How Low Can You Go?

Here’s a couple of posts on the negative-temperature experiment that was in the news last week:

Uncertain Principles: What Does “Negative Temperature” Mean, Anyway?

Built on Facts: Less Than Absolute Zero

The upshot of all this is that many of the stories were generally over-hyping the negative temperature aspect of the experiment, some to the point of simply getting it wrong that somehow this was a new and earth-shattering result. A spin system was put into a negative temperature state way back in the early 1950’s, and (as Matt points out) lasers have population inversions in them as well. One should note that you don’t get these negative temperatures via straightforward thermodynamic means — you have to rig the system to do so, meaning they don’t happen spontaneously.

Banished Balls

Forbidden spheres

Imagine the scenario: you’re a security officer working at Los Alamos. You know that spheres are weapon parts. You walk into a technical area, and you see spheres all around! Is that an ashtray, or it is a model of a plutonium pit? Anxiety mounts — does the ashtray go into a safe at the end of the day, or does it stay out on the desk? (Has someone been tapping their cigarettes out into the pit model?)

All of this anxiety can be gone — gone! — by simply banning all non-nuclear spheres! That way you can effectively treat all spheres as sensitive shapes.

I find this to be an interesting problem — simplifying the task so that someone without the technical skills can make a determination about security. It’s frustrating from the vantage point of the scientist, especially because secrecy tends to run counter to our desire to share our work (an important step in advancing an idea) and also because of the observation about secrecy being contagious, like a disease.

I encountered this when I was in the navy. We had some relatively low-level classified material, from a technical standpoint, and all of it was stamped in red ink and stored in red folders. Security — comprised mostly of students-in-waiting, led by a few permanent staff, only had to have a “see red” mentality, rather than any training on whether a sheet of paper was a set of classified specs or a shopping list. I doubt at Los Alamos that the low-level guards worried about whether spheres were research parts — they had just been told that all spheres were a violation.

Look at the reverse, though. We try and classify things ourselves, and that can have a bad end when it comes to security. Take the incidents a few years ago in Boston involving flashy and/or colored lights. The “bomb” finders caused panic, simply because they had a mental image that objects with flashy lights are what bombs look like.

Pick a Peck of Pockets

A Pickpocket’s Tale

He is probably best known for an encounter with Jimmy Carter’s Secret Service detail in 2001. While Carter was at dinner, Robbins struck up a conversation with several of his Secret Service men. Within a few minutes, he had emptied the agents’ pockets of pretty much everything but their guns. Robbins brandished a copy of Carter’s itinerary, and when an agent snatched it back he said, “You don’t have the authorization to see that!” When the agent felt for his badge, Robbins produced it and handed it back. Then he turned to the head of the detail and handed him his watch, his badge, and the keys to the Carter motorcade.

It's All a Lie

Just Because I Can

To render those images interpretable, to make them available for communication to each other, we need to perform an act of translation. That’s what’s going on above, when you see images labelled “gamma ray” or “radio continuum” with your own eyes, dressed up in lively shades of red and yellow, purple and blue.

To some (and now I’m getting to it) such coloring is a lie, propaganda with which NASA and space scientists in general trick us into paying for the observatories in space and on earth that generate the data behind the fibs. To sane people, it’s what you do to help you think about and understand what it is you’re looking at/for.

Scientists represent information in (one hopes) useful ways. At a fundamental level, false-color is not any different than a chart or a graph.