David Gross: Quantum Field Theory - Past Present Future

Invited talk at the Conference in Honour of the 90th Birthday of Freeman Dyson, Institute of Advanced Studies, Nanyang Technological University, Singapore, 26-29 August 2013
www.ntu.edu.sg/ias/upcomingeve...

[@robertschlesinger1342]

Interesting and worthwhile video.

[@kamilziemian995]

Very simple and at the same valuable lecture.

[@lingxiaoxu8829]

Nice lecture, never seen the topic being explained so clearly!

[@QingjiangPan]

honestly, the way he talks on this interesting subject made me feel sleepy

[@nitroyetevn]

(watch at 1.25 speed)

[@Dendronish]

Can't thank you enough.

[@m0ligor]

A nice praise to F. Dyson great contributions to physics (with a curious remark about AdS bobbing in the middle!).

[@SeanMauer]

Seems to me that what we experience as our universe is derived from activity in extra-dimensional realities.

[@enlongchiou]

Mass gap Mp/Mpl = 1.3*10^19 = A, proton radius 8.8*10^-16 meter equal to g(p)(A^2*g)time 4.18(4*pi/3) time Mpl 1.67*10^-27 kg divided by c^2, form micro black hole of proton, g(p) is ratio of strong to gravity force.(g,c for 6.67*10^-11,299792458)

[@tomasarce6435]

I have never seem this explained so well. Brabo! Now what the hell do I do with it. :-)

[@Hythloday71]

Wow. Compelling ideas pointing to string theory. Gauge Theories, Lattice Gauge Theories, Perturbation Theory ... got to get me some understanding of these it seems ;o)

[@Fransamsterdam]

What's that chair doing there?

[@muttleycrew]

There’s an invisible man sitting on it

[@chloeagnew1]

I have a feeling that we human beings still do not fully understand QFT. We still cannot see the real face of QFT. In most cases, we can only do it perturbatively. However, sometimes we can obtain fundamental results from perturbation calculations. It might be possible that one day the mathematical description of QFT is totally different, where you don't even need to introduce renormalization. Perhaps we don't even need a Lagrangian for QFT. Peskin's textbook may not be the whole story. This is just my personal feelings. I may be wrong.

[@scienceisall2632]

Hmmm

[@neelakandankoodallur4962]

Most speakers do not talk to the audience . They look at the blackboard most of the time, making the talk extremely boring.

[@charlesbrightman4237]

For me: "Space" is the pure energy unit itself. Wherever space is, energy is. Wherever energy is, space is. "Time" is the flow of that energy.

[@RichardAlsenz]

Does anyone do science any more? If you can't measure it and/or it is not repeatable call it mathematics and as Dirac suggested don't waste your time move on and find a simple scientific foundation.

[@fabuloso3635]

5:30 dude was high af

[@kosterix123]

i dont understand a thing he says

[@impCaesarAvg]

Space and time do not exist.

[@impCaesarAvg]

***** You can make that comment, and I can understand it, because our brains use the concepts of space and time to organize our experience. But space and time don't exist. Luckily, some theories built on these concepts are in rough accord with the some behavior of the universe, so these concepts are useful. When you try to extend them beyond quantum field theory and general relativity, they start to fail.

[@amdismat1]

Zero universe

[@lsbrother]

where and when do space and time not exist?

[@Ziplock9000]

Boring presentation

[@amdismat1]

x2 playback helps all these videos