Smolin video LQG online course

  • #61
Perhaps it's noteworthy that he goes through all of this in greater detail in later lectures, (7, 8, 9) so there probably is little point in discussing it into great a detail. Lecture 2 is still mainly motivational.
 
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  • #62
  • #63
I got to watch lecture one and half of lecture two, in careful detail. I actually tried to transcribe what Smolin said! Is that a hockey stick on the table in front of him? I made a rude comment about hockey players once and would have to retract it if Smolin is a hockey player. I wish he had better handwriting.

However, I now find that I cannot get into the website. My browser says it is unavailable. Anyone else having this problem?

Thanks for the great link, at least while it lasted.

R.
 
  • #64
Streaming Presentations Unavailable Due To Maintenance
Presentations will be unavailable due to standard maintenance until Friday February 23, 2006 at 10am.
From the main perimeter site.
 
  • #65
Thanks! I am relieved. Now, what about that hockey stick? R
 
  • #66
rtharbaugh1 said:
However, I now find that I cannot get into the website. My browser says it is unavailable. Anyone else having this problem?
I'm still having trouble, and it's Saturday morning. Is the site working yet? Thanks.
 
  • #67
Mike2 said:
I'm still having trouble, and it's Saturday morning. Is the site working yet? Thanks.

I saw somewhere that it would be down til Monday. AFAIK it is still down. Personally I will try again Monday. Hope it's up by then.
 
  • #68
Just to let everybody know, I will be away from the computer from tomorrow morning February 25 till the evening of Monday March 6. So I won't be able to view Lectures 3 and up until that week.

See you all then.
 
  • #69
selfAdjoint said:
Just to let everybody know, I will be away from the computer from tomorrow morning February 25 till the evening of Monday March 6. So I won't be able to view Lectures 3 and up until that week.

See you all then.

sounds like a trip----hopefully to somewhere warmer than the upper midwest Great Lakes region

to make a general request----last time I checked Perimeter streamer had not put up Lectures 11 and 12
and the site was still down for maintenance

(anyway that is what my computer thinks----it can't connect)

If anyone does try it, and happens to connect, please post the news here!
 
  • #70
marcus said:
sounds like a trip----hopefully to somewhere warmer than the upper midwest Great Lakes region



To my son's house, to spend the week and attend the christening of his new daughter Elizabeth, born if you recall December 21 2005. He lives in a far Northern suburb of Chicago; the temp here is in the 20's (F), which is acceptible if not comfortable to a Wisconsin Cheesehead. We describe a day as "beautiful" not by the temperature but by whether it is sunny or not. That must seem counterintuitive out in La La Land.:biggrin:

When I was here over the Winter holidays, he didn't have a firewall on his new computer, and asked me not to log on to the net, for fear of viruses. Now he has one, so I can surf, but I still won't have an opportunity to watch the Smolin videos.
 
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  • #71
Hi guys, do the LQG videos work for you all? Or do you have currently problems too?

it doesn't for me, after the information bar is displaying 'Transitioning' for a few seconds, it goes back to ready, meaning it stopped (play button available, pause and stop not)

edit:

just discovered something interesting:
none of the videos is working for me, but when i right-click on the video window and choose error details, i get this:
WMP cannot play the file because the specified protocol is not supported. If you typed in the Open Url dialog box, try using a different transport protocol (for example, "mms:")

Why doesn't my windows media player (10, on windows xp) support the used protocol? It should be one that it's supporting, otherwise Internet Explorer wouldn't load the WMP ActiveX control (and i can see from the URL, that media player 'WM7' is specified)
 
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  • #72
beta3 said:
Hi guys, do the LQG videos work for you all? Or do you have currently problems too?
...

they currently don't work for me. I just tried.
this is when I expected things to be back up (Monday 27 Feb)
after what they said would be routine maintenance.
but at least for my system----with which I earlier didnt have trouble getting them---they arent available

I don't know how to interpret----I think the whole Perimeter streaming media facility is not working.
I don't think it is special to me or to the Smolin lectures.
but I could be wrong.

If anybody finds something different, or gets a rise out of them, please post and let the rest of us know.

About the rest of the Perimeter site----the regular stuff not including the streaming video lectures----everything seems to be business as usual, I have no problems
 
  • #73
A day for disappointments, perhaps. FQX has, as promised, posted on their site a call for research proposals. Sadly, from my standpoint, they seem to be calling for academic professionals who may be tempted to do some work that is too edgy for DOE or other usual funding sources, but they are not encouraging people outside the academic establishment who might like to get a chance to bat, for once. Money and honors, as usual, flow toward those who already have them, not to those who may have some merit but go unrecognised. I had hoped for something else, from the original announcements.

Anyway, it may be a small alternative entertainment for those of us who are locked out of the Mediasite Presentation Catalog to visit FQX at:

http://www.fqxi.org/index.html

R
 
  • #74
thanks Richard, I followed your link and found food for thought:
=====quote=====
Relevance: Proposals should be topical, foundational, and unconventional.

Topical: This Inaugural Request for Proposals is limited to research in physics (mainly quantum physics, high energy "fundamental" physics, and gravity), cosmology (mainly of the early universe) and closely related fields (such as astrophysics, astrobiology, biophysics, mathematics, complexity and emergence, and philosophy of physics), insofar as the research bears directly on questions in physics or cosmology. Although the distribution of funds across subject areas will be driven in large part by the quality of proposals received, a goal of the review process will be to fund diverse research topics that span the small and the large, and range from the elementary to the complex.

Foundational: This Inaugural Request for Proposals is limited to research with potentially significant and broad implications for our understanding of the deep or "ultimate" nature of reality.

Unconventional: This Inaugural Request for Proposals is intended to fill a gap, not a shortfall, in conventional funding. We wish to enable research that, because of its speculative, non-mainstream, or high-risk nature, would otherwise go unperformed due to lack of available monies. Thus, although there will be inevitable overlaps, an otherwise scientifically rigorous proposal that is a good candidate for an FQXi will generally not be a good candidate for funding by the NSF, DOE, etc. - and vice versa.

...
...

INITIAL PROPOSAL - DUE April 2, 2006 - Must include:
A 300 - 500 word summary of the project, explicitly addressing why it is topical, foundational and unconventional
A draft budget description not exceeding 200 words, including an approximate total cost and explanation of how funds would be spent
A Curriculum Vitae for the Principal Investigator, in PDF format, including:
Education and employment history
Five previous publications relevant to the proposed research, and five additional representative publications
Full publication list
======endquote======

I won't comment on the issue that you raised about restriction to Academia.

Whether or not that restriction makes sense (especially for their maiden venture) there are already quite a lot of people in Academia who have UNCONVENTIONAL ideas they want to work on that are not likely to get funded by either DOE or NSF.

By saying "non-mainstream, high-risk, speculative" they are already inviting a lot of rather unconventional stuff.

In the US research community almost any non-string Quantum Gravity is unlikely to get DOE or NSF funding and for this reason it could be considered as high-risk to embark on non-string QG research.

There is a lot else besides. They could find themselves getting plenty of proposals submitted----that they then have to review and decide which ones to invite to the second round submissions.
 
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  • #75
marcus said:
they currently don't work for me. I just tried.
this is when I expected things to be back up (Monday 27 Feb)
The video is now working again. I just finished viewing part 3 in his intro to quantum gravity series. Cool.:cool:
 
  • #76
Mike2 said:
The video is now working again. I just finished viewing part 3 in his intro to quantum gravity series. Cool.:cool:

thanks for passing on the news, Mike
 
  • #77
marcus said:
thanks for passing on the news, Mike
I just viewed Part 6 of his series. It is only 53 minutes long when most others are an hour and a half. At the end of Part 6 Lee comments on how many in his audience appear tiered. I guess I don't feel so bad. After viewing it, I too could hardly keep my eyes open. Why...? It seems Lee Smolin makes quite liberal use of his previous results, and I felt unprepared for it. He should give some more explicit warning that these results will be used later. And it wouldn't hurt to give a one or two sentence review of where that result came from as well. (Take notes in parts 4 and 5) Overall I appreciate his efforts, he seems to be doing a fine job. Although I wish his writing was a little more legible.

Does he plan on writing a book on this stuff later?
 
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  • #78
Mike2 said:
Does he plan on writing a book on this stuff later?

bravo to you Mike!
I am glad you are going through them and are up to Lecture 6

I watched #11 yesterday and thought it was the most interesting yet

It is quite hard work for me, and i don't follow everything. Also I have to go over and watch some again. Each viewing a little more is understandable.

In one of the lectures, I forget which, Smolin referred to "a book I am writing"
but it wasnt clear that the book was a textbook parallel to this series of lectures. the main topic of the book might be something else tangential.

He is writing a book. But I can't guarantee that the book is an "Introduction to Quantum Gravity"----in the sense of this series of lectures.

For a while I couldn't find lectures 11 and 12 because when I clicked on "Introduction to QG" I got the TOC page for Lectures 1-10 only. Duh!
then I realized that this was just PAGE ONE of the TOC
and I had to click a box to get page two! Maybe i am the only one in the world who doesn't always notice these things.

Anyway, today I plan to watch #12, while my wife is out at a handcraft bookbinding class----she does beautiful leather and ornamental cloth re-bindings of books she likes which are falling apart----and I will turn up the volume and kick back and enjoy
 
  • #79
marcus said:
For a while I couldn't find lectures 11 and 12 because when I clicked on "Introduction to QG" I got the TOC page for Lectures 1-10 only. Duh!
then I realized that this was just PAGE ONE of the TOC
and I had to click a box to get page two! Maybe i am the only one in the world who doesn't always notice these things.
Haha thank you! I had not noticed that there was a page two.
 
  • #80
marcus said:
bravo to you Mike!
I am glad you are going through them and are up to Lecture 6

I watched #11 yesterday and thought it was the most interesting yet

It is quite hard work for me, and i don't follow everything. Also I have to go over and watch some again. Each viewing a little more is understandable.
I think I'm going to have to go back to part 2 and this time take notes. My overall perspective gets lost in the immediate details. The TOC page refers to Quantum Gravity, by Carlo Rovelli, Cambridge University Press 2005 as an accompanying text. I wonder if it includes all the wonderful math Lee shows on the board with Lagrangians, Hamiltonian, Poisson bracked, gauge fields, E and B fields, etc?

So marcus, what part does he start to actually quantize thing. Even up to part 6 he is still dealing classically. Thanks.
 
  • #81
I can't confirm it contains all the math in Lee Smolin's lectures, as I haven't seen them all, but Rovelli's book does include Lagrangians, Hamiltonians, Poission brackets, gauge fields, spin networks, etc. It is very very good, and I recommend it highly. In my opinion it's the best book on quantum gravity. There's also an early draft available online for free:
http://www.cpt.univ-mrs.fr/~rovelli/book.pdf
 
  • #82
garrett said:
I can't confirm it contains all the math in Lee Smolin's lectures, as I haven't seen them all, but Rovelli's book does include Lagrangians, Hamiltonians, Poission brackets, gauge fields, spin networks, etc. It is very very good, and I recommend it highly. In my opinion it's the best book on quantum gravity. There's also an early draft available online for free:
http://www.cpt.univ-mrs.fr/~rovelli/book.pdf

I defer to Garrett on this, Mike.

Two side remarks:

1. for a clear simple up-to-date summary of LQG including only the essential ideas, and a lot of pictures aimed at giving intuition, see
Rovelli's January 2006 LYON LECTURE----online are 59 slides

http://www.cpt.univ-mrs.fr/~rovelli/Lyon2006II.pdf

the link is at his website
http://www.cpt.univ-mrs.fr/~rovelli/rovelli.html

2. what Smolin keeps referring to during the first half-dozen lectures or so is sections of his own 2002 paper Quantum Gravity with a Positive Cosmological Constant hep-th/0209079

every so often he will say things like "today we cover sections 2 and 3 of the paper" or "now we are in section 4 of the paper"

sometimes on the blackboard he abbreviates the paper by writing "0209079"
and sometimes he refers to the paper in a kind of slang nickname way as
"\Lambda > 0"

standing for "...Positive Cosmological Constant"

in any case he says he is following that paper, at least in the early lectures

Although it is clear to him what the connection is, and how he is following the paper, the notation may not correspond in all details and I don't find that the paper necessarily helps. What I find myself doing is watching the video lectures repeatedly. second or third time through I grasp more.
 
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  • #83
Although I haven't been able yet to watch the later videos of Smolin's talk, I can say that I have found that repeated viewing really helps. Thinking back to the courses I took in grad school, I wish I had reviewable videos, or had had them then! I would be much better off today!
 
  • #84
The process of expansion or opening a node seems to me a sequence in which the observer's imaginary time line is projected through the node, thus making the node a step from which to then choose the other nodes with which it is connected as next possible steps. Note each transfer into a node (expansion of a node) can be thought of as the observer's regression into the world of that node. Some of the conditions for the node remain the same, but some may change as the observer chooses to negotiate through the matrix.

An old fashioned two step at light speed is continuous...otherwise the dance is discrete.

R.
 
  • #85
Lectures 13 and 14, presented today, are now available on line
 
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  • #86
Sorry I had midterms this week, but I'll try to get caught up more this weekend. Where is everyone in the series?
 
  • #87
CD said:
Sorry I had midterms this week, but I'll try to get caught up more this weekend. Where is everyone in the series?

I've viewed it up until Lecture #14. I get more out when I
go back and watch parts over again, so I will be reviewing
 
  • #88
I'm still waiting to do three. I was away of course, and since I got back I've pampered myself by using my RealPlayer to play classical music radio station WFMT all day. It's really hard to turn off Mozart and Shostakovich for Smolin!:blushing: And my bandwidth isn't enough to do both. Maybe over the weekend.
 
  • #89
selfAdjoint said:
... It's really hard to turn off Mozart and Shostakovich for Smolin!:blushing:.

a long-hair hedonist
and embarrassed to admit it!
probably lives somewhere in the Midwest where they feel guilty about too much pleasure:smile:
 
  • #90
Lectures #15 and 16 are now online
according to what he said last week, Smolin should now quantize the Ashtekar variables in these lectures
(the previous two lectures developed the new-variables version of classical General Relativity)

when you get to the menu of the lectures, remember to flip to page 2 where there is a continuation of the menu
 

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