Search found 307 matches

by Aiwendil
Wed May 18, 2011 8:07 pm UTC
Forum: Science
Topic: Quantum Computing - Measurement
Replies: 13
Views: 1761

Re: Quantum Computing - Measurement

Aiwendil, your posts are helping me understand this subject more and more lol. I understand the need for vector spaces and linked it in with my understanding of the Bloch sphere. Now I wonder, if |0> is interpreted as 0 and |1> is interpreted as 1 then what do |2> and |3> represent? I have learnt t...
by Aiwendil
Wed May 18, 2011 3:17 pm UTC
Forum: Science
Topic: Quantum Computing - Measurement
Replies: 13
Views: 1761

Re: Quantum Computing - Measurement

I mean in our course we have vectors like |0> = ( 1 0 ) |1> = ( 0 1 ) and then we can even expand it to C^4 and have |0> = ( 1 0 0 0 ) and | 3 > = ( 0 0 0 1 ) etc. What do these states actually represent? I mean it's not like standard computation where you can have either 1 or 0, here I have a vect...
by Aiwendil
Tue May 17, 2011 9:43 pm UTC
Forum: Science
Topic: Quantum Computing - Measurement
Replies: 13
Views: 1761

Re: Quantum Computing - Measurement

I intended to try to give you a succinct answer, but I'm afraid it turned out somewhat long-winded. I don't know if you'll find it useful or confusing, but here it is: Basically, an observable is a measurable dynamical property of a physical system. Position, momentum, and angular momentum are typic...
by Aiwendil
Mon May 16, 2011 12:03 am UTC
Forum: Language/Linguistics
Topic: Concise writing
Replies: 23
Views: 4313

Re: Concise writing

Qaanol wrote:Use nouns. Use verbs. That is it.


And pronouns, apparently.
by Aiwendil
Sat May 14, 2011 3:59 am UTC
Forum: Science
Topic: Good introduction to thermodynamics?
Replies: 6
Views: 2897

Re: Good introduction to thermodynamics?

Are you looking for just thermodynamics per se, or do you need a statistical mechanics text? If it's just thermo, there's a very good little book by Fermi that (in my opinion) makes things very clear conceptually.
by Aiwendil
Thu May 12, 2011 3:53 pm UTC
Forum: Books
Topic: xkcd's favourite 100 books - vote now!
Replies: 226
Views: 165676

Re: xkcd's favourite 100 books - vote now!

Updated. 1 Hitchhiker's Guide to the Galaxy series ( Douglas Adams) -- 30 2 Ender's Game (Orson Scott Card) – 18 Lord of the Rings (J.R.R. Tolkien) -- 18 3 1984 (George Orwell) -- 16 4 Discworld ( Terry Prachet ) -- 15 5 Harry Potter series ( J.K. ...
by Aiwendil
Wed May 11, 2011 10:06 pm UTC
Forum: Science
Topic: A couple of quantum thought experiments/ideas
Replies: 16
Views: 2399

Re: A couple of quantum thought experiments/ideas

It only shows that a conscious observer is not what is meant by "observer" in any possible collapse theory. It is still possible, given the experiment, that collapse occurs when the particles interact (sufficiently, depending on the interpretation) with any other particles. This is really...
by Aiwendil
Tue May 10, 2011 9:43 pm UTC
Forum: Language/Linguistics
Topic: Moderatores Populusque XKCDi [Latin]
Replies: 164
Views: 62293

Re: Moderatores Populusque XKCDi [Latin]

Commissum illud tibi nonne maior est? Censeo id operam gravem esse. Nihilo setius opto ut gaudium ad transferre habeas. Sic ita, id est commissum gravis. Sed scripturas ab Tolkien valde diligo faveoque, et linguam Latinam exercere volo; aptus igitur est hic conatus. Atque duos libros in lingua Lati...
by Aiwendil
Tue May 10, 2011 3:27 am UTC
Forum: Science
Topic: A couple of quantum thought experiments/ideas
Replies: 16
Views: 2399

Re: A couple of quantum thought experiments/ideas

Collapse isn't an event that happens objectively. It's what we call it when you (or you via the proxy of your detection device) entangle yourself with the system sufficiently that you are no longer interacting with the closely-related other world you created. The cat is never superposed from its ow...
by Aiwendil
Mon May 09, 2011 10:16 pm UTC
Forum: Language/Linguistics
Topic: Moderatores Populusque XKCDi [Latin]
Replies: 164
Views: 62293

Re: Moderatores Populusque XKCDi [Latin]

Linguam quinque annos in schola studui, sed ex longo eam non uti quod nunc iam tres annos studeo biologiam in universitate. Quidem, ego physicam studui in universitate, quare non saepe otium ad studendam linguam Latinam habui. Sed nunc (abhinc circa annum) curo nonnullum mei temporis liberi Latinae...
by Aiwendil
Sun May 08, 2011 7:28 pm UTC
Forum: Language/Linguistics
Topic: Moderatores Populusque XKCDi [Latin]
Replies: 164
Views: 62293

Re: Moderatores Populusque XKCDi [Latin]

Oppido bene! Conatum discendis tuum admiror atque te cito linguam in modo velut Romanes cum ea loqui discere spero. Heu, longum tempus futurum esse antequam velut Romanes loqui discam credo. Etiam si aliquantum bene scribere possum, tardissime scribo et saepe necesse est ut glossarium et librum gra...
by Aiwendil
Fri May 06, 2011 12:34 am UTC
Forum: Science
Topic: Centrifugal Force Query
Replies: 18
Views: 5037

Re: Centrifugal Force Query

Sorry, but if you think Aiwendil's explanation was better than mine, you are exemplifying everything that is wrong with science education. Throwing around extremely abstract math concepts like "the equations won't work in a rotating frame!" is NOT explaining anything. Look, I wasn't tryin...
by Aiwendil
Thu May 05, 2011 3:08 pm UTC
Forum: Language/Linguistics
Topic: Moderatores Populusque XKCDi [Latin]
Replies: 164
Views: 62293

Re: Moderatores Populusque XKCDi [Latin]

Gigano wrote:Ergo facere temporem debes!


Quidem conor quotidie paulum in lingua Latina scribere, cum non iam in schola studeam.

Video te Groningen habitare. Frisiamne linguam dicis? Paululum eam studeo quoque.
by Aiwendil
Thu May 05, 2011 12:45 am UTC
Forum: Science
Topic: Quantum Entanglement
Replies: 39
Views: 5774

Re: Quantum Entanglement

Ah, I think I finally understand what your concern is. You're worried that if both electrons were measured at exactly the same time, then they won't have a chance to "tell" each other what state they collapsed into - is that right? In other words, electron 1 could collapse to a spin-up sta...
by Aiwendil
Wed May 04, 2011 11:25 pm UTC
Forum: Science
Topic: Quantum Entanglement
Replies: 39
Views: 5774

Re: Quantum Entanglement

why would the electrons know how to collapse properly?


The wavefunction collapses when either electron's spin is measured. It doesn't matter whether the measurement is made on electron 1 or electron 2 or both at the same time.
by Aiwendil
Wed May 04, 2011 9:20 pm UTC
Forum: Science
Topic: Quantum Entanglement
Replies: 39
Views: 5774

Re: Quantum Entanglement

So, like I was asking, since observation affects the property of the electrons, what happens when two observers independently observe each end of the entanglement at the exact moment? Relativity tricks aside, the same moment. If the boxes were a lightyear apart, the information would still travel i...
by Aiwendil
Wed May 04, 2011 3:39 pm UTC
Forum: Science
Topic: A couple of quantum thought experiments/ideas
Replies: 16
Views: 2399

Re: A couple of quantum thought experiments/ideas

When actually any interaction of anything with the waveform would cause a collapse. You cannot have a cat in a superposition, as it is more than 1 thing*. That's not true. QM doesn't care whether something's "1 thing" or a composite object. True, as you move to larger composite objects, t...
by Aiwendil
Wed May 04, 2011 2:14 pm UTC
Forum: Science
Topic: Centrifugal Force Query
Replies: 18
Views: 5037

Re: Centrifugal Force Query

Centrifugal force is a "fictitious force". If you have something rotating and you analyze it from the point of view of a stationary observer, then there is no centrifugal force. In other words, in this case, the motion of everything is correctly described using the real forces that apply. ...
by Aiwendil
Tue May 03, 2011 10:03 pm UTC
Forum: Science
Topic: A couple of quantum thought experiments/ideas
Replies: 16
Views: 2399

Re: A couple of quantum thought experiments/ideas

It has since been recognized that a conscious observer is not necessary to collapse the wave function, any measurement will do (this is also illustrated in the double slit experiment). In the case of Schrodinger's Cat, the waveform is collapsed at the device the uses the decay of the radioactive nu...
by Aiwendil
Mon May 02, 2011 8:05 pm UTC
Forum: Language/Linguistics
Topic: Definition of language
Replies: 20
Views: 3201

Re: Definition of language

My working definition is "Any formal system that is isomorphic to cognitive structures", but I'm not sure if that's either broad or specific enough to be correct. Well, for one thing that definition would appear to be contingent upon a particular resolution of the philosophical debate ove...
by Aiwendil
Mon May 02, 2011 4:11 pm UTC
Forum: Science
Topic: Quantum Spin?
Replies: 16
Views: 2244

Re: Quantum Spin?

When you measure the total rotational momentum of a particle, and then the momentum on the x, y and z axis, you realize it doesn't work. You need a fourth term, spin, which behaves a lot like rotation around a fourth axis. That's not quite right. The spin of a particle is its total rotational momen...
by Aiwendil
Mon May 02, 2011 3:49 pm UTC
Forum: Books
Topic: xkcd's favourite 100 books - vote now!
Replies: 226
Views: 165676

Re: xkcd's favourite 100 books - vote now!

There's another vote for h2g2 buried in the singles at number 15.


I think that was a vote for just the first book as opposed to the whole series, hence its being counted separately.
by Aiwendil
Mon May 02, 2011 1:58 pm UTC
Forum: Language/Linguistics
Topic: Moderatores Populusque XKCDi [Latin]
Replies: 164
Views: 62293

Re: Moderatores Populusque XKCDi [Latin]

Enim credo nonne optimum discendis modum esse.


Ita vero. In lingua Latina dicenda (vel scribenda) valde gaudeo. Sed occasionem non saepe habeo.
by Aiwendil
Sun Apr 24, 2011 4:28 am UTC
Forum: Science
Topic: God Particle?
Replies: 12
Views: 2089

Re: God Particle?

Galaxy rotation curves ---> Dark Matter Well, galaxy rotation curves and galaxy cluster/supercluster rotation curves and CMB anisotropies and gravitational lensing in the Bullet Cluster. In short, there's a ton of evidence for dark matter, and alternative ideas like modified gravity haven't (yet) b...
by Aiwendil
Fri Apr 22, 2011 6:28 pm UTC
Forum: Science
Topic: God Particle?
Replies: 12
Views: 2089

Re: God Particle?

It's a rare form of matter That depends on what you mean by "matter". In the sense of "something that has mass", yes, it is matter. But I think many people would restrict the application of the term "matter" to the Fermions and the composite particles made of them. Of ...
by Aiwendil
Wed Apr 13, 2011 5:45 pm UTC
Forum: Mathematics
Topic: Random Integer
Replies: 18
Views: 2448

Re: Random Integer

And neither is there one on [0, 1].


Huh? That would mean there's no such thing as a continuous uniform distribution, which I'm pretty sure is not true.
by Aiwendil
Tue Apr 12, 2011 4:38 pm UTC
Forum: Science
Topic: Unification of forces in early universe
Replies: 13
Views: 2735

Re: Unification of forces in early universe

After doing a little research, it seems that the word "force" means an interaction between the Fermions This is essentially correct, but it's not necessarily between fermions; although bosons are the 'carriers' of the forces, they can sometimes experience interactions as well. For instanc...

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