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Ultracool Gasesfar from Equilibrium
Thomas Gasenzer
Institut für Theoretische Physik Ruprecht-Karls Universität Heidelberg
Philosophenweg 16 • 69120 Heidelberg • Germany
email: [email protected]: www.thphys.uni-heidelberg.de/~gasenzer
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Lecture 1: IntroductionUltracold gases & their dynamics, mean-field theory
Lecture 2: Non-equilibrium QFTFunctional approach, 2PI effective action.
Lecture 3: Far-from-equilibrium DynamicsThermalization. Turbulence & critical dynamics.
Overview
Lecture 3Far-from-equilibrium dynamics
3.1 Equilibration of a1D Fermi gas
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Elastic scattering of classical point-like particles in d dimensions
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Elastic scattering of classical point-like particles in one dimension
Before collision:
p − p
After collision:
− p p
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Elastic scattering of quantum point-like particles in one dimension
Before collision:
p − p
After collision:
− p p
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Equilibration in a quantum system
Hamiltonian can be diagonalised.
Dephasing only (“Decoherence”).
Suppose: Recurrence time large.
System approaches thermal ensemble?
Special rôle of integrable systems
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Heuristic StatisticsJaynes' maximum-entropy principle [PR 106, 620 (57)] :
Generalised Gibbs ensemble at t :
Maximisation of entropy under constraints for macroscopic observables.
fixes
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Heuristic StatisticsJaynes' maximum-entropy principle [PR 106, 620 (57)] :
Generalised Gibbs ensemble at t :
Maximisation of entropy under constraints for macroscopic observables.
Also: Rigol et al., PRL 98, 050405 (07), P. Reimann, PRL 101, 190403 (08).
fixes
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Rôle of conserved quantitiesJaynes' maximum-entropy principle [PR 106, 620 (57)] :
Generalised Gibbs ensemble at t :
Question: What are the operators for the conserved quantities ?
Answer: Is easy only for integrable systems.
See, e.g., Rigol et al., PRL 98 (07); Cazalilla, PRL 97 (06); Barthel and Schollwöck, PRL 100 (08)
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Equilibration of the 1D Fermi gasNumber of particles n�(p,t) with momentum p:
M. Kronenwett & TG, 1006.3330 [cond-mat.quant-gas]
See also (for relativist. Fermions)Berges, Borsanyi, Serreau,NPB (03)Berges, Borsanyi, WetterichPRL (04)
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Equilibration of the 1D Fermi gasNumber of particles n�(p,t) with momentum p:
M. Kronenwett & TG, 1006.3330 [cond-mat.quant-gas]
See also (for relativist. Fermions)Berges, Borsanyi, Serreau,NPB (03)Berges, Borsanyi, WetterichPRL (04)
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Equilibration of the 1D Fermi gasInverse slope function: Thermalisation?
M. Kronenwett & TG, 1006.3330 [cond-mat.quant-gas]
See also (for relativist. Fermions)Berges, Borsanyi, Serreau,NPB (03)Berges, Borsanyi, WetterichPRL (04)
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Equilibration of the 1D Fermi gasInverse slope function: Varying the total energy
M. Kronenwett & TG, 1006.3330 [cond-mat.quant-gas]
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Equilibration of the 1D Fermi gasVarying the total energy: Chemical potential
M. Kronenwett & TG, 1006.3330 [cond-mat.quant-gas]
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Equilibration of the 1D Fermi gasHigh-momentum tails: Power-law distributions
M. Kronenwett & TG, 1006.3330 [cond-mat.quant-gas]
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Fluctuation-dissipation theoremA grand-canonical stateimplies the relation
M. Kronenwett & TG, 1006.3330 [cond-mat.quant-gas]
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Near Equilibrium:Fluctuation-dissipation relation QFT
[A. Branschädel & TG, JPB 41, 135302 (08)]
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Near Equilibrium:Linear Response QFT
[A. Branschädel & TG, JPB 41, 135302 (08)]
Kinetic (Boltzmann) case:Quasiparticles with well-defined energy
p0 = ωp
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
for 2-time time-ordered Green function, carrying two-fold information:
G.ab(x,y) = TC†
a(x)b(y)
= F.ab(x,y) – sgnC(x0–y0) ab(x,y)
where x = (x0, x)
Bosons: [(t,x),†(t,y)] = (x – y)
Dynamical field theoryQFT
i2
statistical ... spectral function
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Equilibration of the 1D Fermi gasEnergy conservation:
M. Kronenwett & TG, 1006.3330 [cond-mat.quant-gas]
3.2 Turbulence& Critical Dynamics
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Nonequilibrium Stationary Dynamics
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Turbulence
Kinetic energy cascade
large scales (source) → small scales
→ dissipation (sink)
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Richardson Cascade
“Big whirls have little whirls that feed on their velocity, and little whirls have lesser whirls and so on to viscosity.”
(L.F. Richardson, 1920)
Kinetic energy cascade
large scales (source) → small scales
→ dissipation (sink)
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Richardson Cascade
“Big whirls have little whirls that feed on their velocity, and little whirls have lesser whirls and so on to viscosity.”
(L.F. Richardson, 1920)
Kinetic energy cascade
large scales (source) → small scales
→ dissipation (sink)
Kolmogorov (1941): scale-invariant, incompressible fluid
E(k) ~ P 2/3 ρ1/3 k—5/3 (Turbulent stationarity)
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Kolmogorov's theory of turbulence(1941)
Take isotropic system: Cascade = Radial momentum transport
k
kx
ky
pump
radial flux
∂t ε(k) = ―∇kp(k)
Energy density ε Energy flux p
Andrey N. Kolmogorov(1903-1987)
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Kolmogorov's theory of turbulence(1941)
Cascade = Transport in momentum space:
Radial energy density E = k2ε [kg s—2]
log E(k)
log klog L-1
pump
3D:
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Kolmogorov's theory of turbulence(1941)
Stationary E-distribution in cascade?
Radial energy density E = k2ε [kg s—2]
log E(k)
log k log η-1log L-1
pump
dump
3D:
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Kolmogorov's theory of turbulence(1941)
Assume self-similarity:
Radial energy density E = k2ε [kg s—2] Radial energy flux P = k2|p| [kg m—1 s—3]
log E(k)
log k
E(k) ~ k—ζ
pump
dump
3D:
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Kolmogorov's theory of turbulence(1941)
Assume self-similarity:
Radial energy density E [kg s—2] Radial energy flux P [kg m—1 s—3]
log E(k)
log k
E(k) ~ P 2/3 ...
pump
dump
Dimensional analysis:
3D:
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Kolmogorov's theory of turbulence(1941)
Scale invariant (self-similar) stationary transport:
Radial energy density E [kg s—2] Radial energy flux P [kg m—1 s—3] Density ρ [kg m—3]
log E(k)
log k
E(k) ~ P 2/3 ρ1/3 k—5/3
pump
dump
Dimensional analysis:
3D:
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Compare: Thermal Equilibrium
Constant energy ε ~ E/k2 (In 3D):
Radial energy density E [kg s—2]
log ε(k)
log k
ε(k) ~ ω n ~ T
(Rayleigh-Jeans: n ~ T/ω )
3D:
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Compare: Thermal Equilibrium
Constant energy ε ~ E/k2 (In 3D):
Radial energy density E [kg s—2]
log E(k)
log k
E(k) ~ ω n k2
~ T k2
(Rayleigh-Jeans: n ~ T/ω )
3D:
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
SummaryScaling stationary solutions:
log E(k)
log k
E(k) ~ k—ζ
n(k) ~ k—κ
pump
dump
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Origin of radial fluxBalance equation for radial flux
k
kx
ky
pump
radial flux
rad. occupation no. n rad. particle flux Q
∂t n(k) = ― ∂k Q(k)
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Origin of radial fluxWith kinetic (Boltzmann) eq.
k
kx
ky
pump
radial flux
∂t n(k) = ― ∂k Q(k)
~ k2 J(k)
Boltzmannscattering integral
rad. occupation no. n rad. particle flux Q
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Kinetic equation
Flow in momentum space from kinetic (Boltzmann) equation:
Scattering integral:
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
To derive scaling Familiarize the...
Critical dynamicsbeyond kinetic theory
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Dynamical field theory
Kinetic (Quantum-Boltzmann) eq.:
Dynamic (Schwinger-Dyson) eq.:
or...
Scattering integral:
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Dynamical field theory
Kinetic (Quantum-Boltzmann) eq.:
Dynamic (Schwinger-Dyson) eq.: (from 2PI effective action)
Scattering integral:
p = ( p0, p):
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Strong turbulence
p = ( p0, p):
2PI to NLO in 1/N: Vertex:
[J. Berges, NPA 699 (02) 847; G. Aarts et al., PRD 66 (02) 45008]
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Strong Turbulence in 2D
momentum p
κ = 4
κ = 4/3κ = 2
nonequilibriumthermalequilibrium
n ~ k -κ
C. Scheppach, J. Berges, TG PRA 81 (10) 033611 J. Berges et al., PRL 101 (08) 041603
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Simulations in 2+1 D (semi-classical)
Remember:
B. Nowak, D. Sexty, TG (unpublished)
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Simulations in 3+1 D (semi-classical)
B. Nowak, D. Sexty, TG (unpublished)
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Simulations in 3+1 D (semi-classical)
B. Nowak, D. Sexty, TG (unpublished)
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Simulations in 3+1 D (semi-classical)
B. Nowak, D. Sexty, TG (unpublished)
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
3D Simulation
relativistic Bose gas
J. Berges, A. Rothkopf, and J. Schmidt, PRL 101 (08) 041603
“ultracold” Bose gas
B. Nowak, D. Sexty, TG (unpublished)
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Simulations in 2+1 D (semi-classical)
Remember:
B. Nowak, D. Sexty, TG (unpublished)
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Simulations in 2+1 D (semi-classical)
Remember:
B. Nowak, D. Sexty, TG (unpublished)
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Simulations in 2+1 D (semi-classical)
Remember:
B. Nowak, D. Sexty, TG (unpublished)
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Simulations in 2+1 D (semi-classical)
Remember:
B. Nowak, D. Sexty, TG (unpublished)
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Turbulence as a fixed point
[Fig.: Berges 08]
The
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Thanks & credits to......my work group in Heidelberg:
Cédric Bodet Matthias KronenwettBoris Nowak Denes SextyMartin TrappeJan Zill
Alexander Branschädel ( Karlsruhe)Stefan Keßler ( LMU München)Christian Scheppach ( Cambridge, UK)Philipp Struck ( Konstanz) Kristan Temme ( Vienna)
...my collaboratorsJürgen Berges (Darmstadt) • Hrvoje Buljan (Zagreb) • Keith Burnett (Oxford/ Sheffield) • David Hutchinson (Otago) • Paul S. Julienne (NIST Gaithersburg) • Thorsten Köhler (Oxford/UCL) • Otto Nachtmann (Heidelberg) • Markus K. Oberthaler (Heidelberg) • Jan M. Pawlowski (Heidelberg) • Robert Pezer (Sisak) • David Roberts (Oxford/Los Alamos) • Janne Ruostekoski (Southampton) • Michael G. Schmidt (Heidelberg) • Marcos Seco (Santiago de Compostela)
LGFG BaWue
€€€...
ExtreMe Matter Institute
Supplementary slides
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Nonthermal Equilibration in a quantum system
M. Rigol, V. Dunjko, V. Yurovsky, M. Olshanii, PRL 98, 050405 (2007)
S. R. Manmana, S. Wessel, R. M. Noack, A. Muramatsu, PRL 98, 210405 (2007)
D. M. Gangardt, M. Pustilnik, PRA 77, 041604(R) (2009)
M. Cazalilla, PRL 97, 156403 (2006)
C. Kollath, A. M. Läuchli, E. Altman, PRL 98, 180601 (2007)
M. Eckstein, M. Kollar, PRL 100, 120404 (2008)
M. Moeckel, S. Kehrein, PRL 100, 175702 (2008)
A. Iucci, M. A. Cazalilla, PRA 80, 063619 (2009)
D. M. Kennes, V. Meden, arXiv:1006.0927v1 [cond-mat.str-el] (2010)
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Integrable Lieb & Liniger model
Lieb-Liniger Bose gas in 1D: [PR 130, 1605 & 1616 (63)]
Solution via Bethe-Ansatz with cusp conditions @ particle contact hyperplanes
c > 0
xi = xj Dirichlet-von Neumann
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Dynamics: H. Buljan, R. Pezer, & TG, PRL 100 (2008)
Integrable Lieb & Liniger model
Lieb-Liniger Bose gas in 1D: [PR 130, 1605 & 1616 (63)]
Solution via Bethe-Ansatz with cusp conditions @ particle contact hyperplanes
c > 0
xi = xj Dirichlet-von Neumann
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Tomonaga-Luttinger Liquid model1D Fermi gas with contact interactions. e.g. Schultz et al. cond-mat/9807366
Bosonize by replacing as follows:
(right/left-moving particle-hole pairs)
particle-holecontinuum
Includeall energies < 0!
k k+q
}εq
TomonagaLuttinger
Lieb & Mattis
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Tomonaga-Luttinger Liquid model
Bosonization ⇒ quadratic Hamiltonian
Quartic fermion interaction
TomonagaLuttinger
Lieb & Mattis
Expect nonthermal evolution after switching on interactions:
Iucci & Cazalilla, 1003.5170 [cond-mat], also Kennes & Meden 1006.0927 [cond-mat]
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Simulations in 2+1 D (semi-classical)
Evolution of mom. distr. of a 2D Bose gas following an interaction quench
B. Nowak, D. Sexty, TG (unpublished)
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Simulations in 2+1 D (semi-classical)
B. Nowak, D. Sexty, TG (unpublished)
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Simulations in 2+1 D (semi-classical)
Remember:
B. Nowak, D. Sexty, TG (unpublished)
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Simulations in 2+1 D (semi-classical)
Remember:
B. Nowak, D. Sexty, TG (unpublished)
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Simulations in 2+1 D (semi-classical)
Remember:
B. Nowak, D. Sexty, TG (unpublished)
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Scaling exponents( in d dimensions )
κ = dConstant P(k) ≡ P Constant Q(p)
κ = d −2/3
n ~ k -κ
C. Scheppach, J. Berges, T. Gasenzer PRA 81 (10) 033611
UV:
IR: κ = d +4 κ = d +2
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Turbulence in a Bose Einstein Condensate
[E.A.L. Henn et al. PRL (09)]
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Turbulence in a Bose Einstein Condensate
[E.A.L. Henn et al. PRL (09)]
[Abu-Shaeer et al. (01)]
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Turbulence in a Bose Einstein Condensate
[N. Berloff & B. Svistunov, PRA (02)] [E.A.L. Henn et al. PRL (09)]
[Abu-Shaeer et al. (01)]
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Wave turbulence
Turbulent thermalisation after universe inflation
[Micha & Tkachev, PRL 90 (03) 121301, PRD 70 (04) 043538]
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Wave turbulence
[Micha & Tkachev, PRL 90 (03) 121301, PRD 70 (04) 043538]
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
To derive scaling Familiarize the...
V.E. Zakharov, V.S. L'vov, G. Falkovich, Kolmogorov Spectra of Turbulence I (Springer, Berlin, 1992)
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
To derive scaling Familiarize the...
V.E. Zakharov, V.S. L'vov, G. Falkovich, Kolmogorov Spectra of Turbulence I (Springer, Berlin, 1992)
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
(Weak) wave turbulence
Flow in momentum space from kinetic (Boltzmann) equation:
∂kP(k) ~ J(k) ⇒ Stationarity if J(k) = 0
Scattering integral:
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
(Weak) wave turbulence
Flow in momentum space from kinetic (Boltzmann) equation:
∂kP(k) ~ J(k) ~ nk3 ⇒ nk ~ P 1/3
⇒ E(k) ~ (Pρ2)1/3 ωk k—7/3
Scattering integral:
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
(Weak) wave turbulence Scaling solutions
Constant energy flux P:
E(k) ~ (Pρ2)1/3 ωk k—7/3
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
(Weak) wave turbulence Scaling solutions
Constant energy flux P:
Constant particle flux Q (P Pk = ωkQ):
E(k) ~ (Pρ2)1/3 ωk k—7/3
E(k) ~ (Qρ2)1/3 ωk4/3
k—7/3
⇒ 2 distinct scaling laws!
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Scaling solutions
Want to look for scaling solutions fulfilling stationarity condition J(p) = 0
Scaling ansatz:
Implies scaling of the single-particle momentum distribution ( ):
( )
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Stationarity Conditionin the full dynamical theory
p = ( p0, p):
(Bosons with 3- and 4-interactions, 2PI diagrams to O(g2)
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Ultraviolet scaling exponent( large p in d dims)
κ = d
κ = d + 4(z ̶ 2 +η)/ 3
Corresponds to constant P(p)
[C. Scheppach, J. Berges, & TG, to be submitted]
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Ultraviolet scaling exponent( large p in d dims)
κ = d −2/3
κ = d + z ̶ 4(2 ̶ η)/ 3
Corresponds to constant Q(p)
[C. Scheppach, J. Berges, & TG, to be submitted]
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Ultraviolet scaling exponent( large p in d dims)
κ = d −2/3
κ = d + z ̶ 4(2 ̶ η)/ 3
Corresponds to constant Q(p)
Not present in general dynamical case!
[C. Scheppach, J. Berges, & TG, to be submitted]
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Scattering integral
Strong turbulence
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Infrared scaling modification
momentum p
κ = 7
κ = 3κ = 2
nonequilibrium
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Stationarity Conditionin the full dynamical theory
p = ( p0, p):
2PI to NLO in 1/N: Vertex:
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
IR scaling exponent( small p in d dims)
κ = d + 4
κ = d + 2z
Corresponds to constant P(p)
[Berges et al., PRL 101 (2008) 041603, C. Scheppach, J. Berges, & TG, to be submitted]
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
IR scaling exponent( small p in d dims)
κ = d + 2
κ = d + z
Corresponds to constant Q(p)
[Berges et al., PRL 101 (2008) 041603, C. Scheppach, J. Berges, & TG, to be submitted]
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
IR scaling exponent( small p in d dims)
κ = d + 2
κ = d + z
Corresponds to constant Q(p)
[Berges et al., PRL 101 (2008) 041603, C. Scheppach, J. Berges, & TG, to be submitted]
Should not be present in general dynamical case either!
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Summary
momentum p
κ = 7
κ = 3κ = 2
nonequilibrium
κ = 3/2 κ = 4
relativistic simulation
[Berges et al., PRL 101 (2008) 041603]
equilibrium
BEC10 Summer School · MPIPKS Dresden · 10. August 2010 · Lecture 3 Thomas Gasenzer
Lewis Fry Richardson, FRS (1881-1953)
Big whirls have little whirls that feed on their velocity,and little whirls have lesser whirls and so on to viscosity.
(L.F. Richardson, The supply of energy from and to Atmospheric Eddies, 1920)
Great fleas have little fleas upon their backs to bite 'em,And little fleas have lesser fleas, and so ad infinitum.And the great fleas themselves, in turn, have greater fleas to go on;While these again have greater still, and greater still, and so on.
(Augustus de Morgan, A Budget of Paradoxes, 1872, p. 370)
So, naturalists observe, a fleaHas smaller fleas that on him prey;And these have smaller still to bite 'em;And so proceed ad infinitum.
(Jonathan Swift: Poetry, a Rhapsody, 1733)