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Does Quantum Physics Make Sense Yet? - Jim Al-Khalili

Alex O'Connor

584,074 views

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VIDEO NOTES

Jim Al-Khalili is an Iraqi-British theoretical physicist and science populariser. He is professor of theoretical physics and chair in the public engagement in science at the University of Surrey.

TIMESTAMPS

0:00 - The Double Slit Experiment
3:43 - Interpretations of Quantum Mechanics
15:14 - Why is Quantum Mechanics So Weird?
22:15 - Do Things Just Work Differently at a Quantum Level?
27:34 - What is Time at a Quantum Level?
32:54 - What on Earth is Time?
37:04 - Does the Past Exist?
45:31 - Does Time Have a Direction?
56:16 - Probability in Quantum Mechanics
01:01:35 - Could Time Be an Emergent Property of the Universe

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20 Comments

@CosmicSkeptic Creator 1 year ago Pinned

@djbanizza 1 year ago

Planck time = the interval between two ads on YouTube
Planck length = the dimensions of the ad close button

@TwoDudesPhilosophy 1 year ago

Quantum physics is both understood and not understood at the same time.

@OhPuree42 1 year ago

I'm a physicist working on quantum foundations and I am impressed of the quality of this interview. There is too much bad science communication on youtube

@streglof 1 year ago

Britain's best science communicator. Love his documentaries.

@kindawarm8624 1 year ago

41:00 both of them appreciating/knowing mac miller is such a welcome surprise to me

@Deode-d4h 1 year ago

Gosh this has to be one of the best interviews Alex has done. If this was 2 hours longer, I wouldn't be opposed to it. I was just enraptured listening to this even though I am struggling to keep up what exactly Jim Al-Khalili is saying at times. But it was all still so fascinating.

@mattytheenigma 4 months ago

Two of my favorite people, having an honest conversation about the building blocks of our world. We are so lucky.

@inviz88 1 year ago

Jim is such an amazing science communicator. Great episode.

@XanderKarr 1 year ago

When Alex talked about feeling the sensation of moving his hand in space, but struggling to feel his movement through time, it reminded me of highschool physics when my teacher explained that you cannot feel speed, only acceleration (and deceleration). I wonder if the same is happening with time. Just as we don’t feel the constant rotation of the earth beneath our feet, or the orbit of the earth around the sun, perhaps we can’t feel the movement through time as it remains relatively steady.

@Wol747 1 year ago

This sort of chat makes me so grateful to be alive at this time.

@AcidOllie 1 year ago

I've always loved listening to and watching Jim Al-Khalilli. I still enjoy watching all his old stuff that pops up now and then. Great interview guys.

@kushaltiwari3668 1 year ago

You are spoiling us alex with these many uploads.

@andreaaveni6354 1 year ago

The quote about time is not from Aristotle but from St Augustine.

@Devious_Dave 1 year ago

Jim answered my (online) question recently - I'm still a bit giggly about it. 🙂

@wzywg 1 year ago (edited)

It's interesting to contrast this with mathematical proofs. No scientific proof can ever be as axiomatic as mathematic proofs. And mathematicians only wonder why, not how, as a result. No-one seriously investigates why prime numbers are so strange, just how. The behaviour of numbers is just accepted, as a brute force. Much of these discussion points in this video are focused on why we just can't reconcile the different ways we explain the Universe.

The Universe just get's on with being, despite our hubristic assumption we can comprehend it.

@LeonMRr 1 year ago (edited)

Its always a pleasant surprise to see Alex talking about my area of expertise. My two cents about how to define time is that it is fundamentally relational, you can't talk about an event without relating it to other events (even if these other events are, for example, the detection and "measurement" of that event) and QM, GR and thermodynamics as well fundamentally talk about time as a relationship between events, the problem is that GR and QM more specifically have completely clashing definitions of how that relationship happens, and that is at the core of their incompatibility, that is BTW what the (unsolvable) wheeler-dewitt equation tries to describe.

@happym5717 1 year ago

Alex did a great job at interviewing and showing a great deal of prior learning to be able to engage sufficiently with the physics. Jim was clearly wanting to talk more Quantum theory but it's hard to always get that stuff flowing for a wider audience.
Great interview