The Science of Time – Carlo Rovelli

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Of course alex did an episode with this amazing person! 🎉

please get Julian Barbour on to discuss Machian relational motion, quite interesting ideas.

We should have clocks go faster during the day in winter, slower at night. 😂

I think there are three dimensions of spacetime, not four dimensions (three of space and one of time). It’s possible to go back and forth in any spatial direction, but the same isn’t possible in the dimensions of spacetime. When you go to the left and then come back, you return to the same place in space, but you’re in a new place in spacetime.

One day, while looking at my wall watch, I wondered: what if three independent fundamental theories suggest that the “form” of matter (atoms) and the “form” of time—or its emergence—are rooted in the same underlying structure: geometric, vibrational, or algebraic? Then perhaps the atom and time are inseparable expressions of a single entity—a discrete, self-organizing foundation of reality.🤔 When we ponder the nature of time, how often do we glance at a simple wall clock? Its face, with numbers in their eternal circle, is perhaps the first and most profound model of time we ever create.

16:00 I don’t know if the Planck length/time is a literal discrete value, it’s just where our theories break down, and where the universe starts refusing to examine itself.

You can read it like spacetime is literally quantized, like squares on a chess board, or you can read it that we just don’t know what’s going on down there, and can’t know, because of the energies required to probe it.

You’d make a black hole trying to examine these quantities, but that doesn’t mean there’s nothing there waiting to be examined. Unknowable, sure, but I can’t examine things outside the observable universe yet that doesn’t mean things don’t exist.

Im actually agnostic about this, both views make sense to me. Just not sure we can be confident about either.

We are being pulled forward in the future time dimensional direction just like gravity pulls us to Earth, except it’s pulling so hard that you can slow your descent but you cannot overcome it, just like a black hole; in this case the event horizon is an object of infinite time, thus drawing all other times to it, the time after time, the cold even separation and death of all things.

Ate a mushroom and was pondering time…

i think the simplest analogy for time and relativity is just to look at water. if you say ‘what height is the water’, you can give a general answer from an outside perspective. but depending on which area you’re looking at, the exact height of the water can be very different. it also makes it easier to understand black holes if you imagine them as a waterfall.

the devil is anti nato

If you take a shot every time you hear the word "Time" you get to watch it twice.

Fascinating conversation!

If gravity is stronger (aka the slowing down of time is more pronounced) the closer you get to more massive objects; if we lived on a celestial body twice as massive as Earth would we live for twice as long and vice versa? 🤔

Granted mass is relevant rather than size but assuming simmilar density of all three bodies would we have a shorter lifespan on Mars and a longer lifespan on Ganymede relative to here on Earth? 🤔