Physicist
Lee Smolin has a new book entitled Einstein's
Unfinished Revolution: The Search for What Lies Beyond the Quantum.
In the book, Smolin sells
himself as a realist. Contrary to many scientists, he claims that
quantum mechanics does not require any radical revision of
old-fashioned ideas about the relation between the physical world and
the observer. In the preface, he states, “Commonsense realism, according to which science can aspire to give a complete picture of the natural world
as it is, or would be in our absence, is not actually threatened by
anything we know about quantum mechanics.”
His
case for this claim is not terribly convincing. He discusses some
theories that supposedly allow us to keep quantum mechanics and maintain such a “commonsense realism.” But he's frank in
discussing problems, shortcomings and drawbacks of such theories, so
frank that we're not left thinking that any one of these theories is very
likely to be true.
In
the preface Smolin refers rather scornfully to the idea of the
multiverse, that our universe is only one of many universes. He
states the following:
“A
vocal minority of cosmologists proclaims that the universe we see
around us is only a bubble in a vast ocean called the multiverse that
contains an infinity of other bubbles....The fact that all, or almost
all, of the other bubbles are forever out of range of our
observations, means the multiverse hypothesis can never be tested or
falsified. This puts this fantasy outside the bounds of science.”
That
sounds very down-to-earth, and fits in with Smolin's positioning of
himself in the book as a realist. But what is strange is that Smolin
himself was for many years a champion of a multiverse theory that he
had created. He
called the theory “cosmological natural selection,” and advanced
it in a book called The
Life of the Cosmos.
In
his book Time
Reborn,
Smolin describes the theory as follows:
“The
basic hypothesis of cosmological natural selection is that universes
reproduce by the creation of new universes inside black holes. Our
universe is thus a descendant of another universe, born in one of its
black holes, and every black hole in our universe is the seed of a
new universe. This is a scenario within which we can apply the
principles of natural selection.”
I
discuss this theory and some reasons for doubting it in this post.
Smolin
claimed that one advantage of his theory of cosmological natural
selection is that it makes a falsifiable prediction. In a 2004 paper
(page 38) he lists one such prediction:
“There
is at least one example of a falsifiable theory satisfying these
conditions, which is cosmological natural selection. Among the
properties W that make the theory falsifiable is that the upper mass
limit of neutron stars is less than 1.6 solar masses. This and other
predictions of CNS have yet to be falsified, but they could easily be
by observations in progress.”
But
by now this prediction has proven to be incorrect. In September 2019
a science news story reported on observations of the most massive
neutron star ever found. We are told, “The researchers, members
of the NANOGrav Physics Frontiers Center, discovered that a rapidly
rotating millisecond pulsar, called J0740+6620, is the most massive
neutron star ever measured, packing 2.17 times the mass of our Sun
into a sphere only 30 kilometers across.”
So
Smolin told us that the cosmological natural selection theory would
be falsified if neutron stars were found to be more massive than 1.6
solar masses, and by now it has been found that a neutron star has
2.17 solar masses. I guess we can consider the cosmological natural
selection theory to be falsified.
Art depicting a neutron star (Credit: NASA'S Goddard Space Flight Center)
Judging
from his latest book, Smolin may have kind of deep-sixed or lost interest in his main
theoretical offspring, the theory of cosmological natural selection.
Such a theory was a multiverse theory, but now in the passage I
quoted Smolin dismisses multiverse theories as “fantasy.” The
index of Smolin's new book makes no mention of the theory of
cosmological natural selection, and I can't recall him mentioning it in the book. The book jacket lists other books
Smolin has written (including his excellent book The
Trouble with Physics),
but makes no mention of his opus The
Life of the Cosmos
selling us the theory of cosmological natural selection.
Smolin's
latest book book is very thoughtful, readable and well-written, explaining some abstruse topics (such as pilot-wave theory) more clearly than
I have ever read them expounded. Smolin denounces the Everett
“many-worlds” theory, stating on page 172, “The Everett
hypothesis, if successful, would explain vastly too much, and also much too little.”
The
Everett many-worlds theory is the groundless nonsensical notion that
reality is constantly splitting up into different copies of itself,
so that there are an infinity of parallel universes. On page 178 of
the book, Smolin perceives the ruinous moral implications of such a
theory. Using the term “somewhere else in the wave function” to
refer to imagined parallel universes, he notes, “If every
eventuality we worked to eliminate, whether starvation, disease or
tyranny, was actual somewhere else in the wave function, then our
efforts would not result in an overall improvement.” Smolin
states the following:
“If
no matter what choices I make in life, there will be a version of me
that will take the opposite choice, then why does it matter what I
choose? There will be a branch in the multiverse for every option I
might have chosen. There are branches in which I become as evil as
Stalin and Hitler and there are branches where I am loved as a
successor to Gandhi. I might as well be selfish and make the choices
that benefit me....This seems to me to be an ethical problem because simply
believing in the existence of all those copies lessens my sense of
moral responsibility.”
I
had made a very similar comment prior to Smolin's 2019 book. In a
post published on April 8, 2018 I called the Everett many-worlds
theory an evil doctrine because of its morality-killing tendencies. I
stated the following:
“Why
is the Everett 'many worlds' theory an evil doctrine? It is because
if a person seriously believed such a doctrine, such a belief would
tend to undermine any moral inclinations he had. I will give a
concrete example. Imagine you are driving in your car at 2:00 AM on a
bitterly cold snowy night, and you see a scantily clad very young
child walking alone far from anyone. If you don't believe in the
Everett 'many worlds' theory, you may stop your car and call the
police to alert them of this situation, or do something like give
your warm coat to the child to keep her warm. But if you believe in
the Everett “many worlds” theory, you may reason like this:
regardless
of what I do, there will be an infinite number of parallel universes
in which the child freezes to death, and an infinite number of other
parallel universes in which the child does not freeze to death; so
there's really no point in doing anything.
So
you may then drive on without stopping or doing anything, convinced
that the multiverse would still be the same no matter how you acted.”
Being
infinitely extravagant and completely groundless, as well as morally
disastrous, the Everett “many worlds” theory of an infinity of
parallel universes (and infinite copies of yourself) is best described as “evil nonsense.” I am
pleased to find that I am not the only who recognizes how morally
ruinous such speculation is.
No comments:
Post a Comment