Computers and Many Worlds

I commented on this New Yorker article:

Deutsch believes that if a quantum computer were built it would constitute near-irrefutable evidence of what is known as the Many Worlds Interpretation of Quantum Mechanics. A number of respected thinkers in physics besides Deutsch support the Many Worlds Interpretation, though they are a minority, and primarily educated in England, where the intense interest in quantum computing has at times been termed the Oxford flu. But the infection of Deutsch’s thinking has mutated and gone pandemic. Other scientists, although generally indifferent to the truth or falsehood of Many Worlds as a description of the universe, are now working to build these dreamed-up quantum computing machines.

They are indifferent to the concept because it is a meaningless fantasy.

Computer scientist Scott Aaronson writes:

However, reading this article also depressed me, as it dawned on me that the entire thing could have been written fifteen years ago, with only minor changes to the parts about experiment and zero change to the theoretical parts.  I thought: “has there really been that little progress in quantum computing theory the past decade and a half —- at least progress that a New Yorker reader would care about?” ... A good analogy would be an article about the Web, published today, that described the strange and exciting new world of Netscape, HotBot, and AltaVista.

There may never be any such progress. The whole subject has been greatly oversold.

Einstein was Jewish

Wikipedia is having a debate on whether the Albert Einstein page should prominently identify him as Jewish. An editor says that his ethnicity is not notable.

I think that Einstein's Jewishness is a significant part of his notability. His parents were Jewish. He strongly identified with being a Jew throughout his adult life. He is mainly famous for being a physicist, but he is also frequently quoted for his opinions on God, religion, and peace. He was an active Zionist and a Nazi refugee. He is especially popular among Jews. As another editor says:

He described his 1923 visit to Palestine, where he was mobbed by Jewish throngs as "the greatest day of my life". He was on the first Board of Governors of Hebrew University of Jerusalem.

He left his assets to Hebrew U. People are fascinated with the details of Einstein's life, and his Jewishness is one of the first things they learn. Saying he was Jewish is as important as saying that he was German-born.

The strongest counter-argument is that the Martin Luther King, Jr. page does not say that he was black. I think that is a little strange. My guess is that King's fans are trying to make some sort of point by ignoring the color of his skin, since King was famous for opposing racial discrimination. But I am not sure what the point would be to ignoring Einstein's Jewishness.

Kuhnian nature of dark matter and energy

This comment was just posted on Wikipedia:

Role of Dark Matter/Energy in the Kuhnian development of physics

My strong sense is that dark matter/energy are a reification of fundamental problems in modern physics, i.e. gravity + the Standard Model. As I've put on Higgs Boson and it's never been challenged, dark matter/energy is not (except as a metonym for the observed discrepancy between that theory and observation) a part of any accepted (or FTM, SFAIK proposed) theory of physics, although there are various conjectures and speculations which fall short of same. This aspect doesn't seem to be fully enough developed in the article as it stands now nor do I see commentary in the talk archives about same but may have missed something. Lycurgus (talk) 16:08, 6 May 2011 (UTC)

This is nonsense, of course. I will be interested to see if the point makes it into the main article.

Dark matter is not some Kuhnian untestable idea. There is an active search for a dark matter particle, and a hot dispute over whether a 7-8 GeV dark matter particle has already been discovered.

Frame dragging confirmed

Today's science news is that Einstein was right:

Four superconducting ping-pong balls floating in space have just confirmed two key predictions of Einstein’s general relativity, physicists announced in a press conference May 4.

“We have completed this landmark experiment testing Einstein’s universe, and Einstein survives,” said physicist Francis Everitt of Stanford University, the principal investigator on NASA’s Gravity Probe B mission.

The probe, which launched in 2004, was designed to test the effect Earth’s gravity has on the space-time around it. According to Einstein, the Earth warps its local space-time like a bowling ball sitting on a trampoline, a phenomenon called the geodetic effect. This effect means that a circle of fabric with the Earth’s circumference, about 24,900 miles, would be pulled into a shallow cone with a circumference 1.1 inches shorter.

The Earth also swirls the nearby space-time around with it as it rotates, like water spiraling around a drain, in an effect called frame-dragging.

An amazing amount of work went into this experiment. There was a lot of serious doubt as to whether it would produce any measurable results. Apparently there is still some dispute about how precisely the theory has been confirmed. The satellite stopped functioning in 2005, and NASA shut the team down in 2008. So how is it that they suddenly have some results, in 2011? It sounds like a desperately attempt to justify their funding by reinterpreting some old data.

Einstein did not have much to do with this. He did not write any papers on frame-dragging, as far as I know. He did write a lot of papers on relativity, and frame-dragging uses relativity, but not the relativity that he contributed.

Gravity Probe B is one of the longest-running NASA projects ever. It started in 1963, ...

Physicist Clifford Will of Washington University in St. Louis, head of the external review board for Gravity Probe B, called the research team’s efforts “heroic” and stressed the importance of testing fundamental theories of nature, not just taking them for granted.

“It is popular lore that Einstein was right, but no such book is ever completely closed in science,” he said. “While the result in this case does support Einstein, it didn’t have
to.”

Will is a big Einstein idolizer.

Dennis Overbye at the NY Times explains:

Einstein’s theory relates gravity to the sagging of cosmic geometry under the influence of matter and energy, the way a sleeper makes a mattress sag. One consequence is that a massive spinning object like Earth should spin up the empty space around it, the way twirling the straw in a Frappuccino sets the drink and the whole Venti-size cup spinning around with it, an effect called frame dragging. Astronomers think this effect, although minuscule for Earth, could play a role in the black hole dynamos that power quasars.

Overbye is another Einstein idolizer. He wrote a whole biography of Einstein.

Geocentric universe

Here is a medieval geocentric view of the universe.

The caption says:

Figure of the heavenly bodies - Illuminated illustration of the Ptolemaic geocentric conception of the Universe by Portuguese cosmographer and cartographer Bartolomeu Velho (?-1568). From his work Cosmographia, made in France, 1568 (Bibilotèque nationale de France, Paris). Notice the distances of the bodies to the centre of the Earth (left) and the times of revolution, in years (right).

and

The Ptolemaic geocentric model of the Universe according to the Portuguese cosmographer and cartographer Bartolomeu Velho (Bibliothèque Nationale de France, Paris).

I would not call it a "Ptolemaic geocentric conception" or "model". Ptolemy's Almagest is the great book on this subject, and it had many diagrams, but none like this. The model does not use concentric orbs around the Earth, as shown. It does not predict distances from the Earth at all.

100 greatest ideas

Time magazine has a special issue on Time 100 Ideas That Changed the World (History's Greatest Breakthroughs, Inventions and Theories). Einstein's Theory of Relativity leads the pack, of course, followed by Computing, The Big Bang, and (Christian) Monotheism.

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