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21st Winter Workshop on Nuclear Dynamics, Breckenridge, February 5-11, 2005. Quantum Black Holes and Relativistic Heavy Ions. D. Kharzeev BNL. based on DK & K. Tuchin, hep-ph/0501234. The starting point. Big question: How does the produced matter thermalize so fast? - PowerPoint PPT Presentation
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Quantum Black Holesand
Relativistic Heavy Ions
D. Kharzeev
BNL
21st Winter Workshop on Nuclear Dynamics, Breckenridge, February 5-11, 2005
based onDK & K. Tuchin, hep-ph/0501234
The starting point
Big question:
How does the producedmatter thermalize so fast?
Perturbation theory +Kinetic equations
Outline• An elementary theory of the Hawking-Unruh radiation
• A hidden path through the event horizon: from CGC to QGP in less than a fermi
• Phase transitions
• Possible solutions to some of the RHIC puzzles
Black holes radiate
Hawking radiation
Black holes emitthermal radiationwith temperature
S.Hawking ‘74
acceleration of gravityat the surface
Similar things happen in non-inertial frames
Einstein’s Equivalence Principle:
Gravity Acceleration in a non-inertial frame
An observer moving with an acceleration a detectsa thermal radiation with temperature
W.Unruh ‘76
In both cases the radiation is due to the presence of event horizon
Black hole: the interior is hidden from an outside observer; Schwarzschild metric
Accelerated frame: part of space-time is hidden (causally disconnected) from an accelerating observer; Rindler metric
Thermal radiation can be understood as a consequence of tunneling
through the event horizon
You don’t need to know anything except relativistic classical mechanics to understand this:
velocity of a particle moving with an acceleration a
classical action:
it has an imaginary part…
well, now we need some quantum mechanics, too:
The rate of tunnelingunder the potential barrier:
This is a Boltzmann factor with
An example: electric fieldThe force: The acceleration:
The rate:
What is this?Schwinger formula for the rate of pair production;an exact non-perturbative QED result factor of 2: contribution from the field
A quantum observer
consider an observer with internal degrees of freedom;for energy levels E1 and E2 the ratio of occupancy factors
J. Bell:depolarization inaccelerators?
For the excitations with transverse momentum pT:
but this is all purely academic (?)Take g = 9.8 cm/s2; the temperature is only
Where on Earth can one achieve the largestacceleration (deceleration) ?
Relativistic heavy ion collisions!
Why not hadron collisions?Consider a dissociation of a high energy hadron of mass m
into a final hadronic state of mass M; The probability of transition:
Transition amplitude:
In dual resonance model:
Unitarity: P(mM)=const, b=1/2universal slope
limiting acceleration
Hagedorntemperature!
Color Glass Condensate as a necessary condition for
the formation of Quark-Gluon Plasma
The critical acceleration (or the Hagedorn temperature)can be exceeded only if the density of partonic stateschanges accordingly;this means that the average transverse momentum of partons should grow
CGC QGP
Quantum thermal radiation at RHIC
The event horizon emerges due to the fastdecceleration of the colliding nucleiin strong color fields;
Tunneling throughthe event horizon leads to the thermalspectrum
Rindler and Minkowski spaces
Fast thermalization
Rindler coordinates:
QuickTime™ and aTIFF (LZW) decompressor
are needed to see this picture.
QuickTime™ and aTIFF (LZW) decompressor
are needed to see this picture.
collision pointQs
horizons
Gluons tunneling through the event horizons have thermal distribution. They get on mass-shell in t=2Qs
(period of Euclidean motion)
Rapid deceleration induces phase transitions
QuickTime™ and aTIFF (LZW) decompressor
are needed to see this picture.
Nambu-Jona-Lasinio model(BCS - type)
Similar to phenomena in the vicinity of a large black hole: Rindler space Schwarzschild metric
Hawking radiation
New link between General Relativity and QCD;solution to some of the RHIC puzzles?
RHIC event