December 2012 archive

This is your morning Open Thread. Pour your favorite beverage and review the past and comment on the future.

Find the past “On This Day in History” here.

December 1 is the 335th day of the year (336th in leap years) in the Gregorian calendar. There are 30 days remaining until the end of the year

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On this day in 1990, the Chunnel makes breakthrough. Shortly after 11 a.m. on December 1, 1990, 132 feet below the English Channel, workers drill an opening the size of a car through a wall of rock. This was no ordinary hole–it connected the two ends of an underwater tunnel linking Great Britain with the European mainland for the first time in more than 8,000 years.

The Channel Tunnel, or “Chunnel,” was not a new idea. It had been suggested to Napoleon Bonaparte, in fact, as early as 1802. It wasn’t until the late 20th century, though, that the necessary technology was developed. In 1986, Britain and France signed a treaty authorizing the construction of a tunnel running between Folkestone, England, and Calais, France.

The Channel Tunnel (French: Le tunnel sous la Manche), (also informally known as the Chunnel) is a 50.5-kilometre (31.4 mi) undersea rail tunnel linking Folkestone, Kent near Dover in the United Kingdom with Coquelles, Pas-de-Calais near Calais in northern France beneath the English Channel at the Strait of Dover. At its lowest point, it is 75 metres (250 ft) deep. At 37.9 kilometres (23.5 mi), the Channel Tunnel possesses the second longest undersea portion of any tunnel in the world. The Seikan Tunnel in Japan is both longer overall at 53.85 kilometres (33.46 mi), and deeper at 240 metres (790 ft) below sea level.

The tunnel carries high-speed Eurostar passenger trains, Eurotunnel Shuttle roll-on/roll-off vehicle transport-the largest in the world-and international rail freight trains. The tunnel connects end-to-end with the LGV Nord and High Speed 1 high-speed railway lines. In 1996 the American Society of Civil Engineers identified the tunnel as one of the Seven Wonders of the Modern World.

Ideas for a cross-Channel fixed link appeared as early as 1802, but British political and press pressure over compromised national security stalled attempts to construct a tunnel. However, the eventual successful project, organised by Eurotunnel, began construction in 1988 and opened in 1994. The project came in 80% over its predicted budget. Since its construction, the tunnel has faced several problems. Fires have disrupted operation of the tunnel. Illegal immigrants and asylum seekers have attempted to use the tunnel to enter Britain, causing a minor diplomatic disagreement over the siting of the Sangatte refugee camp, which was eventually closed in 2002.

You know, I do have other interests.

My comment at the moment was-

Fields have different expressions depending on how you interact with them.

Nothing so hard about that.

But the Standard Model is only as useful as Newtonian Mechanics.  Good for some things, not so much for others.

This is the kind of pithy insight that has some of my acquaintance begging me to get a crack habit twitter account.

Well, I have one and a few blogs that I frequent which leads me to gratefully accept affirmations of sanity.

Supersymmetry Fails Test, Forcing Physics to Seek New Ideas

By Natalie Wolchover, Scientific American

November 29, 2012

As a young theorist in Moscow in 1982, Mikhail Shifman became enthralled with an elegant new theory called supersymmetry that attempted to incorporate the known elementary particles into a more complete inventory of the universe.

“My papers from that time really radiate enthusiasm,” said Shifman, now a 63-year-old professor at the University of Minnesota. Over the decades, he and thousands of other physicists developed the supersymmetry hypothesis, confident that experiments would confirm it. “But nature apparently doesn’t want it,” he said. “At least not in its original simple form.”

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“Supersymmetry is such a beautiful structure, and in physics, we allow that kind of beauty and aesthetic quality to guide where we think the truth may be,” said Brian Greene, a theoretical physicist at Columbia University.

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“I think it is a mistake to focus on popular versions of supersymmetry,” said Matt Strassler, a particle physicist at Rutgers University. “Popularity contests are not reliable measures of truth.”