Prof. Carlo Rovelli - „What is time?”

Рет қаралды 32,757

7 жыл бұрын

W dniu 6 lipca 2017 r. na Wydziale Fizyki UW prof. Carlo Rovelli wygłosił wykład zatytułowany „What is time?”. Więcej informacji:
zapytajfizyka.fuw.edu.pl/wykl...

Пікірлер: 25

@lucapoletti6982 6 жыл бұрын

His books are gold

@alejandrarodriguezsanchez6667 6 жыл бұрын

yes indeed!!

@robbie_ 5 жыл бұрын

Very interesting. Thanks for sharing.

@BennyKleykens 6 жыл бұрын

The icecube melting isn't the best example because it neglects that the icecubes would never form by themselves in the first place. Put water in a glass, let it freeze, let it melt, let it freeze ... As long as it's in the glass there's no increase in entropy. Burn wood, can't unburn it, but forming wood requires a tree to grow it so obviously there's no easy way back without that 'growing'. Entrophy does increase but the examples are often not very convincing IMHO.

@Tom_Quixote 5 жыл бұрын

"I have pictures of myself as young, I don't have pictures of me as old" - professor with white hair

@gregorius790 7 жыл бұрын

Ech, przydałyby się napisy PL.

@jtinalexandria 6 жыл бұрын

If time slows down to a stop in a black hole, then what's the other extreme? Where in the universe does time pass most quickly, and how quickly is that?

@priyanthawijayatunga624 4 жыл бұрын

Definition of time: if things happen then there is time, ie., if things are not happening then there is no time. Things stop happening means even our minds stops

@new-knowledge8040 6 жыл бұрын

Think of all matter being constantly in motion within a 4d structure called Space-Time, and that the magnitude of this constant motion within space-time is the same as the magnitude of motion of which light has as it moves across space. Analyze the outcome of this setting, and within minutes you will fully understand Einstein's theory of Special Relativity(SR), and you will also be able to independently derive all of the SR mathematical equations within mere minutes, including the Lorentz transformation equations.

@new-knowledge8040 6 жыл бұрын

As seen within my YT videos, the method that I used to eventually derive the SR equations, was unique due to me having no previous physics education at all. It all started when I noticed something odd about "motion", something that no one else ever seemed to have made a point of.

@new-knowledge8040 6 жыл бұрын

Well I was tickled pink with having come up with the SR equations. My parents pulled me out of school before I had a chance to acquire any physics education (Long story). After that, I ended up in a semi-coma after experiencing 8 years of severe hypoglycemia. Once finding the cause and eliminating it, it took me another 8 miserable hell like years to relearn things like, which is my left hand and which is my right hand, which hand holds the knife and which hand holds the fork, to be able to recognize the quantities of objects that were greater in number than 3, to be able to see words as words rather than having to read them letter by letter, to be able to read sentences without having to read them over and over again to grasp any meaning from them. To be able to spell my brothers name again. For auto visual focus to work again. For the each iris to open again under dark conditions. To be able to tell if water is hot or cold. And the list goes on and on. So to independently discover SR after all of this hell, is pretty damn good if I may say. The only main thing I never got around to relearning, was writing, although I can print.

@jacoblampmatthiessen9862 6 жыл бұрын

Could have been interesting if he had delved into a broader discussion on causality instead of just describing why the concept of time variables is problematic.

@bballgru407 Жыл бұрын

Wait, time is slower in higher altitude. It's a fact, it can't be checked, but it is a fact. Then how do we know that it is a fact if it can't be checked? It may be a fact (one brother may look and feel older) because environment is different, but if they were both born at some point in time or the difference was for example 10 min between birth, it is not possible that now difference in their birth is 20 min simply because one was in the mountains.

@jimmanis5084 6 жыл бұрын

Bob Dylan explained this in the 60s. "Time passes slowly up here in the mountains..."

@andreasargubi-wollesen5203 6 жыл бұрын

except it is the other way around ;) no offense

@jimmanis5084 6 жыл бұрын

None taken.

@corradoameli2790 6 жыл бұрын

If you live in the mountains, time goes faster, in fact you get older faster. Assuming that you perceive the flowing of time at the same way everywhere, you have more "time" to spend and possibly to get bored by living far away from the lowlands! Thus, I think Dylan was right, even if I don't think he was trying to methaporize this concept :D

@BeatriceGM 6 жыл бұрын

Oh le joli lapsus "on se rappelle du futur" !!! ;) (at 9'08")

@stefans.5043 5 жыл бұрын

Why can i make a picture in the past and not the future? Seriously, how smart are you?

@Mirka_1505 6 жыл бұрын

PROSIMY O NAPISY W JĘZYKU POLSKIM ...

@oriomenoni7651 5 жыл бұрын

The time is subjective to everyone of us, but it is not to the whole of us. To me, who was born in 1961, Hitler and World War 2 never existed, and the things that will happen after my death, also will never exist... But to my mother and my father, who generated me, Hitler and WW2 did actually exist, and they were real in a way that if one of them got killed during the war (and there have been moments in which this possibility was really high, even percentually higher than the survival), I would not be here. What does that mean? It means that if something, that to me never existed, had the potential to influence my existence to a point that it would deny it, and make it not happen, then there is proof, in my opinion, that time is not a subjective entity, it is not something that exist because of the way our brains work. It proves instead that time is a vector that carries the matter through a series of state changes, and it does that regardless of our existence and of our consciousness of it.

@ronividdy 6 жыл бұрын

Just do the material, please avoid extraneous chatter.

@gupianauka9906 7 жыл бұрын

Fajne, ale dla kogoś kto nie jest fizykiem powstaje bariera, nawet jeśli świetnie zna angielski.

@djordjesimic3581 5 жыл бұрын

i'm sorry to break it down for you...but even he doesn't seem, not to understand, but to believe what he teaches about...

@stanleykubrick8786 5 жыл бұрын

What is climate change? It’s time that these so-called scientists got serious about the state of affairs in the world that we live in. Can Mr. Ravioli comment on what caused the World Trade Centre buildings to collapse to the ground??