Could it actually happen?

23 09 2008

I couldn’t believe it when I heard it.  The technology is almost there, and perhaps less than a decade of focused research is needed to make it into reality.  The cost is surprisingly low, as far as national projects are concerned.  Kudos to Japan, the economic and scientific benefits will be absolutely limitless.

I’ve blogged on this before, but I never thought the US would have the political willpower to do something so bold.  I did not expect that another country would either, but I am pleasantly surprised that there is actually a movement afoot to do this.  It’s obviously still no where near an approved project, but the fact that people are seriously thinking about this means a lot.  Maybe I’ll see it in my lifetime after all.


LHC, what is it?

11 09 2008

It’s not as difficult as it sounds. The reason people don’t understand it is because the science writers themselves don’t understand it, and generally don’t try to.

First, some background physics:

All matter in the universe is made up of atoms. Atoms usually consist of protons, neutrons and electrons. The neutron and protons are many, many times larger than the electron and pretty much make up the vast majority of the mass of the atom. The electrons buzz around relatively far away from this nucleus.

The theory that we use to explain the behavior of some of the fundamental forces of the universe is called the Standard Model. This theory is supported by a wide array of experimental evidence, however it does have problems, some of which I will explain in a minute. According to this Model, matter is made up of tiny things called quarks. Therefore, all neutrons, and protons are made up of matter. There is another class of matter called leptons, which make up electrons, but that is unimportant for our purpose.

There are six types of quarks, and they are named up, down, top, bottom, charm, and strange. Neutrons and protons consist of various types of quarks. For example, protons are made up of two ‘up’ quarks and one ‘down’ quark, and neutrons are made up of one ‘up’ quark, and two ‘down’ quarks. I’m sure that you’ve heard that protons are ‘positive’ and neutrons are ‘neutral’, and this is the theory that explains why. The up quark has a charge of +2/3, and the down has a charge of -1/3. So you have 2/3 + 2/3 – 1/3 = +1 charge for a proton and 2/3 – 1/3 – 1/3 = 0 for a neutron. Hadron is another name for this bound state of quarks (making up neutrons and protons). So the Large Hadron Collider, does just what it name says. It basically smashes these protons together, and records what happens.

There is another class of matter, called antimatter. Antimatter is made up of antiquarks (antiups, antidown, etc). So antiprotons is made up of antiup, antiup, antidown, etc. When matter and antimatter collide, they destroy each other. One of the big problems in physics is that why is our universe primarily made up of matter and not antimatter? There should be a reason why if both are created, that only one largely exists? When the universe was created, there should have been equal amounts of matter and antimatter, and as of right now, we cannot explain why antimatter exists in such small quantities compared to matter.

Now that we’ve discussed matter, we can take a look at the forces of nature. There are four fundamental forces of nature: Gravity, Electromagnetism, Weak Force, and Strong Force. Let’s take a quick look at each one:

Strong Force: This binds all the quarks together so they can make things like neutrons and protons. However, this also binds together the protons and neutrons themselves. Without this force holding them tight, the two protons (both of which are positive) in a nucleus would just fly apart due to repulsive forces, so this is what keeps them together.

Weak Force: Weak force deals with radioactivity. It gets a little complicated to understand the interactions between bosons and things, so we can ignore that from now. It is sufficient to understand that it is essential for everything related to radioactivity, and for nuclear reactions. It is much weaker than the strong force.

Electromagnetic Force: This is the force that most people know about (aside from gravity). It is what keeps the electrons attached to the atoms, also what’s responsible for different atoms joining to make molecules (through electron sharing, for example), and generally is responsible for how things behave as liquids, solids, and gas.

Gravity: The most widely known force to the general public, yet probably the least understood. We know what it does, though quite a bit less about how. A graviton is theorized, but it has never been detected (and if the theories are right, it is so hard to detect that it may never be detected). Gravitation, contrary to popular belief, is weak. Extremely weak. It is many orders of magnitude weaker than the rest of the forces. However, it has unlimited range, so at the universe level, it can have a large influence. But at the atomic level, you can’t even notice it and it can be ignored because the other forces are much stronger. To give you an example of how weak it is, think of a small magnet. You have a metal on the ground, and even a small two inch magnet is enough to counteract the force of the entire planet Earth, and the metal will fly towards the magnet. It’s easy to see why gravity doesn’t really do anything at the atomic level.

Now that we’ve discussed the basics of matter and the forces that control it, we can move on to the Big Bang.

The main thing to know is that right after the big bang, as in a trillionth of a second after, there was a huge amount of energy, and it was concentrated in a really small space. There were quarks and other particles we can only dream of, and they were moving around and colliding all the time. The conditions at that time pretty much decided how our universe was going to be forever, so it’s a very important thing to try to understand. Sometimes we can get a clue of what happened by looking in space, and deducing things such as background radiation, speed of certain objects, and other objects at the edge of our telescopes, but it is never going to be as good as trying to recreate the conditions and just watching.

In the beginning, it is theorized that some sort of ‘superforce’ existed. When I say in the beginning, I mean like trillionth of a trillionth of a trillionth of a second after the big bang. Then, that superforce split into the four forces that we know today. About a millisecond into it, protons and neutrons formed, and then the atoms, and the rest is history. However, that first couple milliseconds, and even the first couple seconds after the big bang are vital to understand, and could pretty much tell us the whole nature of the universe if we can figure out what happened.

So how does the LHC recreate the Big Bang?

We take a bunch of hydrogen atoms, and remove their electrons. What is left is a single proton (hydrogen atoms don’t have neutrons and only one proton). We then accelerate these protons really fast. LHC also accelerates lead ions in addition to the simple hydrogen ions. Einstein said E=MC^2, which just means that energy and mass are interchangeable, and you can figure out the amount of energy in mass, or vice versa using that equation.

. It will accelerate two beams as fast as they can go, and then smash them together at full speed (so the two energies are summed, and we can see things at a really really high energy level). Protons are great things to accelerate because they are heavy compared to electrons, so they have a much lower energy loss, so to obtain the highest energy collisions, we need to accelerate the heavier items. Now the reason you use lead is because it has many more protons, so you get even more energy when we smash them together.

The highest energy collision produced by LHC will be less than 1200 TeV. To put that into perspective, that’s probably less energy than dropping a baseball down from head height. It’s not very much energy. But, the important thing is that this energy will be concentrated in an area that is billions of times smaller than the floor, so the energy concentration will be really really high…higher than anything we have been able to observe in a lab. The reason this will be enough to recreate the conditions is because while the total energy is nothing compared to the big bang, the energy concentration will be high enough to match what went on in the first couple milliseconds of our universe. That’s why this is so exciting. This pretty much allows us to watch the big bang on a very small scale, and record what happens!

However, the beams cross each other all the time, and most of the time nothing will hit because atoms are so small, they’ll just go past each other. However, they’ll go around the facility something like 11,000 times per second, so there’ll be a lot of opportunities for collisions here and there. Ideally, you could produce 500,000,000 collisions per second this way, which sounds like a lot, but it really isn’t, considering you have so many particles. So the beams will go around for many hours at a time, to make sure we can get those collisions. A big thing other than the size is the detector. We have to make the best detectors possible to make sure we can see and record these millions of tiny collisions.

What can we learn with the LHC?

First, as I mentioned earlier, the Standard Model is really powerful, but it cannot explain everything. It does not explain dark matter. It doesn’t explain gravity (it explains the other three, but gravity, as mentioned, is elusive). So there are holes in it, and while it makes some great predictions, it falls short.

One important thing it doesn’t predict (for our purposes) is that it doesn’t predict why some particles have a little mass mass, some have a lot of mass, and some don’t have any mass. The hypothesis is that the entire universe is contained in something called a Higgs field. If you interact a lot with this field, you have a lot of mass. If you don’t interact with this field, you have no mass. However, if the Higgs field exists, we must also have a particle called the Higgs Boson. If, such a particle exists, the theory is correct. This would be huge, because for all its problems, Standard Model has made a lot of predictions, and if the Higgs Boson doesn’t exist, or if something else exists in its place, we could have a revolution in Physics.

Another thing is gravity – that annoying unexplainable force (well not really unexplained, but one that doesn’t fit). LHC may tell us about something called supersymmetry, which basically says there are larger, heavier partners to particles that we know, but we haven’t been able to show this yet. LHC is not strong enough to detect all of them, but we should be able to detect at least some, that would be enough to start working on one of the other holy grails of physics (The Theory of Everything), which unites all FOUR forces instead of three out of four that we can do now.

Now, another thing it can help us find is antimatter. When the universe was created, both matter and antimatter was created, and it should have been created in the same amount, but yet only one makes up the vast majority of the universe. So smashing these things together, maybe we’ll see what happens to antimatter.

There are also about ten other things that we hope to find, or at least for me, I hope that we find something else, but that is the gist of it.

God Given Right to Superiority

5 08 2008

This article from the New York Times is a source of endless amusement.  The New York schools are highly upset that some excellent clinical spots are being taken up by the graduates of Caribbean medical schools.

‘Clinicals’ are an integral part of medical education, consisting of rotations through various specialties in medicine where students can learn side by side with physicians.  This process goes on for two years before students pick a residency and their specialties.  It gives students exposure to a variety of specialties and increases their overall knowledge about medicine.  It is also the time they start applying all the things they’ve learned during the first two years to a real life situation.

So these spots are highly important, and New York schools are crying that a Caribbean school took the spots from them.  For reference, a third of new physicians in the US have gone to medical schools not in the US.  Why?  Well, because of the medical schools themselves.

The problem is that it’s their fault that the Caribbean schools even exist. In order to inflate demand, the AMA and the schools kept market really tight for doctors by severely limiting enrollment.  Those were obviously not enough, so they kept admitting thousands of FMG’s while denying seats to potential American students.  And to justify their actions, they kept on blowing smoke up people’s rear end by warning of an impending ‘physician oversupply’.

When they couldn’t keep saying that with a straight face anymore, they finally relented and admitted there was a chronic under supply and that all schools should increase enrollment. You force US students to go elsewhere, and then you complain that they are infringing on your God Given Right to get the best clinical spots? Tough ****, as far as I’m concerned.  These are US students that went to the Caribbean because your short-sighted and greedy policies forced them to.  I’d rather have more US graduates becoming doctors than importing graduates from other countries.

It is even more galling that schools like NYU complain about physicians in New York City hospitals, considering most of NYU graduates (just like all US medical graduates) tend to go into high paying specialties, leaving the much needed jobs in primary care medicine to graduates from foreign countries and the Caribbean.  So not only are the Caribbean schools a product of their own short-sightedness, I can argue that they provide a bigger service to the health of the US population than the New York schools do.  Specialists are nice, but the US really needs primary care doctors.  Grads from NYU and Albert Einstein aren’t going into Family Medicine, so give the spots to people who actually might be.

The politics of space

21 06 2008

So my bullshit detector has been going off at an alarming frequency lately, which leads me to believe that another election must be near.  Our first idiot this season is Barack Obama (we’ll get to McCain some other time), who has proposed the most illogical, backwards, and idiotic space policy that I’ve ever seen from a democrat.   Bush’s isn’t any better, with his blind push to the moon, so that we can go there and then maybe Mars, and follow that up with another fifty years of absolutely nothing.  But at least his plan may yield some useful knowledge about space exploration.

But back to Barack Obama, his policy is simple:  divert the budget of the manned space program of NASA into the black hole that is the education budget, and focus on the unmanned missions.  Why?  According to him, NASA doesn’t inspire as it used to, and so its funds would be better spent on educating the young and reaching out to them in the classroom.  Because we all know that a teacher droning about space is more inspiring than a moon landing.  The moron doesn’t realize (or admit) that the reason NASA doesn’t inspire as it used to is because idiots like him have already stripped the manned space program dry.  If you allowed NASA to actually do something with the space shuttle instead of using it as a ferry to fix up the rickety old barge known as the International Space Station, you might actually inspire some kids.  But that would be too logical, and its NASA’s fault that no man has left the orbit of this planet since the Apollo missions ended in the early seventies.

That’s almost forty years, an entire generation has reached middle age without being inspired by the space program because morons like Obama expect kids to become interested in math and science while slashing the very source of that inspiration.  A rational space policy, whether your goal is simply advancement of humanity, or to motivate the next generation of kids, would be to place the manned space program at the center of the space policy, instead of making it scrounge money from the fringes.  For the first time in decades, when the Shuttle system retires, we’re about to enter an era when the United States lacks the capacity to send humans into space.  That, more than anything else going on in our country today, depresses the hell out of me.

You really want to ecourage the kids?  Put forth a bold new plan and give NASA the resources to make headlines by putting people on Mars, the astreoid belt, and further out.  And not the one off missions that are the staple of politicians – but a well thought out, progressive expansion out into space.  In the end, if true commercialization of space is achieved, it will have to be on the backs of governments who can pour the initial investment into it.  And unlike education, it’s not a black hole, as the economic and social benefits to true expansion into space are absolutely incalculable.  That revolution would make the beginning of the electronic age look like a minor blip.

The describable universe

19 06 2008

I first read this article several years ago, and it has to be one of the best I’ve ever read.  One of the most puzzling things about our universe is that it is so describable by a bunch of bipedal monkeys and their made up language.  Math is something abstract – it does not exist in any traditional sense, and yet it can describe the very universe with ever-increasing accuracy.  It seems odd that this should be the case, especially as it seems to describe it perfectly.

I highly recommend the article I linked, and it is something to think about when learning or teaching math.  It is easy to get stuck in the minor details, but if you truly understand the applications, it can’t help but cultivate your awe at its effectiveness.

I’ll post a part of the article here:

Having refreshed our minds as to the essence of mathematics and physics, we should be in a better position to review the role of mathematics in physical theories.

Naturally, we do use mathematics in everyday physics to evaluate the results of the laws of nature, to apply the conditional statements to the particular conditions which happen to prevail or happen to interest us. In order that this be possible, the laws of nature must already be formulated in mathematical language. However, the role of evaluating the consequences of already established theories is not the most important role of mathematics in physics. Mathematics, or, rather, applied mathematics, is not so much the master of the situation in this function: it is merely serving as a tool.

Mathematics does play, however, also a more sovereign role in physics. This was already implied in the statement, made when discussing the role of applied mathematics, that the laws of nature must have been formulated in the language of mathematics to be an object for the use of applied mathematics. The statement that the laws of nature are written in the language of mathematics was properly made three hundred years ago; [ It is attributed to Galileo.] it is now more true than ever before. In order to show the importance which mathematical concepts possess in the formulation of the laws of physics, let us recall, as an example, the axioms of quantum mechanics as formulated, explicitly, by the great physicist, Dirac. There are two basic concepts in quantum mechanics: states and observables. The states are vectors in Hilbert space, the observables self-adjoint operators on these vectors. The possible values of the observations are the characteristic values of the operators – but we had better stop here lest we engage in a listing of the mathematical concepts developed in the theory of linear operators.

It is true, of course, that physics chooses certain mathematical concepts for the formulation of the laws of nature, and surely only a fraction of all mathematical concepts is used in physics. It is true also that the concepts which were chosen were not selected arbitrarily from a listing of mathematical terms but were developed, in many if not most cases, independently by the physicist and recognized then as having been conceived before by the mathematician. It is not true, however, as is so often stated, that this had to happen because mathematics uses the simplest possible concepts and these were bound to occur in any formalism. As we saw before, the concepts of mathematics are not chosen for their conceptual simplicity – even sequences of pairs of numbers are far from being the simplest concepts – but for their amenability to clever manipulations and to striking, brilliant arguments. Let us not forget that the Hilbert space of quantum mechanics is the complex Hilbert space, with a Hermitean scalar product. Surely to the unpreoccupied mind, complex numbers are far from natural or simple and they cannot be suggested by physical observations. Furthermore, the use of complex numbers is in this case not a calculational trick of applied mathematics but comes close to being a necessity in the formulation of the laws of quantum mechanics. Finally, it now begins to appear that not only complex numbers but so-called analytic functions are destined to play a decisive role in the formulation of quantum theory. I am referring to the rapidly developing theory of dispersion relations.

It is difficult to avoid the impression that a miracle confronts us here, quite comparable in its striking nature to the miracle that the human mind can string a thousand arguments together without getting itself into contradictions, or to the two miracles of the existence of laws of nature and of the human mind’s capacity to divine them. The observation which comes closest to an explanation for the mathematical concepts’ cropping up in physics which I know is Einstein’s statement that the only physical theories which we are willing to accept are the beautiful ones. It stands to argue that the concepts of mathematics, which invite the exercise of so much wit, have the quality of beauty. However, Einstein’s observation can at best explain properties of theories which we are willing to believe and has no reference to the intrinsic accuracy of the theory. We shall, therefore, turn to this latter question.

More on the space elevator

16 06 2008

Is the Space Elevator Feasible?

The question that many people have is whether a space elevator is simply a product of overactive imaginations from the Sci-Fi world, or is it an engineering possibility? For people unfamiliar with the idea, the notion of a 36000-mile elevator seems fantastic and ridiculous. Nevertheless, if you analyze the problem, the idea turns into something that is manifestly possible.

First things first – what exactly is the space elevator? For once, the name pretty much describes exactly what it is. It consists of an extremely strong thread of material going from the geosynchronous orbit to a spot near the equator on earth. Alternatively, if you don’t want to go all the way to the geosynchronous orbit, you need a counterweight at the top to keep the thread tight.

Once you have that, you can use simple electrical power (costing maybe $100/lb) to transport supplies (and people) all the way up into orbit. And really, most of that power could be recovered on the way down. It would be almost cheap – as cheap as airline tickets, to go to space. There will always be a price limit imposed by conventional rocket fuel – and there will not be commercial or private exploitation of space at any great level until something like a space elevator emerges.

But back to the elevator – is it possible? Obviously, the material in the thread would have to be exceptionally strong to withhold the pressures imposed on it, not to mention withstand weather patterns and other forces. Until very recently, such a material did not exist. Diamond could possibly have done it (but it would have very low capacity), and the price of a 36000 thread of diamond would be prohibitive.

The answer is [almost] carbon nanotubes. Carbon nanotubes are not quite there yet in terms of the strength required, but they are rapidly going there. The total cost of the space elevator, at $5 billion to $20 billion may sound like a lot, but it is actually not prohibitive, considering the costs of other things in space. We’re wasting millions of dollars on frivolous technologies, and this has the possibility of completely revolutionizing our society. Imagine a cheap, easy way to reach space. Everything follows from that point, from the mining of asteroids to permanent colonization of space. We wouldn’t need to build space ships that are pretty much huge fuel tanks with a small tip with a couple people sitting on top.

The calling card of the ignorant

7 06 2008

In their never-ending drive to slowly transform the United States into a dystopia, the morons now use scientific terms to try to prove their point, banking on the ignorance of their audience.

Aside from the ridiculous assertions about how planets spinning the ‘wrong way’ disproves the Big Bang theory (what!?!), the big claim put forth by many creationists (read: crazy bozos) is that of thermodynamics and how it ‘disproves’ evolution. For those fortunate enough to be unaware of this line of attack, the basic thrust of creationists is that the second law of thermodynamics says that the universe is traveling towards more entropy and because of this, life cannot arise since it allows for more complex life.

Sounds logical enough to confuse those who have no experience with science, and sadly the argument is prevalent. Instead of showing myself how monumentally wrong this understanding of thermodynamics is, I’ll just post a video of someone who has already done it:

I guess the creationists forgot about the Sun.