Omegle si geometria non-euclidiana

Tocmai mi-am consumat ultimele 3 ore discutand cu "straini absolut" pe chestia asta interesanta numita Omegle. A fost chiar mai placut decat ma asteptam. Iata logul unei discutii pe care am avut-o:

You're now chatting with a random stranger. Say hi!

Stranger: why?

You: Because you can't handle it.

Stranger: :(

Stranger: you make me sad and happy inside

Stranger: thanks :(

You: I'm like Intel.

Stranger: yay

Stranger: intel for the.. lose

You: Just that I'm outside.

Stranger: oh...

Stranger: why?

Stranger: your outside..

Stranger: why..

Stranger: its cold!

You: No, I mean metaphysically.

Stranger: no shit

You: Yeah.

You: What's up ?

Stranger: or is it shit?

Stranger: ponder that question

Stranger: the sky

You: I don't know, I guess depends on religion.

Stranger: ?

Stranger: how are you?

You: I'm good.

You: And you ?

Stranger: pretty good

Stranger: ok

Stranger: lemme try and guess you

You: Go ahead.

Stranger: hmmm

Stranger: m 20+ (usa/canada/england)

Stranger: im sure one of them will be right

You: 22, actually.

Stranger: unless your a f 10 from china

Stranger: 20+

Stranger: all right?

You: No, I;m a guy.

Stranger: 2 right

You: Yeh.

Stranger: and the end

Stranger: ?

You: No, none of those countries.

Stranger: dammit..

Stranger: which one?

You: Yeah.

You: You scored low today.

Stranger: 2 right..

Stranger: pretty good?

Stranger: country is harder though

You: Yes.

Stranger: gender is out of 2 (suprisingly)

Stranger: which country you from?

You: Romania.

Stranger: cool

Stranger: would have took me along time to guess

You: What about you.

You: Yep.

Stranger: do you wanna guess

Stranger: or shall i just say?

You: I'

You: I'll guess.

You: After we speak a while.

You: So tell me about your day.

Stranger: ok

Stranger: my day

Stranger: it was ok

You: What life changing revelations did you have today ?

Stranger: i found a dead frog

You: Interesting.

Stranger: was pretty life changing

You: You know suffering is the first of the 4 noble truths.

Stranger: :(

Stranger: i know

You: HAve you thought of suffering ?

Stranger: damn noble truths

You: When you saw the frog.

Stranger: when you say suffering

Stranger: do you mean suffering things?

Stranger: or my suffering?

You: Suffering in general.

Stranger: or other peoples/things suffering

Stranger: abit

You: The feeling of suffering.

Stranger: it was quite horrible

Stranger: i mean

Stranger: a cat attacked it

Stranger: and left it

You: Did you saw the whole thing ?

You: *see

Stranger: yes..

You: Sorry, It's 1 AM here.

You: Did you have a good day besides the dead frog ?

Stranger: yeah

Stranger: 1am?

Stranger: its...

Stranger: damn

Stranger: cannot reveal

Stranger: its 5am?

Stranger: or maby 5pm

You: 1 AM is 1 in the night.

You: Or at night.

Stranger: yes

Stranger: wanna guess yet?

You: It's Monday here already.

Stranger: :o

Stranger: already.

Stranger: nooo!

Stranger: you better get sleep?

You: No, I;m good.

You: Don't work.

You: Only got school.

Stranger: ok..

Stranger: cool

Stranger: what do you do at school

You: And today I'm free.

Stranger: what do you study?

You: Applied Physics.

You: Do you study anything ?

Stranger: yes

Stranger: i mean

Stranger: dam..

Stranger: age slightly revealed

Stranger: not that my grammar and typing will show it anyway

Stranger: i do maths physics biology and chemistry

You: So you're in highschool.

Stranger: pretty much

Stranger: come on

You: Or coming out of it.

Stranger: i had hardly any clues

Stranger: how many do you want

Stranger: yes im in highschool

Stranger: (we call it college here in ......)

You: And you study natural sciences.

Stranger: not really

You: We call it highscool until age 18.

Stranger: we had the choice of 4 subjects

You: And faculty after 18.

Stranger: and i choose these

You: You must live in a Western country.

You: If your educational system allowed you to choose.

Stranger: we call it secondary school 11-16 college 16-18 university 18+

Stranger: indeed

You: I see.

Stranger: you didnt get to choose after highschool

Stranger: ?

You: I did.

You: There's general school until 15.

You: Highschool from 15 to 18.

You: And faculty/university after.

Stranger: closeish to ours then

You: There are predefined profiles that you can choose in highschool.

Stranger: whats applied physics like?

You: Applied Physics is quite a nice domain.

Stranger: what are the things you do?

Stranger: just a general idea please

You: Somewhat opposed to Theoretical Physics but intertwined with it nonetheless.

You: Well...

You: I study all Physics.

You: Starting from Mechanics.

Stranger: so its not "what would happen if i was going near the speed of light with a mirror infront of myself/threw a rock/shined a light"

You: Thermodynamics, Electricity and Magnetism, Statistical Physics, Quantum Physics, Nuclear Physics etc...

Stranger: cool

Stranger: i plan to do physics at university

You: Relativity is only a small part of Physics.

Stranger: i know it is

Stranger: im just saying

Stranger: as an example

You: We don;t really deal with it extensively.

Stranger: i cant give an example to everything

You: But it's useful for astrophysics yeah.

Stranger: it doesnt really go with the applied bit does it.

You: Well relativity is really pronounced at large scales and high speeds.

You: Of course there is need for it.

Stranger: i know

Stranger: but ..

Stranger: oh never mind

You: When dealing with subatomic Physics, involving relativistic speeds.

You: Our focus is on engineering.

You: Optoelectronics, lasers, environmental Phnysics...

Stranger: i know it is needed , but at the moment it isnt really relivent to alot of people in the way engineering and other things are

You: Yes, it's not that practical to use in real life situations.

Stranger: unlesss for some reason we go to near speeds of light

You: Though some parts of it are used in space travel and even airport traffic for example.

Stranger: then im not sure it really matters, because we will see anyway

Stranger: if we die

Stranger: airport traffic

You: Like non-euclidian mathematics.

You: Yes.

Stranger: relativity?

Stranger: whats euclidian?

You: It's hard to explain.

You: Euclid was a mathematician who proposed a few geometrical axioms.

You: In the hypothesis that space is "straight".

You: But in reality, space is curved around objects with large masses, as relativity shows.

Stranger: i see what you mean now

You: And for example, in a euclidian space, two parallel lines never meet when they are extended to infinity.

Stranger: aha

Stranger: and they do?

You: Well in reality, there is no such thing as line parallelism because there is no such thing as a straight ine.

Stranger: well yeah i know. but at basic levels

You: The shortest distance between two objects is not a line, but a curve.

Stranger: a curve?

You: And this becomes more pregnant as we approach large masses, or a higher curvature of space.

Stranger: is it?

Stranger: can you explain or is too detailed?

You: Yes, but at our scale, we can safely assume it's a line.

You: Well, think of 2 points on the surface of a sphere.

Stranger: is that at large scale or small scale?

You: And try to connect them with a straight line.

Stranger: because we dont know the shape of the universe?

You: You will see that the line forming a cord in a circle that cuts that transverses the sphere is actually longer than the circumference of the arc between the points.

Stranger: sorry im just trying to simplyfy it to my terms, because you are a hell of alot smarter than i am

You: A circle that transverses the sphere.

You: Sorry.

You: As in it cuts the sphere in two.

Stranger: no prob

Stranger: a hah...

You: So you would travel a shorter distance if you were to just walk along that arc.

You: Than to go in a straight line.

Stranger: i understand now

You: This is what non-euclidian geometry is all about.

Stranger: so does this apply to large scale?

Stranger: or small?

You: Yes, of course.

You: At large scales, where curvature is greater.

You: Think of the curvature of Earth.

You: Or any other large mass object.

Stranger: but if were in space and just say we wanted to go to another point a great distance apart

Stranger: would we know which way would be the best?

You: This is due to the fact that, as Einstein predicted and then showed, an object with mass creates a hole in the space-time fabric.

Stranger: fastest*

You: Well not really a hole, but just bends it, you know what I mean.

Stranger: i know

Stranger: like an example is a sheet held out

Stranger: with balls placed in

You: Yes, or a piece of elastic fib er.

Stranger: is that sort of a good example?

You: The elastic fiber is better.

Stranger: oh well

You: Because gravity is a force of attraction.

Stranger: its an elastic sheet

You: So when the object, say a star, becomes lighter, gravity starts to push on it.

You: And if the push of the gravity is great enough, it can "Gravitationally collapse" it.

You: And create what is called a blackhole.

Stranger: :O

Stranger: so what is in the centre of a black hole?

Stranger: just condensed matter

You: No one actually knows.

You: Yes, it seems that blackholes even emit radiation.

You: As Hawking showed it, I think.

Your conversational partner has disconnected.

I rest my case

Back

Am avut niste dificultati tehnice privind contul meu pe gmail. Din fericire s-au rezolvat si am reusit sa reintru pe blog. Voi fi putin ocupat cu scoala in perioada asta dar mai arunc cate-o fila si pe aici din cand in cand.

Tabel de etalonare

Accept the mystery

Ieri am terminat de vazut "A Serious Man", un film de fratii Coen. Ce m-a atras initial a fost ideea filmului, un profesor evreu de fizica are o criza de viata. Am fost oarecum dezamagit de incertitudinile care apareau in film, multe lucruri se termina brusc, inclusiv finalul. Si pare ca nimic nu are vreun... sens. Cauze necunoscute, un Univers aleator sau un Dumnezeu razbunator ? Cred ca asta e si ideea filmului. Incertitudinea; poate fi oricare din aceste lucruri. De fapt, sunt destul de convins ca despre asta e vorba, de-a lungul filmului exista indicii: pisica lui Schrodinger, demonstratia principiului lui Heisenberg pe care le-o face studentilor, dilema de la inceputul filmului (daca vizitatorul e sau nu un demon), goana sa dupa raspunsuri la cauzele care i-au destramat casnicia (rabinii), confruntarile sale morale ridicate de problema trecerii studentului strain... E o diferenta intre incertitudine si caracter aleatoriu. Mintile noastre sunt in contradictie cu universul din punctul asta de vedere. Starea universului tinde catre haos, catre o dezordine cat mai mare: daca reusesti sa creezi ordine intr-o parte (sa reduci entropia unui sistem local), aceasta ordine este compensata de cresterea entropiei in alta parte si astfel echilibrul se pastreaza. Dar mintea umana e diferita, ea tinde catre ordine, catre indepartarea haosului, a confuziilor, catre gasirea de raspunsuri. Suntem parca presetati sa fim diferiti de "ordinea fireasca a lucrurilor". Si aceasta impotrivire duce doar la crearea unui haos si mai mare intocmai cum un sistem care se indreapta spre echilibru termodinamic creeaza dezordine (teoria racirii Universului), fiindca de fapt tot ce incercam sa facem e sa ajungem la un echilibru cu noi insusi, cu lumea din jur, sa ne solutionam problemele... sa fim fericiti.
Eram confuz de ce acest film fusese nominalizat la Oscar, finalul filmului m-a lasat cu gura pe jumatate cascata pe jumatate pe cale sa scoata o injuratura fiindca nu intelegeam. Asa ca, m-am culcat. Astazi m-am trezit si am realizat ca filmul imi prezenta subtil toate aspectele prin care trec. Era mai mult despre mine. De ce nu pot sti ce gandesc altii ? De ce nu pot sti ce vreau ? De ce mi se intampla toate rahaturile cand eu incerc sa fiu ok cu toata lumea ? E o ironie a sortii sau doar o coincidenta ? De fapt, e un film despre vietile tuturor. Nu e nicio confuzie in film, el nu ofera solutii, el doar prezinta si ne lasa sa interpretam, sa ne intrebam. Cam ca si in viata. Viata se deruleaza indiferent de cate raspunsuri gasesti, si adesea un raspuns naste mai multe confuzii si intrebari. Schimbarea este singura constanta in viata. Suntem obisnuiti sa intelegem ca atunci cand se intampla ceva, trebuie sa existe o cauza determinabila care a dus la acel lucru, si daca identificam acea cauza, putem solutiona problema, si putem preveni aparitia ei in viitor. Asta nu e mereu adevarat. Daca ar fi asa, ne-am putea gandi ca am putea prezice viitorul, dupa spusele lui Lagrange, daca am avea suficienta putere de calcul pentru a vedea cum evolueaza in timp sistemele, cunoscand starea la un moment initial. Dar natura are acest mecanism, acest copyright pe care nu-l poti "crackui". Incertitudinea. Nu poti sti un lucru cu precizie 100%. Dar asta nu inseamna ca "totul e relativ" (adesea inteles ca "totul e subiectiv" - si atunci lumea crede ca in pofida acestui fals truism poate sa afirme orice si sa se bazeze pe relativitatea adevarului ca argument in sustinerea prostiei pe care a spus-o). Inseamna doar ca exista o limita a ceea ce poti acoperi la un moment dat, o limita peste care nu poti sa treci.
Per total, pot spune ca filmul a fost "meh". Mi-a reamintit de aceasta limita si mi-a sugerat sa mai tai din acceleratie. In fine, cred ca ma intorc la (meta)materialele mele.