"It's not that I'm so smart," Einstein once said,
"It's just that I stay with problems longer."
Even Einstein Had His Off Days
January 2, 2005
By SIMON SINGH
London
WE have now entered what is being celebrated as the
Einstein Year, marking the centenary of the physicist's
annus mirabilis in 1905, when he published three landmark
papers - those that proved the existence of the atom,
showed the validity of quantum physics and, of course,
introduced the world to his theory of special relativity.
Not bad for a beginner.
"It's not that I'm so smart," Einstein once said, "It's
just that I stay with problems longer." Whatever the reason
for his greatness, there is no doubt that this
determination allowed him to invent courageous new physics
and explore realms that nobody else had dared to
investigate.
What he was not, however, was a perfect genius. In fact,
when it came to the biggest scientific issue of all - the
origin of the universe - he was utterly wrong. And while we
should certainly laud his achievements over the next 12
months, we may learn a more valuable lesson by
investigating Einstein's greatest failure.
The story starts in the late 19th century, when the
scientific establishment believed in an eternal and
unchanging universe. This was a neat theory of cosmology,
because a universe that had always existed did not raise
any awkward questions, such as "When was the universe
created?" and "What (or Who) created it?"
Einstein grew up in this era, and was similarly convinced
that the universe had existed for an eternity. However,
when he developed general relativity (his theory of
gravity) in 1915, he became aware of a tricky problem.
Gravity is an attractive force - it attracts coins to the
ground and it attracts comets toward the sun. So why hadn't
gravity caused the matter in the universe to collapse
inward on itself?
Gravity seemed to be incompatible with an eternal,
unchanging universe, and Einstein certainly had no sympathy
for the alternative view of a collapsing universe, stating
that: "To admit such a possibility seems senseless."
Isaac Newton had run into the same problem with his own
theory of gravity some 250 years earlier. He too believed
in an eternal universe, yet he knew that gravity would have
to cause its collapse after a finite time. His solution was
to propose that God was responsible for keeping apart all
the celestial objects, adjusting their positions from time
to time as part of his cosmic curatorial responsibilities.
Einstein was reluctant to invoke God, so his solution was
to fiddle with his theory of general relativity, adding an
antigravity force alongside familiar gravity. This
repulsive force would counteract gravity over cosmic
distances, thereby maintaining the overall stability of the
universe. There was no evidence for this antigravity force,
but Einstein assumed that it had to exist in order to
provide a platform for eternity.
Although everything now seemed to make sense, there were
some dissenters. A small band of renegade cosmologists
suggested in the 1920's that the universe was not eternal
but had been created at a finite moment in the past. They
claimed it had exploded and expanded from a small, hot,
dense state into what we see today. In particular, they
argued that it had once been compacted into a primeval
super atom, which had then ruptured and exploded. This
model, which has since developed into the Big Bang theory,
did not require any stabilizing antigravity because it
proposed a dynamic, evolving universe.
The Big Bang model was initially ridiculed by the
scientific establishment. For example, one of its pioneers,
Georges Lemaître, was both a cosmologist and an ordained
priest, so critics cited his theology as his motivation for
advancing such a crackpot theory of creation. They
suspected that the model was Lemaître's way of sneaking a
Creator into science. While Einstein was not biased against
Lemaître's religious background, he did call the priest's
physics "abominable." It was enough to banish the Big Bang
model to the hinterlands of cosmology.
However, in 1929 Einstein was forced to eat humble pie.
Edwin Hubble, working at Mount Wilson Observatory in
Southern California, showed that all the distant galaxies
in the universe were racing away from one another as though
they were debris from a cosmic explosion. The Big Bang
model seemed to be correct. And, while it would take
several decades before the theory was accepted by the
scientific establishment, Einstein, to his credit, did not
fight on. "This is the most beautiful and satisfactory
explanation of creation to which I have ever listened," he
said, and even called his repulsive force the biggest
blunder of his career.
In 1931, Einstein paid a visit to Hubble at Mount Wilson,
where he renounced his own static cosmology and endorsed
the expanding universe model. His support was enough for
The New York Times to embrace the mavericks, running an
article with the headline "Lemaître Suggests One, Single,
Great Atom, Embracing All Energy, Started The Universe."
Hubble's hometown newspaper in Missouri, The Springfield
Daily News, preferred to focus on its local hero: "Youth
Who Left Ozark Mountains to Study Stars Causes Einstein to
Change His Mind."
It might seem that Einstein emerges from this story as a
flawed genius, one who was not perfect. In fact, there is a
twist to the tale, one that implies he was perhaps better
than perfect.
If gravity pulls everything together, then the expansion of
the Big Bang should be slowing, because all the receding
galaxies would be attracted to one another. In 1998,
however, when astronomers tried to measure this
deceleration, they were astonished to find that the
universe is in fact accelerating. The galaxies are
apparently moving apart faster and faster as time passes.
What is the best explanation scientists can come up with?
The existence of an antigravity force. Theorists call this
repulsive effect "dark energy," but it is exactly the sort
of force that Einstein posited to maintain the stability of
the universe. Antigravity is now back in fashion some seven
decades after he abandoned it. It seems that even when
Einstein thought he was wrong, he turned out to be right.
And, as we celebrate the Einstein Year, let's also bear in
mind the fact that he was prepared to admit that he was
wrong. Perhaps humility, more than anything, is the mark of
true genius.
Simon Singh is the author of "Fermat's Enigma" and the
forthcoming "Big Bang: The Origins of the Universe."
http://www.nytimes.com/2005/01/02/opinion/02singh.html?ex=1105676520&ei=1&en=0b7aacf6240caaf3
Copyright 2004 The New York Times Company