Posts tagged astrophysics.

Art by { dvdp }

THE PHYSICS OF SPIRALS?

Perhaps someone with more experience in math & physics can give some insight about this:

I’ve subscribed to a weekly newsletter from { Kurzweil AI } (Many of you might find it interesting; it covers futurism, technology, science, etc.) Recently, there were two consecutive articles about spiral shapes that I found curious:

{ Pasta-shaped radio waves beamed across Venice }

A group of Italian and Swedish researchers may have solved the problem of radio congestion by cleverly twisting radio waves into the shape of fusilli pasta, allowing a potentially infinite number of channels to be broadcast and received.

& { Scientists twist light to send data at more than 2 terabits per second }

A multinational team led by USC with researchers in the U.S., China, Pakistan, and Israel has developed a system of transmitting data using twisted beams of light at ultra-high speeds — up to 2.56 terabits per second.

Broadband cable supports up to about 30 megabits per second. The twisted-light system transmits about 85,000 times more data per second.

Is there something inherent to spiral shapes that allows them to hold more “information”? (I’m using the word info. in a general way, like if we think of the universe as a system of variously configured “bits” of info.) Is the relationship — in terms of information — between these technologies and natural constructs like DNA and galaxies more than an aesthetic correlation? If it’s true that spirals “hold more”, why is this?

P.S.
I’ve also asked this question at { Udacity }, if any of you are enrolled in Intro to Physics. I’ll re-post answers here if anyone answers there, and vice versa.

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ANSWERS:

{ memeengine }:

olena:

THE PHYSICS OF SPIRALS?

I’ve heard a little about that second item - use of “twisted” light in optic cables.  If you read my blog, you’ll know I’m no physicist, but I can offer my limited understanding…

Physically, I’m not sure if we’re talking about photons forming a spiral shape as they move.  It may have something to do with the polarity of the photons.  However, I think that what allows more information to be crammed in is something like different channels.

Even if it’s not completely accurate, I think that color is a good way for us amateurs to understand it.  You may know that white light contains all the colors of the rainbow (ie all frequencies of visible light).  Imagine if instead of sending one message in the white light, many messages could be encoded among the individual colors (frequencies) within the light.  So there could be a “red message”, a “green message”, etc.

The idea of twisting the light may have something to do with teasing apart the different frequencies, or channels so the individual messages can all be read.  Clearly, this has a multiplicative effect on the information that can be sent.

I think some of this research also looks at laying “meta-messages” on top of the normal light pulses.  Imagine if the rate at which the light pulses are sent were marginally slowed down or sped up.  This too can send information, and in theory, none of the original information from the pulses is lost (only perhaps marginally slowed).  Think of sending morse code by switching from intervals of slow pulses to intervals of quick pulses.

I know I’m not close to having a handle on this story in terms of the physics, but I think the above pseudo-examples capture the ideas of the more tightly packed information.  Hope this helps!

OS re: { memeengine }:

Thanks for answering! I wonder if DVDP’s image inspired that explanation? :D

Light can be twisted like a corkscrew around its axis of travel.

Optical Vortex }

It seems that just the actual wave, as it travels, is made to rotate as if it were going around the outside of a tube. I don’t know if that contradicts what you said —

“…I’m not sure if we’re talking about photons forming a spiral shape as they move…”

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Thyrm at { Udacity }:

Well, I can tell you that DNA coiled up can hold more information because its structure maximizes surface area while decreasing the volume that it occupies. If you were to uncoil DNA then it be about a meter long. If you unwrapped the two strands, then it’d be twice as long. Mind you, this is with one molecule of DNA that can easily fit inside the tiniest organelles of one of your cells. The geometry involved in that is beyond me. I am sure somebody else has a better answer.

Another amazing material that has a lot of surface area is activated carbon. Its surface area is absolutely insane, at about 500 sq. meters per gram.

Also, you might be interested in this: { http://en.wikipedia.org/wiki/Menger_sponge }

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{ hpgal3 }:

It could be something to do with the surface area. I remember seeing something on “Through the Wormhole” about the surface area of an object being where it holds most of its information (not its volume). This is true in biology as well, yes. Especially in folds, like your mitochondria and intestines. You just have more room.

http://www.youtube.com/watch?v=WbRvHbtB9AQ

Starts around 27:27

Cosmism ›

sinribbon:

olena:

roberto:

olena:

itsturtles:

olena:

see also: { Is God an Alien Mathematician? }

HUGO DE GARIS: I defined these two terms rather succinctly in the { kurzweilai.net essay } so I’ll just quote those definitions here.  Deism is “the belief that there is a ‘deity’ i.e. a creator of the universe, a grand designer, a cosmic architect, that conceived and built our universe.”  Cosmism is the “ideology in favor of humanity building artilects this century (despite the risk that advanced artilects may decide to wipe out humanity as a pest).” 

I think de Garis ignores a crucial point: there had to be an origin universe, a beginning somewhere. If we assume that artilects created the universe/s, then we must also assume there had to be an original ‘artilect.’ Who made the artilect? This goes unexplained. 

…Also why the assumption that future AI will destroy us like ants? If they are indeed more complex than us (and possibly sentient), then I think they would have a more complicated reason to kill us all than irritation.

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OS:

The assumption about being destroyed by our creations is not necessarily de Garis’s so much as his [somewhat satirical?] response to a wide-spread fear that we see reflected/purveyed in { pop culture }.

For a Cosmist, it’s not really an issue — partially because we don’t buy into the whole Armageddon-by-cyborg-menace thing and partially because, upon comprehending the big picture of the Universe (even at the scale we know it now: from the quantum to the intergalactic cosmos or perhaps the multi-verse), it’s hard to care so much about Humans as they are in this moment. We’re open to changing the human, to becoming trans- and eventually post-human, even if it means this race as we know it ceases to exist. [Maybe that sounds scary & needs explaining, but it’s not something I want to go further into right now.]

To the point about the “artilect” — in some sense, yes, it’s unexplained. However, that term means to refer to a conscious something that would eventually come about, either from us or from another “IGUS” (information gathering and utilizing systems — Murray Gell-Mann). An artilect and the “first creator” (“God”) could be totally different, especially if the first creator was not so much an entity as a set of conditions (/laws).

Besides that, I disagree that “there had to be a beginning”. In so far as we’re able to understand, yes it seems that way, but a series of infinite loops is also possible — even if that thought gives us a very large headache. We don’t know about that (yet?).

That considered, it’s likely that de Garis is ignoring all that purposely, for the sake of entertaining/introducing a new thought without engaging in a (at this point) useless conversation about a genesis.

I was just going to add this, but see it was already done so above. In my own words: 

Most people assume there has to be a beginning because of our immediate experiences with cause and effect. Although evidence points to an event like the ‘big bang’ which led to the structures we now know as the universe, we aren’t certain of it yet, and even if we are, there could have been something unimaginable before space-time, or there could simply be more space-time before the big bang (a la Hawking’s big-crunch concept). Well I don’t remember if it’s his concept, but that’s where I last read about it. 

I kind of enjoy the mindfuck of no beginning. Just sayin.

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Yes, good addition!

Also the { Big Bounce }: (you have to lol at those names)

a theoretical scientific model of the formation of the known universe. It is implied by the cyclic model or oscillatory universe interpretation of the Big Bang where the first cosmological event was the result of the collapse of a previous universe.

Hawking does not consider the Big Crunch to be very plausible. He and other scholars of the community more so invest in the theory that galaxies will drift so far away from each other their light can no longer be seen. Consequently, all hydrogen will eventually be used up within stars, and the universe will grow dark and no such cycle will take place. Galaxies are continuing to move further away from each other with increasing speed, so this is the logical conclusion many of the scientific community have reached.

I choose to believe there is a continuing cycle however, even if the scope is far greater than we can comprehend. Because of the movement of galaxies, a universal beginning is appropriate. Due to the cyclical nature of all things on Earth and in space, it would also be appropriate there may be a grander cycle at hand even if all light dwindles and returns to darkness; matter and energy can change from one into the other after all, so there may be hope in that fact. We may truly be a universe within universe, created by artilects or within an unseen cycle that begins anew in darkness. It is my theory that perhaps galaxies do not drift apart because of dark energy but because they are drawn to something else beyond our knowledge. In any case, I think what is most important is that we keep observing and hypothesizing, and perhaps artilects will create and embody universes after all. Thanks for the read, OS.

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OS:

Thanks for adding this! Great to have some dialogue.

& That reminds me; apparently the dark matter theory may be on the way out, according to some recent research from Chile: { Serious Blow to Dark Matter Theories? }

Also, I Googled around a bit, but could you provide a source for Stephen Hawking recalling the Big Crunch idea? Curious to learn more about that.

The Square Kilometre Array (SKA)

inthenoosphere:

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The world’s most powerful radio telescope — the SKA — will search for ripples in the fabric of space-time, allow us to explore deep space, and will help us answer our biggest questions about it.

Brendan Monroe
Islands

The story is a solitary journey though astrophysics that becomes a fusion of a recurring dreams.

A Brief History of the Universe ›

(via freshphotons)

scienceisbeauty:

Formation of Structure in the Universe

Credit&Source: Jim BrauDepartment of PhysicsUniversity of OregonThe Early Universe, Toward the Beginning of Time