This just got sent out to the physics department mailing list…

Well, no turning back now…

PhD Thesis Defense

Candidate:  Yonatan Zunger
Advisor:  Leonard Susskind

Tuesday, May 20, 9 AM
Varian 3rd Floor Conference Room

TITLE:
Building Branes Out of Matrices

ABSTRACT:
We examine the set of objects which can be built in type IIA string theory by
matrix methods using an infinite number of D0-branes. In addition to
stacks of ordinary Dp-branes and branes in background fields, we find
exotic states which cannot be constructed by other means. These states
exhibit strongly noncommutative geometry, (e.g., partial derivatives on them
do not commute) and some are conjectured to have Z_N–valued
charges similar to those of the type I D-instanton. Real-valued charges are
forbidden by Dirac quantization, leading to a nontrivial relationship
between noncommutative topological invariants.

Published in: on May 14, 2003 at 14:57  Comments (12)  
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Beta software up

For those of you who had some interest in the OS X clipboard software: It’s now available for download here. No fancy web page yet; I’ll make one of those when I have time. Play with it, use it, LMK if you find any bugs or missing features. I’m especially interested in improving its ability to “guess” data formats correctly – if you find a case where it guesses wrong, or it does something else suboptimal, please let me know.

Published in: on May 13, 2003 at 13:39  Comments Off on Beta software up  
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Guinea pigs wanted

For those of you who use OS X and the terminal pretty regularly: I’ve got a program that meshes the terminal in with the clipboard (providing copy and paste to files, URL’s and pipes) which is ready for beta. If any of y’all are interested, comment here or drop me an e-mail.

Published in: on May 12, 2003 at 16:11  Comments (4)  
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Too much coding…

I did some OS X coding last night. The docs for some of the API’s in OS X include a lot of phrases like “The NSString class is ‘toll-free bridged’ to the Core Foundation Kit’s CFString class…”

Sometime late last night, that morphed in my mind into ‘troll-free bridged.’ This led to the thought of an NSTroll class, an NSTrollBridge, and so on.

I’ll just say that too much coding leads to very weird dreams.

Published in: on May 12, 2003 at 10:21  Comments Off on Too much coding…  
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Work avoidance behavior

Just finished the latest rev of the terminal clipboard utility for OS X. It now can read inputs from files and URL’s, and correctly handle text, raw data, and images. Further formats (PDF, EPS, …) to be added later. It’s starting to be pretty useful, although there’s still a minor annoyance: If your data is anything other than text or raw bits, you have to explicitly tell it so. (If you don’t and copy an image, then paste it elsewhere, it’ll paste the bits of the image as text rather than an image… this has to do with some aspects of the way OS X clipboards work. Need to play with it more to teach it to identify data types.)

If anyone feels like beta-testing it, let me know. It’s handy if you use the terminal a lot.

Update: And thanks to a random inspiration, it now can try to guess what kind of data something is, although it’s a bit slower that way. OK, this is now really in the realm of work avoidance.

Fortunately, I also got some productive work done today, like writing the outline for my oral defense…

Published in: on May 11, 2003 at 22:59  Comments Off on Work avoidance behavior  
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Because I’m avoiding work…

Looking up “draught” in the OED for pronounciation notes, which can’t be copied into here because it’s full of symbols that ordinary HTML can’t render. Apparently the pronounciation “drawt” showed up in late Middle English but went out around the 18th century; the Scots currently pronounce it “dracht” (guttural ch, as in ‘loch’) and everyone else has gone over to “draft,” a pronounciation which the OED editors apparently don’t like because it makes the connection with “draw” less obvious. (A draught is something which is drawn, as a breath, a drink, a pen across a page, or an animal’s load)

The more logical spelling “draft” is therefore coming into use, but is apparently the accepted spelling only for certain senses of the word, e.g. a drafting table, or a gust of wind in a room, and not e.g. a draught of beer or a draught animal.

This has been another useless fact.

Published in: on May 9, 2003 at 11:28  Comments (6)  
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What the…?

You know, this may well turn out to be a dud, or a complete error, but it looks like the Bush administration may have actually come up with a foreign policy initiative for the Middle East that’s a good idea. (Yes, I’ve gotten rather cynical about these things. Does it show?)

If it goes off, OT1H it’s probably a big win for Bush and some of his cronies, but it’s also potentially a win for quite a few other people as well, and it may actually advance peace in the Middle East. And since the cynical advantage part is pretty obvious, it doesn’t make me worry about hidden booby-traps quite as much.

But you know… this sort of policy, of keeping everyone’s hands so far in one another’s pockets that they can’t reach for a gun does sound vaguely like the Clinton doctrine… *grin*

Story here.

And in other politics news…

Published in: on May 9, 2003 at 00:40  Comments Off on What the…?  
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OS X is da shit.

So hansandersen and I were drinking coffee, and we got an idea for an OS X program. Since then we’ve written and debugged it, and by tomorrow PM we should have a distro ready. It provides command-line access to the clipboard: you can copy and paste, and you can stick it in the center of a pipeline, so a copy of your data gets forked to the clipboard.

It’s one of those simple little things that’s remarkably handy. (On my old NeXT there was a command-line ‘copy’ utility; somehow it disappeared in OS X…)

The fact that we could go from conception to completion in under 2 hours of work, including feature creep, is really damned neat.

Published in: on May 7, 2003 at 23:47  Comments (3)  
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Protected: mrph…

This content is password-protected. To view it, please enter the password below.

Published in: on May 7, 2003 at 17:41  Comments Off on Protected: mrph…  

Alright, I have no mind of my own…

(and I’m trying to avoid work)

Purity test

Published in: on May 5, 2003 at 19:05  Comments (6)