Comments on: From Quantum to Cosmos-I http://blogs.discovermagazine.com/cosmicvariance/2006/05/22/from-quantum-to-cosmos-i/ Random samplings from a universe of ideas. Mon, 01 Dec 2008 22:27:00 +0000 http://wordpress.org/?v=2.3.1 By: From Quantum to Cosmos-II | Cosmic Variance http://blogs.discovermagazine.com/cosmicvariance/2006/05/22/from-quantum-to-cosmos-i/#comment-16348 From Quantum to Cosmos-II | Cosmic Variance Thu, 29 Jun 2006 14:59:06 +0000 http://blogs.discovermagazine.com/cosmicvariance/2006/05/22/from-quantum-to-cosmos-i/#comment-16348 [...] I mentioned last time that I had seen some exciting talks by people involved in cold atom physics, which is quite far away from what I do, but which fascinated me. This time I wanted to report, albeit idiosyncratically, on discussions that were more closely related to my fields of expertise. [...] […] I mentioned last time that I had seen some exciting talks by people involved in cold atom physics, which is quite far away from what I do, but which fascinated me. This time I wanted to report, albeit idiosyncratically, on discussions that were more closely related to my fields of expertise. […]

]]> By: Fun With Bose-Einstein Applets | Cosmic Variance http://blogs.discovermagazine.com/cosmicvariance/2006/05/22/from-quantum-to-cosmos-i/#comment-16347 Fun With Bose-Einstein Applets | Cosmic Variance Thu, 29 Jun 2006 14:57:12 +0000 http://blogs.discovermagazine.com/cosmicvariance/2006/05/22/from-quantum-to-cosmos-i/#comment-16347 [...] In one of my recent posts, about the Quantum to Cosmos meeting, I was enthusing about the beautiful physics of cold atoms. While writing, I was reminded of a wonderful Java applet about this topic, which I learned about in a colloquium that I saw Carl Weiman give a few years ago, before he won the Nobel Prize (but when people were sure he was going to get it). [...] […] In one of my recent posts, about the Quantum to Cosmos meeting, I was enthusing about the beautiful physics of cold atoms. While writing, I was reminded of a wonderful Java applet about this topic, which I learned about in a colloquium that I saw Carl Weiman give a few years ago, before he won the Nobel Prize (but when people were sure he was going to get it). […]

]]> By: Cosmic Variance http://blogs.discovermagazine.com/cosmicvariance/2006/05/22/from-quantum-to-cosmos-i/#comment-16346 Cosmic Variance Thu, 01 Jun 2006 02:16:34 +0000 http://blogs.discovermagazine.com/cosmicvariance/2006/05/22/from-quantum-to-cosmos-i/#comment-16346 <strong>Fun With Bose-Einstein Applets</strong> In one of my recent posts, about the Quantum to Cosmos meeting, I was enthusing about the beautiful physics of cold atoms. While writing, I was reminded of a wonderful Java applet about this topic, which I learned about in a colloquium that I saw Carl... Fun With Bose-Einstein Applets

In one of my recent posts, about the Quantum to Cosmos meeting, I was enthusing about the beautiful physics of cold atoms. While writing, I was reminded of a wonderful Java applet about this topic, which I learned about in a colloquium that I saw Carl…

]]> By: Shantanu http://blogs.discovermagazine.com/cosmicvariance/2006/05/22/from-quantum-to-cosmos-i/#comment-16345 Shantanu Wed, 24 May 2006 22:03:50 +0000 http://blogs.discovermagazine.com/cosmicvariance/2006/05/22/from-quantum-to-cosmos-i/#comment-16345 Thanks, Mark . Thanks, Mark .

]]> By: Mark http://blogs.discovermagazine.com/cosmicvariance/2006/05/22/from-quantum-to-cosmos-i/#comment-16344 Mark Wed, 24 May 2006 04:23:19 +0000 http://blogs.discovermagazine.com/cosmicvariance/2006/05/22/from-quantum-to-cosmos-i/#comment-16344 Hi Shantenu. It hasn't been mentioned here (although I skipped a few talks today), except in passing. I'll keep my ears open though and try to report if I hear anything first hand. Hi Shantenu. It hasn’t been mentioned here (although I skipped a few talks today), except in passing. I’ll keep my ears open though and try to report if I hear anything first hand.

]]> By: Shantanu http://blogs.discovermagazine.com/cosmicvariance/2006/05/22/from-quantum-to-cosmos-i/#comment-16343 Shantanu Wed, 24 May 2006 02:23:39 +0000 http://blogs.discovermagazine.com/cosmicvariance/2006/05/22/from-quantum-to-cosmos-i/#comment-16343 Mark ,from this meeting (or elsewhere) do you knwo about the current status of the <a>AMS </a> experiment? Thanks Mark ,from this meeting (or elsewhere) do you knwo about the current status of
the AMS experiment?
Thanks

]]> By: Not Even Wrong » Blog Archive » Various Links http://blogs.discovermagazine.com/cosmicvariance/2006/05/22/from-quantum-to-cosmos-i/#comment-16342 Not Even Wrong » Blog Archive » Various Links Mon, 22 May 2006 20:34:02 +0000 http://blogs.discovermagazine.com/cosmicvariance/2006/05/22/from-quantum-to-cosmos-i/#comment-16342 [...] Update: There’s a conference going on near Washington this week entitled From Quantum to Cosmos: Fundamental Physics Research in Space. Mark Trodden is blogging from the conference over at Cosmic Variance. [...] […] Update: There’s a conference going on near Washington this week entitled From Quantum to Cosmos: Fundamental Physics Research in Space. Mark Trodden is blogging from the conference over at Cosmic Variance. […]

]]> By: Scott H. http://blogs.discovermagazine.com/cosmicvariance/2006/05/22/from-quantum-to-cosmos-i/#comment-16341 Scott H. Mon, 22 May 2006 20:05:51 +0000 http://blogs.discovermagazine.com/cosmicvariance/2006/05/22/from-quantum-to-cosmos-i/#comment-16341 Hey Mark --- When you get a chance, check out Dan Kleppner's reference frame article in the March 2006 issue of 'Physics Today'; it's a general discussion of setting time standards. One of the points made there is that time standards are getting sufficiently accurate that effects like tides and (on longer timescales) redistribution of water and glacial melting cause the earth's geoid to vary by a foot or more over the appropriate timescales. Thus, having clocks accurate enough to sense the redshift over this distance means that one cannot even define the time that they keep - time standards are going to have a built-in fuzziness enforced by the variation of earth's gravitational field. We always knew that GR meant "bye bye time standards" in principle; before too long, it will be true in practice (albeit at a tiny tiny tiny level). Speaking of which, back to grading GR final exams ... cheers, scott h. Hey Mark —

When you get a chance, check out Dan Kleppner’s reference frame article in the March 2006 issue of ‘Physics Today’; it’s a general discussion of setting time standards. One of the points made there is that time standards are getting sufficiently accurate that effects like tides and (on longer timescales) redistribution of water and glacial melting cause the earth’s geoid to vary by a foot or more over the appropriate timescales. Thus, having clocks accurate enough to sense the redshift over this distance means that one cannot even define the time that they keep - time standards are going to have a built-in fuzziness enforced by the variation of earth’s gravitational field. We always knew that GR meant “bye bye time standards” in principle; before too long, it will be true in practice (albeit at a tiny tiny tiny level).

Speaking of which, back to grading GR final exams …

cheers,

scott h.

]]> By: spyder http://blogs.discovermagazine.com/cosmicvariance/2006/05/22/from-quantum-to-cosmos-i/#comment-16340 spyder Mon, 22 May 2006 19:58:16 +0000 http://blogs.discovermagazine.com/cosmicvariance/2006/05/22/from-quantum-to-cosmos-i/#comment-16340 The cutting of funding for NASA, and especially for scientific research will come at a much bigger cost to all of us down the road. One of the few venues in which non-oil based energy systems are absolutely required is space. As we move towards pollution of the planet, thermally, chemically, radioactively, and bounce across the "all to soon to be popped" peak oil bubble, space is the one place where fundamental research on alternative energy systems must be encouraged and funded. Yet, for some really unclear and perhaps even irrational reasons, the US and other nations (to a lesser extent) shift away from proposing and funding these all too important research opportunities. When we wait, and we will wait, until something dire must be done, it will be vastly more costly and vastly more rushed and hurried. This is bad scientific thinking on the part of politicians, who unfortunately seem to be doing an awful lot of bad science thinking these days. The cutting of funding for NASA, and especially for scientific research will come at a much bigger cost to all of us down the road. One of the few venues in which non-oil based energy systems are absolutely required is space. As we move towards pollution of the planet, thermally, chemically, radioactively, and bounce across the “all to soon to be popped” peak oil bubble, space is the one place where fundamental research on alternative energy systems must be encouraged and funded. Yet, for some really unclear and perhaps even irrational reasons, the US and other nations (to a lesser extent) shift away from proposing and funding these all too important research opportunities. When we wait, and we will wait, until something dire must be done, it will be vastly more costly and vastly more rushed and hurried. This is bad scientific thinking on the part of politicians, who unfortunately seem to be doing an awful lot of bad science thinking these days.

]]> By: Belizean http://blogs.discovermagazine.com/cosmicvariance/2006/05/22/from-quantum-to-cosmos-i/#comment-16336 Belizean Mon, 22 May 2006 17:38:23 +0000 http://blogs.discovermagazine.com/cosmicvariance/2006/05/22/from-quantum-to-cosmos-i/#comment-16336 <blockquote>...the accuracy of atomic clocks has recently improved to the point at which it has become possible to measure the gravitational redshift on Earth over a vertical distance of one foot!</blockquote> Wow! Thanks for sharing!

…the accuracy of atomic clocks has recently improved to the point at which it has become possible to measure the gravitational redshift on Earth over a vertical distance of one foot!

Wow! Thanks for sharing!

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