Qcd and the perfect liquid
Posted Oct24-10 at 09:27 PM by jal
QCD AND THE PERFECT LIQUID
There are a lot of people trying to get a better understanding of QCD, confinement, deconfinement and perfect liquid.
Why would people get together at conferences? To compare “notes”, to find another way of explaining what is going on, OR maybe to overcome an unseen mental hurdle that is preventing them from “progressing”.
I found two recent conferences.
http://147.96.27.42//conferenceTimeTable.py?confId=0
QCHS IX
From 30 August 2010 to 03 September 2010This conference is the ninth in a biennial series whose aim is to bring together people working in QCD and strong-interaction dynamics, both theoreticians and experimentalists.
===
http://theor.jinr.ru/cpod/Dubna_2010_program2.htm
The 6th workshop on "Critical Point and Onset of Deconfinement" will take place in the period August 23-29, 2010 in the Conference Hall of the Bogoliubov Laboratory for Theoretical Physics at the JINR Dubna.
===
Here is a good paper to start getting an understanding.
http://theor.jinr.ru/cpod/Talks/2208...ieri_intro.pdf
Quark Gluon plasma, Heavy ion collisions, Perfect liquids
Giorgio Torrieri
===
Then there is this paper.
http://arxiv.org/abs/0911.5479
Quark fluids in heavy ion collisions
Giorgio Torrieri
(Submitted on 29 Nov 2009)
We give a pedagogical introduction (suitable to upper level physics undergraduates) to the field of ultrarelativistic heavy ion collisions. We pay particular attention to our understanding of the thermodynamic and hydrodynamic properties of the matter created in heavy ion collisions at RHIC energies.
A SAMPLE OF THE PRESENTATION
For small distances charges between quarks are small, for large distances effective charges become larger (gluon vacuum fluctuations make them increase), and for a distance of about 1f m they diverge: The system becomes some not yet understood coherent collective system of many quarks and gluons.
Since most quarks are not heavy, but actually ~ the electron mass, the tube can only be stretched
until a pretty small ( ∼ 1 fm, 10 −15 m) distance.
Beyond it, the energy field will become strong enough to make new stable quarks out of the vacuum, and the string “breaks” into new color-neutral quark-antiquark pairs.
So, would it be possible to produce “free quarks” that can travel and interact over a large volume? The previous discussion does leave a way out: If the distance between a bunch of protons and neutrons becomes comparable to the proton size, the bags “melt” and quarks behave as normal particles, interacting via a weak potential.
One way to do this would be to compress “a lot of ” nuclear matter to the point where the average separation between the nuclei would be less than the size of the proton. Quarks would then be free to jump from bag to bag, so the bags would, presumably simply disappear. Another way to see it is to realize that the such a compressed system becomes so hot that quarks will be able to overcome the string-like potential and travel from quark to quark. Such a picture is strongly suggestive of a phase transition, similar to the phase transition between ice and water (which occurs when molecules get enough average energy to escape the intermolecular forces which keep them in their position in
the ice crystal).
===
For a more in depth look, check out Giorgio Torrieri’s latest paper.
http://arxiv.org/abs/1009.2286
Conformal Holography of Bulk Elliptic Flow and Heavy Quark Quenching in Relativistic Heavy Ion Collisions
Jorge Noronha (Columbia U.), Miklos Gyulassy (Columbia U.), Giorgio Torrieri (Frankfurt U., FIAS)
(Submitted on 13 Sep 2010)
There are a lot of people trying to get a better understanding of QCD, confinement, deconfinement and perfect liquid.
Why would people get together at conferences? To compare “notes”, to find another way of explaining what is going on, OR maybe to overcome an unseen mental hurdle that is preventing them from “progressing”.
I found two recent conferences.
http://147.96.27.42//conferenceTimeTable.py?confId=0
QCHS IX
From 30 August 2010 to 03 September 2010This conference is the ninth in a biennial series whose aim is to bring together people working in QCD and strong-interaction dynamics, both theoreticians and experimentalists.
===
http://theor.jinr.ru/cpod/Dubna_2010_program2.htm
The 6th workshop on "Critical Point and Onset of Deconfinement" will take place in the period August 23-29, 2010 in the Conference Hall of the Bogoliubov Laboratory for Theoretical Physics at the JINR Dubna.
===
Here is a good paper to start getting an understanding.
http://theor.jinr.ru/cpod/Talks/2208...ieri_intro.pdf
Quark Gluon plasma, Heavy ion collisions, Perfect liquids
Giorgio Torrieri
===
Then there is this paper.
http://arxiv.org/abs/0911.5479
Quark fluids in heavy ion collisions
Giorgio Torrieri
(Submitted on 29 Nov 2009)
We give a pedagogical introduction (suitable to upper level physics undergraduates) to the field of ultrarelativistic heavy ion collisions. We pay particular attention to our understanding of the thermodynamic and hydrodynamic properties of the matter created in heavy ion collisions at RHIC energies.
A SAMPLE OF THE PRESENTATION
For small distances charges between quarks are small, for large distances effective charges become larger (gluon vacuum fluctuations make them increase), and for a distance of about 1f m they diverge: The system becomes some not yet understood coherent collective system of many quarks and gluons.
Since most quarks are not heavy, but actually ~ the electron mass, the tube can only be stretched
until a pretty small ( ∼ 1 fm, 10 −15 m) distance.
Beyond it, the energy field will become strong enough to make new stable quarks out of the vacuum, and the string “breaks” into new color-neutral quark-antiquark pairs.
So, would it be possible to produce “free quarks” that can travel and interact over a large volume? The previous discussion does leave a way out: If the distance between a bunch of protons and neutrons becomes comparable to the proton size, the bags “melt” and quarks behave as normal particles, interacting via a weak potential.
One way to do this would be to compress “a lot of ” nuclear matter to the point where the average separation between the nuclei would be less than the size of the proton. Quarks would then be free to jump from bag to bag, so the bags would, presumably simply disappear. Another way to see it is to realize that the such a compressed system becomes so hot that quarks will be able to overcome the string-like potential and travel from quark to quark. Such a picture is strongly suggestive of a phase transition, similar to the phase transition between ice and water (which occurs when molecules get enough average energy to escape the intermolecular forces which keep them in their position in
the ice crystal).
===
For a more in depth look, check out Giorgio Torrieri’s latest paper.
http://arxiv.org/abs/1009.2286
Conformal Holography of Bulk Elliptic Flow and Heavy Quark Quenching in Relativistic Heavy Ion Collisions
Jorge Noronha (Columbia U.), Miklos Gyulassy (Columbia U.), Giorgio Torrieri (Frankfurt U., FIAS)
(Submitted on 13 Sep 2010)
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