/sci/ - Science & Math

>>15623623
So what is responsible for the order of the universe?

>>15623623
I've been told the universe is infinite in both time and space; that it is expanding in some places, and contracting in others.

>>15623605
What creates order then?

>>15623537
Forgot image
Captcha k420n

>>15623537
Why are they useless? Also how do we know they are going to evaporate? I've been told we don't have any evidence of Hawking radiation...

>A 2010 analysis of entropy states, "The entropy of a general gravitational field is still not known", and "gravitational entropy is difficult to quantify." The analysis considers several possible assumptions that would be needed for estimates and suggests that the observable universe has more entropy than previously thought. This is because the analysis concludes that supermassive black holes are the largest contributor.[31] Lee Smolin goes further: "It has long been known that gravity is important for keeping the universe out of thermal equilibrium. Gravitationally bound systems have negative specific heat—that is, the velocities of their components increase when energy is removed. ... Such a system does not evolve toward a homogeneous equilibrium state. Instead it becomes increasingly structured and heterogeneous as it fragments into subsystems."[32] This point of view is also supported by the fact of a recent[when?] experimental discovery of a stable non-equilibrium steady state in a relatively simple closed system. It should be expected that an isolated system fragmented into subsystems does not necessarily come to thermodynamic equilibrium and remain in non-equilibrium steady state. Entropy will be transmitted from one subsystem to another, but its production will be zero, which does not contradict the second law of thermodynamics.[33][34]

>>15623505
What would you call the tendency that those things share?

This is what got me thinking, without knowing too much
>Max Planck wrote that the phrase "entropy of the universe" has no meaning because it admits of no accurate definition.[23][24] In 2008, Walter Grandy wrote: "It is rather presumptuous to speak of the entropy of a universe about which we still understand so little, and we wonder how one might define thermodynamic entropy for a universe and its major constituents that have never been in equilibrium in their entire existence."[25] According to Tisza: "If an isolated system is not in equilibrium, we cannot associate an entropy with it."[26] Buchdahl writes of "the entirely unjustifiable assumption that the universe can be treated as a closed thermodynamic system".[27] According to Gallavotti: "... there is no universally accepted notion of entropy for systems out of equilibrium, even when in a stationary state."[28] Discussing the question of entropy for non-equilibrium states in general, Lieb and Yngvason express their opinion as follows: "Despite the fact that most physicists believe in such a nonequilibrium entropy, it has so far proved impossible to define it in a clearly satisfactory way."[29] In Landsberg's opinion: "The third misconception is that thermodynamics, and in particular, the concept of entropy, can without further enquiry be applied to the whole universe. ... These questions have a certain fascination, but the answers are speculations."[30]

>>15623493
What isn't entropy?

>>15623488
Please be kind, this is supposed to be a blue board.

There isn't? Then why is there so much apparent observed order?

>>15623468
Gravity does more then make objects collide, doesn't it?

>>15623465
Well I've been told black holes are the largest sources of entropy, but I don't really understand why.

>>15623457
>>15623458
So what do we cann the tendancy of things to become ordered?

>>15623442
But matter does become more ordered. Is gravity not responsible for this?

>>15623417
The tendency of things to become more ordered? I suppose.

>>15623417
Is it? My bad, what's gravitational entropy then?

>>15623408
The tendancy of things to come together.

mean there could be an eternal universe with infinite complexity?

Whats up with all the IRL pedo-posting?
>>12649495
>>12646126
>>12649539
The anime-spamming coomers are one thing, but this is a whole different level of glow.

>>12648540
>virgin trickle energy from Big Sun
vs
>chad make your own sun in the backyard

>>12647355
>math at higher levels isn't just picture books
It is when I'm thinking about it. But then I return to the normie-world where I gotta explain results to unintuitives so I use the best language available to me in the hopes of convening the result to the normies: standard math notation and proofs. They won't understand my though process but they can follow normie math proofs.

>>12647530
/thread

>>12644872
>Phone on, birds flip out and start pecking the walls of their cage trying to escape. Phone off = birds kalm, peacefully chirping to each other and eating. It is not like the effect is instant or anything, seems to take about 10-20mins to ramp up and disturb the birds.
That's a repeatable experiment. Good enough for science. If it's bad enough for birds, it's bad enough for you.