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shawnlsu
LSU Fan
Member since Nov 2011
7532 posts

re: Temperature below Absolute Zero is Infinitely Hot

So its really frickin cold in hell? Just bring a jacket


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Rambler
Ole Miss Fan
NWA
Member since Jan 2011
600 posts

re: Temperature below Absolute Zero is Infinitely Hot
The real problem is that classical thermodynamics does not have an explicit definition for temperature. Statistical thermo arrives at a usable definition by looking at what fraction of particles reside at each quantized energy level. If the energy distribution is inverted, as these guys seem to have done at low energy states and also occurs in lasers at high energy states, the math used in the definition gives you a negative number for temperature. Whether this really means anything is open to debate.


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Crumble
LSU Fan
Planet LSU
Member since Jan 2006
2103 posts

re: Temperature below Absolute Zero is Infinitely Hot
"The inverted Boltzmann distribution"

Ahhhh, Ok.


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NATidefan
Alabama Fan
Two hours North of Birmingham
Member since Dec 2008
25329 posts

re: Temperature below Absolute Zero is Infinitely Hot
If it's hot, how's it cold???


Kafka
New Orleans Saints Fan
Remember landscaping the Alamo
Member since Jul 2007
79096 posts

re: Temperature below Absolute Zero is Infinitely Hot


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Kafka
New Orleans Saints Fan
Remember landscaping the Alamo
Member since Jul 2007
79096 posts

re: Temperature below Absolute Zero is Infinitely Hot
quote:

If it's hot, how's it cold???


LINK


LaBornNRaised
LSU Fan
The Datty's are Fixed!
Member since Feb 2011
10397 posts

re: Temperature below Absolute Zero is Infinitely Hot
I feel like the sun might be the coldest place in our galaxy now.


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NATidefan
Alabama Fan
Two hours North of Birmingham
Member since Dec 2008
25329 posts

re: Temperature below Absolute Zero is Infinitely Hot
Oh yeah, I forgot about Shannen Doherty


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Spirit of Dunson
Columbia Fan
Member since Mar 2007
22111 posts

re: Temperature below Absolute Zero is Infinitely Hot
quote:

I do science with ultracold atoms (millikelvin temperatures) and this shite is still crazy to me

Have you read the Science article yet? (not the one on the Fox news website).
In your field is going below absolute zero equivalent to breaking the speed of light - it always seemed to me to be an unbreakable barrier. I mean did they really remove more thermal energy from the system, or just restrain available states for the atoms? I need to go back to my statistical mechanics to understand this stuff.

Call ma a skeptic, but I predict that these findings will be redacted in 2 years.


Spirit of Dunson
Columbia Fan
Member since Mar 2007
22111 posts

re: Temperature below Absolute Zero is Infinitely Hot
This articleexplains it much better.


Spirit of Dunson
Columbia Fan
Member since Mar 2007
22111 posts

re: Temperature below Absolute Zero is Infinitely Hot
An excerpt from this article is also helpful:

quote:

The meaning of a negative absolute temperature can best be illustrated with rolling spheres in a hilly landscape, where the valleys stand for a low potential energy and the hills for a high one. The faster the spheres move, the higher their kinetic energy as well: if one starts at positive temperatures and increases the total energy of the spheres by heating them up, the spheres will increasingly spread into regions of high energy. If it were possible to heat the spheres to infinite temperature, there would be an equal probability of finding them at any point in the landscape, irrespective of the potential energy. If one could now add even more energy and thereby heat the spheres even further, they would preferably gather at high-energy states and would be even hotter than at infinite temperature. The Boltzmann distribution would be inverted, and the temperature therefore negative. At first sight it may sound strange that a negative absolute temperature is hotter than a positive one. This is simply a consequence of the historic definition of absolute temperature, however; if it were defined differently, this apparent contradiction would not exist.

I guess my question for those here smarter than me is - should we even be using "Boltzmann distribution" to describe such phenomena? I thought that the boltzmann distribution didn't apply in quantum mechanics. Isn't it only applicable in classical mechanics? I have zero experience in this field, but find it interesting - so let me know if I am just grossly incorrect.


fr33manator
LSU Fan
Baton Rouge
Member since Oct 2010
54484 posts

re: Temperature below Absolute Zero is Infinitely Hot
This actually doesn't surprise me. I've often posited that the flux between alpha and omega states in a sequential sense is like to be extremely disconjunctive. The phase shift is polar without transition time, thus the difference is jarring.

Interesting stuff.


Coon
Nicholls St. Fan
La 56 Southbound
Member since Feb 2005
16292 posts

re: Temperature below Absolute Zero is Infinitely Hot


RealityTiger
LSU Fan
Baton Rouge, LA
Member since Jan 2010
12085 posts
Online

re: Temperature below Absolute Zero is Infinitely Hot


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Pedro
LA-Monroe Fan
the one and only
Member since Jul 2008
19443 posts

re: Temperature below Absolute Zero is Infinitely Hot
This doesnt even begin to make sense... absolute 0 is no molecular motion.

Does shite start moving backwards when it hits negative?

Image: http://www.hockeydrunk.com/wp-content/uploads/2010/04/fricking_magnets.jpg


Scruffy
USA Fan
Member since Jul 2011
38629 posts

re: Temperature below Absolute Zero is Infinitely Hot
Holy hell Pedro, you just discovered time travel.


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Meauxjeaux
Memphis Fan
90248 posts including my alters
Member since Jun 2005
19143 posts

re: Temperature below Absolute Zero is Infinitely Hot
quote:

Temperature below Absolute Zero is Infinitely Hot


So science finally figured out my wife. So cold, yet infinitely hot.

Amen.


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fr33manator
LSU Fan
Baton Rouge
Member since Oct 2010
54484 posts

re: Temperature below Absolute Zero is Infinitely Hot
I'd postulate that you might create a transdimensional portal were you able to achieve a space with the two extremes battling for supremacy.

Of course, you'd need to design a vessel that could pass through it though...


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Rambler
Ole Miss Fan
NWA
Member since Jan 2011
600 posts

re: Temperature below Absolute Zero is Infinitely Hot
Part of the issue is that an inverted distribution is not an equilibrium state. Thermodynamic properties, such as temperature, are only defined for equilibrium states. (This is stated very early in classical thermo texts, then conveniently ignored.) So, using the distribution function calculation for temperature, and getting a negative number for an inverted, non-equilibrium distribution, may not really mean anything in a physical sense.


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C-GAR
LSU Fan
Baton Rouge, LA
Member since Feb 2012
666 posts

re: Temperature below Absolute Zero is Infinitely Hot
quote:

Physicists trolling us hard




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