarded)
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  • Re: Dont like the truth? Lie.
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    (sci.space.policy)
  • Re: Plate Tectonics and Earth expansion
    ... the entire universe is expanding. ... Matter which doesn't attract, but repulses. ... A Quintessential Introduction to Dark Energy ...
    (sci.geo.geology)
  • Re: http://sciencenow.sciencemag.org/cgi/content/full/2008/801/3
    ... Astronomers have taken another significant step toward proving the existence of dark energy, the mysterious force that seems to be stretching the cosmos at an accelerating rate. ... They planned to do so by carefully calibrating the brightness of a well-studied type of supernova in very distant galaxies. ... But by 1998, the team had reached a stunningly different conclusion: The expansion of the universe was not slowing down--it was accelerating, driven by some unknown effect that came to be called dark energy. ... To conduct the new study, the Hawaiian team, led by astronomer Istvan Szapudi, combined two large-scale observations of the cosmos that already had been completed: the cosmic microwave background, which represents the last, dying embers of the big bang, and the Sloan Digital Sky Survey, which comprises images of millions of galaxies. ...
    (sci.physics)