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A treat for the Physicists

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Bikerman
Here is a special treat for the physicists out there. A link to a recent lecture by Roger Penrose on cosmic topology, black holes and, centrally, his thoughts about pre-BigBang physics.
The lecture is in audio with diagrams and drawings linked to the audio...all in all this is a superb presentation and, to add the cherry to the top, it's completely gratis thanks to the folk at Cambridge Uni

http://www.newton.cam.ac.uk/webseminars/pg+ws/2005/gmr/gmrw04/1107/penrose/index.html

Enjoy..

Regards
Chris
minsusales
sooooooooooooooooooooooooooooooooooooo cool pretty weird but cool Razz
ninjakannon
Thanks for that, Bikerman. I listened to the whole thing and it was very interesting although some of it was way too advanced for me, as good at science as I am. Razz
It explained further some of the things that I already know and told me a lot that I didn't; doubtless I'll have forgotton most of it by tomorrow though.
Lennon
Very plausible.

Note that this cannot be accepted as a scientific principle, ever, because it is beyond the analysis of the scientific method. We cannot test the theory.

I'll tell you why you like it so much.

You love theories of the bigger picture, using logical arguements like observations in nature, fundamental laws of nature etc. You have a psychological satisfaction with scientific knowledge.

Back to the topic, this guy is very hard to listen to, he sounds very confused with "emm" all the time, depending entirely on his drawings.

Again, I still think there are three possibilities, a cyclic universe, a Stephen Hawking universe that emerged from a quantum foam, or the more traditional big bang origin at singularity.

All three have logical flaws, breaking one or more fundamental laws of nature like energy conservation or the 2nd law of thermodynamics or quantum-gravity collapse.
Bikerman
Lennon wrote:
Very plausible.

Note that this cannot be accepted as a scientific principle, ever, because it is beyond the analysis of the scientific method. We cannot test the theory.

Hmm.... I know what you are trying to say - it must remain a hypothesis until observational or experimental data can be designed to refute it. At that point it can become a theory.
Quote:

I'll tell you why you like it so much.

You love theories of the bigger picture, using logical arguements like observations in nature, fundamental laws of nature etc. You have a psychological satisfaction with scientific knowledge.

Err....true, but that's science....
Quote:

Back to the topic, this guy is very hard to listen to, he sounds very confused with "emm" all the time, depending entirely on his drawings.

I like his style - like Feynman he does lots of err'ing and umm'ing because he's trying to float his head around deep concepts on the fly...it's not easy. Besides which this is the great Roger Penrose - he's earned the right to talk backwards in japanese slang if he wants to Smile
Quote:

Again, I still think there are three possibilities, a cyclic universe, a Stephen Hawking universe that emerged from a quantum foam, or the more traditional big bang origin at singularity.

Ahh...so you support early inflationary epoch to explain homgenesis then ?
How do you square the problems that are thrown up by that ?
Quote:

All three have logical flaws, breaking one or more fundamental laws of nature like energy conservation or the 2nd law of thermodynamics or quantum-gravity collapse.


I'm not sure what you refer to by the quantum gravity collapse law...can you elaborate ?
the1991
Nice link! Thanks, this is really interesting.
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