HoodedHawk

Professor Shing-Tung Yau gave a lecture last night at the Smithsonian (Carmichael Auditorium of Museum of American History), based on his book, The Shape Of Inner Space. He basically described the trajectory of his career over the past 40 years or so, along the way describing “Calabi-Yau” space and how it relates to String theory and maybe even the real world.

The basic tenet of String Theory is that all particles, at their most basic level, are made of vibrating bits of tiny strings. Yes, strings. The way they vibrate basically dictates which particles they manifest as. I won’t even pretend to know the math involved. One non-intuitive (to me as a non-mathematician, anyway) upshot of the string theory math is that it requires (reveals?) a total of 10 dimensions – 6 more than the 4 with which we are most familiar (3 dimensions of space plus time). Turns out according to theory that the extra 6 dimensions are hidden away in Calabi-Yau Space. This invisible space exists at every point in “real” space.

At this point, Prof. Yau asked, “Who cares?”. Well, it turns out the exact shape/geometry of this “Calabi-Yau Space” dictates the properties of our universe and the kind of physics we see.

The lecture was sold out…

Keep reading to see how Yau’s discussion of Mirror Symmetry (spaces) can be related to eating at a British-themed pub…

After the lecture I managed to take some pictures of Washington, D.C. in the evening light. I had a half-mile hike back to the Metro anyway, as I used the Archives stop on the Green line. This involved no train changes, and the weather was just perfect for a walk downtown. It’s actually very relaxed in the evening, as most people have gone home for the day. The downside is that it can be a bit hard to find someplace to eat around the Smithsonian in the late evening. I asked a security guard who happened to be taking a break, and he pointed me to the Elephant and Castle Pub on Pennsylvania Ave. Ok, his exact words were more like, “not much open right now except super-fancy places- just that sports bar over there…”. That was not really what I was looking for, but I was going that way anyway and I had missed dinner, so I stopped in. Glad I did! Got a nice table outside (did I mention perfect weather) and had some Fish and Chips and a London Porter. Yum! Not too pricey, and the fish was delicious – just lightly breaded/ fried crispy and golden. The porter was delicious too- chocolately and coffee undertones.

Mirror Universe? I was quite intrigued by something the waitress said when she brought me my fish and chips (she was a different person than the waiter who took my order): “Hey, that’s funny, I thought I must be seeing things – there’s a guy inside who is also having a Porter, fish and chips, and using an iPad”. Neat!

I wonder if he is in a Mirror Geometry (Mirror Symmetry)? Turns out you can have two Calabi-Yau spaces with different topologies (shapes) but the same resulting set of physical properties (simplistic: i.e. same universe). I wonder what shape the other guy was? :)

Mirror-symmetry is powerful: if you have a hard time solving a problem (typically in string-theory) with one of the spaces, just use its mirror space! This has been successful in many cases, sometimes allowing problems to be solved that have eluded mathematicians for over a century…

From the lecture description at Smithsonian Resident Associates page:

Do we live in a 10-dimensional universe? String theorists believe we do, even though we can sense only four dimensions.

Geometer Shing-Tung Yau has mathematically proven the existence of the elaborate, twisted six-dimensional shapes at the center of string theory. If that theory is correct, these “Calabi-Yau manifolds” (pictured here) may dictate the forces and particles of nature.

Yau tells the story of how physics met geometry and the new picture of the universe that has emerged as a result. He concludes by describing the ongoing exploration of Calabi-Yau spaces and the quest to uncover the shape of this small, hidden domain that may govern almost everything in our universe.

Easter pictures of the littlest siblings. Let’s just say that this image took fewer tries than the Christmas portrait. Barely. But ain’t they just the cutest? Olivia likes to smile for the camera (daddy?) more than her brother, so there are more in-focus shots of her this time. :)

Click any picture for a larger view/slideshow.

One way I was able to get them to pose (a bit) was to let them know that if they let dad take some pictures out front they could go change clothes and go on an Easter Egg hunt in the backyard. That seemed to do the trick.
Olivia decided to open, explore, and play with the first egg she found. Intrepid Egg hunter Preston just zipped all over the backyard filling his basket with eggs. I think the final count was Preston: 21, Olivia: 3. Having mom stand in front of a couple and maneuver Olivia into place was instrumental in bringing Olivia’s egg count to more than 1. A good time was had by all.

I went to a great concert by classical guitarist Ana Vidovic yesterday. The venue was Central Presbyterian church in Towson, MD. Arriving shortly before Ms. Vidovic was to start, I ended up in a rear pew; about as far from her as you could get. But the acoustics of the church are very good, and I could hear her guitar quite nicely.

I really enjoyed hearing Ms. Vidovic playing in person. I first heard her on the recommendation of a coworker; she is an extremely talented and accomplished guitarist!

Fortunately, I learned at a previous (acoustic) concert that my camera has a fairly loud shutter, so I waited until the very end of the concert to pop into the aisle for a picture of Ana – the one real benefit of the rear row was that this didn’t block anyone’s view. I also found the dedicated “quiet” mode of the camera (yes, this does dampen the mirror flip/ shutter release sound!). The above picture is a crop of a shot taken at ISO 3200 (!) with my lens zoomed to 200mm. Not too bad from ~100 feet away (back of the church).

The program:

1. Four Pieces by Astor Piazzolla
• Verano Porteno
• Milonga del Angel
• La Muerte del Angel
• Primavera Portena
2. From 12 Songs for Guitar, arranged by Toru Takemitsu
• Secret Love
• Over the Rainbow
• Yesterday
3. Recuerdos de la Alhambra by FranciscoTarrega
4. Asturias by Isaac Albeniz

INTERMISSION

5. Suite Castellana by Federico Moreno Torroba
• Fandanguillo
• Arada
• Danza
6. Sonata in D major, op. 77 by Mario Castelnuovo Tedesco
• Allegro con spririto
• Andantino, quasi canzone
• Tempo di Minuetto
• Vivo ed energico
7. La Catedral by Agustin Barrios Mangore
• Preludio saudade
• Andante religioso
• Allegro solemne

The only real drawback to the afternoon’s performance was the lady directly behind me who would root around in her purse for 10 minutes hunting her elusive Tic-Tacs. Upon finding them, she would forego merely dissolving them and proceed to crunch them individually. However, she was almost in time with the guitar, so it just added a little percussive accompaniment.

And a good time was had by all.

Every once in a while both Olivia and Preston are smiling at the same time. Nice to see!

But it doesn’t always last. Olivia tends to like to “poke the Tiger”. Sometimes the Tiger pokes back, other times he’s stoic.

A couple of weekends ago Preston and I spent a nice Saturday (March 12) at the Natural History Museum, in Washington, DC. This was the first time I had been since the new “Hall of Human Origins” was opened, and we spent a good bit of time in there. Preston loved all the skeletons/skulls. And of course, he loved the dinosaur exhibits – which hadn’t changed much since last time we were there (~2 years ago). He kept going from exhibit to exhibit: “what is this one? And this one?…” until it felt like I had read every caption in the museum. But he was very happy. Naturally, we had to stop and watch every video/movie presented in the various exhibits.

I did like the Hall of Human Origins; they have a neat entrance tunnel that portrays in a repeating video-mural the evolution of Homo Sapiens from earlier hominids. And the models of the various species of hominids are very life-like. I especially liked seeing a model of Lucy (Australopithecus afarensis) as I had only previously seen (castings) of the (partial) skeleton. And I swear I’ve seen some specimens of Homo neanderthalensis walking among us; that model was particularly enlightening. Pictures of both are below.

This museum isn’t as hands-on as, say, the Baltimore Science Museum, but it still has enough to keep the interest of a 4-year old for most of a Saturday! Afterward we had a bite to eat at the restaurant out by the (temporary during winter) skating rink in the Sculpture gardens. Great way to end the day!

Click any of the images for a larger-size and slideshow. Enjoy!