A Tranquil Star

Good science is always poetry; some writers are just better at bringing it out than others. In this week’s New Yorker, Primo Levi (in a posthumously translated story) shows us how it’s done.

An observer who, to his misfortune, found himself on October 19th of 1950, at ten o’clock our time, on one of the silent planets of al-Ludra would have seen, “before his very eyes,” as they say, his gentle sun swell, not a little but “a lot,” and would not have been present at the spectacle for long. Within a quarter of an hour he would have been forced to seek useless shelter against the intolerable heat—and this we can affirm independently of any hypothesis concerning the size and shape of this observer, provided that he was constructed, like us, of molecules and atoms—and in half an hour his testimony, and that of all his fellow-beings, would end. Therefore, to conclude this account we must base it on other testimony, that of our earthly instruments, for which the event, in its intrinsic horror, happened in a “very” diluted form and, besides, was slowed down by the long journey through the realm of light that brought us the news. After an hour, the seas and ice (if there were any) of the no longer silent planet boiled up; after three, its rocks melted and its mountains crumbled into valleys in the form of lava. After ten hours, the entire planet was reduced to vapor, along with all the delicate and subtle works that the combined labor of chance and necessity, through innumerable trials and errors, had perhaps created there, and along with all the poets and wise men who had perhaps examined that sky, and had wondered what was the value of so many little lights, and had found no answer. That was the answer.

Some poetic license with the concept of simultaneity, but that’s okay. Read the whole thing. Hat tip to Bob Kirshner, who was the fact-checker’s fact checker. There’s an accompanying article about the translation.

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Unto Himself

The usual joke about the Vice-Presidency is that it doesn’t come with any real powers or responsibilities, beyond attending the occasional state funeral. Dick Cheney has long aimed to change all that. But Talking Points Memo has stumbled on evidence of a more far-reaching strategy than most of us had discerned. In the ultimate “take lemons and make lemonade” jujutsu move, Cheney has re-interpreted the Constitutional vagueness of the powers of his office as evidence that he is an entirely distinct branch of government. (Via Majikthise.) Those past couple hundred years, in which we thought there were only three branches of government in the United States? Just a bad dream.

You think this is some humorous exaggeration, but no. Something called the “Plum Book” is supposed to be a directory of all appointed government officials, but the Office of the Vice-President has declared that it doesn’t have to participate. Instead, it submitted this paragraph:

The Vice Presidency is a unique office that is neither a part of the executive branch nor a part of the legislative branch, but is attached by the Constitution to the latter. The Vice Presidency performs functions in both the legislative branch (see article I, section 3 of the Constitution) and in the executive branch (see article II, and amendments XII and XXV, of the Constitution, and section 106 of title 3 of the United States Code).

Perhaps it’s for the best. He wouldn’t be very good at attending funerals, that’s for sure.

Cheney in Parka

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arxiv Find: Cycling in the Throat

One of the reasons we (or I, anyway) don’t do more science posts is that it’s hard to do a good job. Cutting and pasting and linking is easy, whereas it takes time to really absorb some interesting scientific concept and present it in a hopefully-understandable way. And we’re all amateur blogging hobbyists with day jobs.

But I had the idea that it might be fun to get glimpses at what is going on in the field by taking occasional amusing papers that appear on arxiv.org, and just reposting their abstracts here with a couple of words. If anyone doesn’t follow the details, that’s okay; think of it as performance art, and the abstracts as little prose poems.

Today’s arxiv find is hep-th/0701252, “Cycling in the Throat” by Easson, Gregory, Tasinato and Zavala. Here’s the abstract:

We analyse the dynamics of a probe D3-(anti-)brane propagating in a warped string compactification, making use of the Dirac-Born-Infeld action approximation. We also examine the time dependent expansion of such moving branes from the “mirage cosmology” perspective, where cosmology is induced by the brane motion in the background spacetime. A range of physically interesting backgrounds are considered: AdS5, Klebanov-Tseytlin and Klebanov-Strassler. Our focus is on exploring what new phenomenology is obtained from giving the brane angular momentum in the extra dimensions. We find that in general, angular momentum creates a centrifugal barrier, causing bouncing cosmologies. More unexpected, and more interesting, is the existence of bound orbits, corresponding to cyclic universes.

See? Poetry. The basic idea here is to explore what can happen when a 3-brane (which could be our visible universe, if all of the particles of the Standard Model were confined to it) doesn’t just sit there in the extra dimensions, but zooms and twirls around like a multidimensional figure skater. Ever since Randall and Sundrum caught on to the fun things that can happen when extra dimensions are “warped,” we continue to discover new and interesting scenarios for these hypothetical directions of space. This paper sets the branes to spinning, and steps back to look at the results, which apparently include bouncing cosmologies. I might worry about stability in the presence of perturbations, but that’s just something to do for a follow-up paper — we’ll never run out of good questions to ask.

Some other fun papers this week:

  • Jackiw and Pi, “Chiral Gauge Theory for Graphene,” cond-mat/0701760.
  • Bekenstein, “The modified Newtonian dynamics-MOND-and its implications for new physics,” astro-ph/0701848.
  • Bojowald, “Quantum gravity and cosmological observations,” gr-qc/0701142.
  • Brandenberger, “String Gas Cosmology and Structure Formation – A Brief Review,” hep-th/0702001.

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Sponsored Links

One of the fun aspects of using Gmail is the little ads for sponsored links that appear next to every message. I can’t imagine ever clicking on one of them, but it’s amusing to see what the Google mind thinks is related to the message content. For the most recent daily mailing from gr-qc@arxiv.org, here were the sponsored links that came along with it:

Fields Medal declined
Grigori Perelman has declined the 2006 Fields Medal for mathematics
www.thefirstpost.co.uk

the field center
how consciousness creates reality; an extraordinary eight-week course.
www.fieldcenter.org

The Theory of Everything
String theory can’t be all there is Read all about the alternatives
NewPhysicsAndTheMind.net

field offices ny
Perfect sales office space in NYC. $495+, full service. Start now!
www.microoffice.us

Relativity Challenge
Did Einstein make a math mistake? You be the judge!
www.relativitychallenge.com

Wanted: Scientists
Jobs for PhDs in biology, chemistry physics, math, and engineering
jobs.phds.org

Humidifier Filters
All sizes all the time 24 hour shipping
www.filters-now.com

So the scorecard is: two relevant links, three crackpot sites, one hilariously inappropriate understanding of the word “field,” and one perplexing sales pitch for humidifiers. But I kind of like the idea of attacking string theory via Google ads. I might just start advertising my own papers this way.

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King Me

I love science, because the universe has very little tolerance for wishful thinking. You can believe whatever kind of nonsense you like about how the world works, but eventually the data will come along and slap you upside the head. Sadly, not everyone lets the sting of reality affect their prejudices, but that’s another story.

Here’s a fact: among chess grandmasters, there are a lot more men than women. Chess is great, because it’s pretty much a meritocracy, not an old-boys network (colorful parables notwithstanding). There is a simple old-fashioned sexist explanation for this phenomenon, which is that women just aren’t as good at chess as men are. Back in the veldt, you see, when the men were celebrating a successful hunt by playing chess with sticks in the dirt, the women were busy washing the dishes, so there was no evolutionary pressure for them to develop those skills. These days, however, there is a more sophisticated new-fangled sexist explanation for these kinds of discrepancies, which invokes bell curves. It’s not, so the story goes, that the average woman isn’t just as good as the average man, it’s just that their standard deviations are different, so there is underrepresentation at the high end. This hypothesis suffers under the weight of making all sorts of predictions that aren’t true, but it’s kind of scientific-sounding, so it’s gained a measure of popularity in certain circles.

So now someone has looked in detail at the situation in chess. Jake Young at Pure Pedantry points to a study by Chabris and Glickman, “Sex Differences in Intellectual Performance: Analysis of a Large Cohort of Competitive Chess Players.” I noticed the link at Marginal Revolution, and I agree with Tyler Cowen about the most striking findings:

They found no greater variance in men than women. It had been suggested that since science selects for individuals at the upper tail of the distribution, a higher variance in men than women might explain their greater representation. However, the researchers found that — with respect to chess — if anything in most age groups women had a higher variance then men. Upper tail effects do not explain the differences in the numbers of grandmasters…

And:

If you look at the participation rate of women and relate that to performance, you find that in cases where the participation rate of women and men is equal the disparity in ability vanishes. Basically, this means that in zip codes where there are equal numbers of men and women players there is no great disparity between male and female ability — and certainly not a disparity in ability large enough to explain the difference in the numbers of grandmasters.

How about that? It’s not any differences in innate ability, it’s just that women are “choosing” not to play competitive chess. Choosing is put in scare quotes because there’s obviously going to be a great deal of influence from parents encouraging/discouraging their kids at a very young age, but whatever. It’s a shame if young girls who would have been enthusiastic about chess are pushed away by social pressures of one form or another, but for most people chess is not a central part of their lives.

It’s a much bigger deal when women (or whomever) are enthusiastic about choosing something as a career, and are pushed away by an impressive battery of systematic biases. Which is what is clearly going on in science, especially in physics. If girls are given just as much encouragement and opportunity as boys are, and nevertheless choose to become truck drivers or gourmet chefs rather than scientists, that’s fine with me — the goal has never been equal representation of the genders, it’s equal chances for everyone to do what they find interesting. But we have a long way to go before we get there.

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Tweaks

Our crack team of blog experts has finally identified the problem that was causing the alignment problems in the latest version of Internet Explorer. So if you’ve stopped reading the blog because it didn’t look right, you can come back now! Of course, since you’re not reading this, you’ll never know.

We’ve also taken steps to decrease the number of “CPU allocation exceeded” errors, and to prevent people with blogspot.com domains to comment without being labeled as spam. But there are still some issues there — especially if you can’t comment, please do let us know.

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I Always Thought Martin Sheen Was a Bit Two-Dimensional

From Angela Gunn comes news of Flatland: the Movie. And also, unconnectedly, Flatland: the Film. So, two different animated versions of Edwin A. Abbott’s classic “Romance of Many Dimensions” available for your DVD player. The Movie has the bonus that Martin Sheen is voicing the protagonist, but the Film has the advantage that it’s already available.

the Movie

Flatland the Film

Of course, as Angela points out, you could just read the original. It’s a favorite among physicists, especially those who work on extra dimensions. What they never seem to remember is how the book ends — protagonist A. Square, who has claimed to have proof that extra dimensions exist, is imprisoned for life on charges of heresy. Hmmm.

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Theology and the Real World

Yesterday was Blog for Choice day. I didn’t get to participate, as I spent the whole day in meetings and airplanes. I had no choice! But at the end of the day, checking up on Bloglines from a hotel in Tucson, I found moving posts from Bitch Ph.D., Shakespeare’s Sister, Litbrit, and Lizardbreath from Unfogged, among numerous others.

Blog for Choice Day

Conventional wisdom among liberals and feminists is that being anti-abortion has little to do with a desire to protect helpless little blastocysts, and is really about denying women control over their bodies and lives. I always had trouble believing this, as I went to a nice Catholic school in which joining the “For Life” group was just as respectable a public-service move as joining Amnesty International. My friends at Villanova (including a large number of women) really, honestly, and in good faith did believe that fetuses were people with souls, and they needed to be protected. This didn’t quite amount to a well-thought-out and consistent philosophical position, admittedly; you’ll find very few such people who really want to punish abortionists just like we punish murderers, or who would save a petri dish of fertilized eggs from a burning building before saving a breathing baby, or who believe that heaven is filled with the souls of embyos that failed to implant in the uterus. But they really were just trying to do the right thing, according to social justice as they understood it. And they weren’t necessarily overly dogmatic about it; I helped organize a panel discussion on abortion that featured priests, biologists, and philosophers, which ended up being quite interesting (although it somehow failed to solve the world’s problems).

Ultimately, free of my protective collegiate cocoon, I realized that the conventional wisdom among liberals and feminists is completely correct! Although some people have anti-abortion feelings for straightforwardly moral reasons, for many more people (especially the most vocal), it really is about denying women their own agency. Curse those liberals and feminists, right again!

But I still remember my friends who were not like that, and I recognize that for many people abortion really is a clash of absolutes. You can say all you want that it’s the pregnant woman’s body, hands off, etc.; but if it were actually true that a fetus was a person with a soul who was entitled to all of the protections that any post-birth person was entitled to, none of that would matter. The heart of the matter is: people who believe that are wrong.

Which is why my favorite blog-for-choice post was Lindsay’s. She puts it pretty straightforwardly:

To me, it’s just obvious that fetuses aren’t people and that real-live people who have become hosts to unwanted pre-people should be able to take the necessary steps not to become the parents of actual people. Who the hell gave anyone the idea that this choice is a view that needs defending, as opposed to common sense? I don’t write posts explaining that you shouldn’t torture your dog, or steal from your employer. Shouldn’t it be obvious that you shouldn’t consign an innocent person to incubate a hunk of protoplasm until it becomes a baby?

It does seem pretty obvious, unless you really think that hunk of protoplasm is a person with all of the rights of any of the other people you meet on the street every day. Which, when you think about it, isn’t obvious at all. The only reason anyone thinks it’s true is because their definition of a “person” is completely divorced from common sense, and is instead informed by a supernatural notion of personhood in which a soul enters that single cell at the moment of conception. A notion that would seem completely absurd if it weren’t for religion.

Steven Weinberg famously said, “Good people will do good things, and bad people will do bad things. But for good people to do bad things — that takes religion.” This is a little bit harsh, of course, and I’d rather not get into the tiresome argument over whether the net effect of religious belief is to make people do more good things than bad things. But when squishy-liberal religious people ask why atheists bother making noisy public proclamations against their supernatural beliefs, it’s worth pointing out that such beliefs often do have consequences in the real world.

The idea that religion is the sole source of morality is silly — morality is invented by human beings, who are trying to negotiate their conflicting and incompatible desires in a world that doesn’t always play fair. The reason why it’s important to make the case that religious beliefs are false, even if adherents can point to examples where those false beliefs led people to be nice to each other and do other good things, is that false beliefs can just as easily lead people to treat each other badly. Given untrue hypotheses, it’s trivial to reach all sorts of untrue conclusions. Abortion is the perfect example. My friends back in college, with all of the good intentions in the world, would happily condemn a young and unprepared woman to an unwanted eighteen-year commitment, all because of their own misguided beliefs about nature and the supernatural. If we really want to make the world a better place, telling the truth about how it works is a good place to start.

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Friday Song Lyric: Nick Cave

Amara reminds me that we haven’t had any poetry here for a while. Don’t have a good stand-alone poem on hand, but I’ve always had a soft spot for these lyrics from Nick Cave’s The Boatman’s Call album.

Into My Arms

I don’t believe in an interventionist God
But I know, darling, that you do
But if I did I would kneel down and ask Him
Not to intervene when it came to you
Not to touch a hair on your head
To leave you as you are
And if He felt He had to direct you
Then direct you into my arms

Into my arms, O Lord
Into my arms, O Lord
Into my arms, O Lord
Into my arms

And I don’t believe in the existence of angels
But looking at you I wonder if that’s true
But if I did I would summon them together
And ask them to watch over you
To each burn a candle for you
To make bright and clear your path
And to walk, like Christ, in grace and love
And guide you into my arms

Into my arms, O Lord
Into my arms, O Lord
Into my arms, O Lord
Into my arms

But I believe in Love
And I know that you do too
And I believe in some kind of path
That we can walk down, me and you
So keep your candles burning
And make a journey bright and pure
That you’ll keep returning
Always and evermore

Into my arms, O Lord
Into my arms, O Lord
Into my arms, O Lord
Into my arms

See the video on YouTube for full effect.

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