Hydrodynamics, AdS/CFT Correspondence & the RidgeHydrodynamics, AdS/CFT Correspondence & the...

Hydrodynamics, AdS/CFT Correspondence & the Ridge

Hydrodynamics

INT Workshop: The “Ridge”, INT, Seattle, May 11th 2012

Matthias Kaminski (University of Washington)

Hydrodynamics, AdS/CFT Correspondence & the Ridge

Hydrodynamics

Hydrodynamics, non-AdS/non-CFT Correspondence & the Ridge

Hydrodynamics

Hydrodynamics, Gauge/Gravity Correspondence & the Ridge

(non-)Hydro

dynamics

Hydrodynamics, Gauge/Gravity Correspondence & the Ridge

(non-)Hydro

dynamics

Matthias Kaminski Hydrodynamics, Gauge/Gravity Correspondence & the Ridge Page 4

Invitation

Properties of Gauge/Gravity

•only toy models

•no model of QCD or SM•no quantitative results (mass)•QCD in this universality class?

Negative Positive

•strong coupling effects•models thermalization, etc•exact solutions exist•qualitative results (scaling)•some universal results

Invitation

•only toy models

Negative Positive

The Ridge Phenomenon

•strong coupling effects?•pre-thermalization?•needs qualitative explanation•some “universal” results?

Invitation

•only toy models

Negative Positive

The Ridge Phenomenon

•strong coupling effects?•pre-thermalization?•needs qualitative explanation•some “universal” results?

Gauge/Gravityseems like

an appropriate tool.

InvitationGauge/Gravity Dictionary

Gauge Theory Gravity Theory

“Medium” after collision

Backgroundgeometry(metric, gauge fields, ...)

Temperature Hawking T ~ horizon radius

gµ!(r)

gµ!(r; rHorizon)

Thermalization Horizon formation

Pre-Equilibrium(difficult)

Shock-wave collision

gµ!(r)

gµ!(r; rHorizon)

gµ!(r, t, !x)

Thermalization Horizon formation

Pre-Equilibrium(difficult)

Shock-wave collision

gµ!(r)

gµ!(r; rHorizon)

gµ!(r, t, !x)

Two-point correlations (relatively easy)

Fluctuations of gravity fields

!gµ!(r, t, "x)

Outline✓ Invitation

I. Review: Gauge/Gravity & Heavy-Ion-Collisions

II. Gauge/Gravity Models for the Ridge

III. Other Possibilities

IV. Conclusions

• Shock-Wave Metric yields Pre-Equilibrium

• Fluctuations give Correlation Functions

• Gauge/Gravity

• Completed Hydrodynamics

IV. Conclusions

• Gauge/Gravity

• Completed HydrodynamicsCorrections

to “(causal) viscous hydro”,new methods

IV. Conclusions

• Gauge/Gravity

A “first guess”

IV. Conclusions

• Gauge/Gravity

A “first guess”

Toy models of full collision

IV. Conclusions

• Gauge/Gravity

A “first guess”

Systematic scan for origin of ridge

IV. Conclusions

• Gauge/Gravity

Toy models for hydrodynamic flow vs. toy models of jets

A “first guess”

What has been done to holographically model HIC?

I. Gauge/Gravity & Heavy-Ion-Collisions

Quite a bit

Not much

We are going to discuss only examples here. This is not a full review. Review: [Gubser, Karch 0901.0935]

Chiral vortex effect

Heavy-ion-collision

Fluid/Gravity

Einstein equations

=hydrodyn. conservation equations

+dynamicalEOMs forgravity fields

[Bhattacharyya et al. 0712.2456][Baier et al. 2007]

Heavy-ion-collision

Fluid/Gravity

Einstein equations

Complete constitutive relation for EM-tensor, values for transport coefficients.

(completes Israel-Stewart)

[Bhattacharyya et al. 0712.2456][Baier et al. 2007]

Heavy-ion-collision

Fluid/Gravity

Einstein equations

[Bhattacharyya et al. 0712.2456]

It gives you all there is!

[Baier et al. 2007]

Heavy-ion-collision

Fluid/Gravity

Einstein equations

Fluid/Gravity derivation of chiral vortex effect.[Erdmenger, Haack, MK, Yarom 0809.2488]

[Banerjee et al. 0809.2596]

[Baier et al. 2007]

Computed all first/second order transport coefficients in a gravity dual without B.

Heavy-ion-collision

Fluid/Gravity

Einstein equations

Pure field theory derivation.

Fluid/Gravity derivation of chiral vortex effect.[Erdmenger, Haack, MK, Yarom 0809.2488]

[Son,Surowka 0906.5044]

[Banerjee et al. 0809.2596]

[Kharzeev et al., 2007][Fukushima et al., 2008]

In parallel: chiral magnetic effect.

[Baier et al. 2007]

Computed all first/second order transport coefficients in a gravity dual without B.

Constitutive equations

Hydrodynamics

jµ = nuµ! !T (gµ! + uµu!)"!

Tµ! =!

3(4uµu! + gµ!) + !µ!

2"µ!"#

u!#"u#

Hydrodynamics is an effective field theory, an expansion in gradients (equivalently: low frequencies and large momenta).

VorticityNEW!

! "# $

=:!µ!

Example: Relativistic fluids with one conserved charge,

with an anomaly (chiral)

[cf. talk by B. Müller]

Examples

Hydrodynamics

jµ = nuµ! !T (gµ! + uµu!)"!

Tµ! =!

3(4uµu! + gµ!) + !µ!

2"µ!"#

u!#"u#

from writing down all possible terms (respecting symmetries) with one derivative, built from .

Hydrodynamics is an effective field theory, an expansion in gradients (equivalently: low frequencies and large momenta).

{!!µ, !!T, nu! ,

"!"n, u!n!"u

", . . . }

{u, !, T, n, µ, !µ!"...}

VorticityNEW!

! "# $

=:!µ!

Example: Relativistic fluids with one conserved charge,

with an anomaly (chiral)

2. Restricted by conservation equations

0 = !µnuµ

= n!µuµ

+ uµ!µn

Example: no external fields

Possibly restricted by conformal symmetry

Example: invariant under Weyl rescaling

3. Further restricted by positivity of entropy production

!µJµ

s " 0[Landau, Lifshitz]

1.Write down all first order (pseudo)vectors and (pseudo)tensors

!µjµ= CEµBµ!µTµ!

= F !"j"

I. Gauge/Gravity & Heavy-Ion-CollisionsHydrodynamics: first order traditional procedure

Complete constitutive equations in 3+1 (with external gauge field)

(non-conformal) hydrodynamics in 3+1

Tµ! = (! + P )uµu! + Pgµ!! "!µ"!!#(#"u# + ##u") ! ($ !

3")!µ!

V µ= Eµ

! T!µ!"!

"Jµ= nuµ

+ !V µ+ "#µ

+ "BBµ

= Fµ!

2!µ!"#

2"µ!"#

u!!"u#

Complete constitutive equations in 3+1 (with external gauge field)

(non-conformal) hydrodynamics in 3+1

Tµ! = (! + P )uµu! + Pgµ!! "!µ"!!#(#"u# + ##u") ! ($ !

3")!µ!

V µ= Eµ

! T!µ!"!

"Jµ= nuµ

+ !V µ+ "#µ

+ "BBµ

= Fµ!

2!µ!"#

2"µ!"#

u!!"u#

New transport coefficients restricted

Chiral magnetic effect

Predicted values:[Kharzeev, Son 1010.0038]

Observable in heavy-ion collisions

Complete first order constitutive equations in 3+1dim discovered in gravity without prejudice.

Gauge/Gravity method gives you everything there is inside a model.

Un-biased predictive power

Chiral magnetic effect predicted: [Kharzeev 2004]

What we did not know:

Ignorance is bliss:

Word of caution:Gauge/Gravity is not entirely universal. Values of e.g. transport

coefficients and features are generally model-dependent.But within the model you get “everything”.

Chiral vortical effect proposed: [Kharzeev, Zhitnitsky 2007]

Needs corrections: [Landau, Lifshitz]

Complete first order constitutive equations in 3+1dim discovered in gravity without prejudice.

Gauge/Gravity method gives you everything there is inside a model.

Un-biased predictive power

Chiral magnetic effect predicted: [Kharzeev 2004]

What we did not know:

Ignorance is bliss:

Word of caution:Gauge/Gravity is not entirely universal. Values of e.g. transport

coefficients and features are generally model-dependent.But within the model you get “everything”.

Chiral vortical effect proposed: [Kharzeev, Zhitnitsky 2007]

Needs corrections: [Landau, Lifshitz]

Take a model, check for ridge, change model

Hydrodynamic two-point-functionsSimplified example in 2+1 dim:

Jµ= !0u

µ+ "Eµ

uµ = (1, 0, 0)

!0 = "!Allow response

External sources

(fix T and u)

At, Ax ! e!i!t+ikx

Jµ= !0u

µ+ "Eµ

uµ = (1, 0, 0)

External sources

One-point-functions from solving

(fix T and u)

!J t" = !" = #i#k

$ + ik2 !"

($Ax + kAt)

"!Jx" = !" = #

$ + ik2 !"

($Ax + kAt)

At, Ax ! e!i!t+ikx

Einsteinrelation for diffusion:

!Jy" = 0

!µJµ

Jµ= !0u

µ+ "Eµ

uµ = (1, 0, 0)

External sources

(fix T and u)

!J t" = !" = #i#k

$ + ik2 !"

($Ax + kAt)

"!Jx" = !" = #

$ + ik2 !"

($Ax + kAt)

At, Ax ! e!i!t+ikx

!Jy" = 0 Two-point-functions! !J tJ

x" =!!J t"

= #i"#k

# + iDk2

Kubo formulae for transport coefficients!

!µJµ

Jµ= !0u

µ+ "Eµ

uµ = (1, 0, 0)

External sources

(fix T and u)

!J t" = !" = #i#k

$ + ik2 !"

($Ax + kAt)

"!Jx" = !" = #

$ + ik2 !"

($Ax + kAt)

At, Ax ! e!i!t+ikx

!Jy" = 0 Two-point-functions! !J tJ

x" =!!J t"

= #i"#k

# + iDk2

generally: T and u respond as well

Kubo formulae for transport coefficients!

possible: more sources

!µJµ

Decomposition(Lorentz-

invariance implied)

Field redefinition ambiguity out-of-

equilibrium

Tµ! = Euµu! + P!µ! + (qµu!+q!uµ) + tµ!

Jµ = Nuµ + jµ

Example: Landau frame

T (x) ! T (x)

u!(x) ! u!(x)

µ(x) ! µ(x)

Fix by choice of a particular

hydrodynamic frame

qµ = 0 E = !0 N = "0

uµqµ= 0, uµtµν

= 0, uµjµ= 0

I. Gauge/Gravity & Heavy-Ion-CollisionsHydrodynamic Frames

jµ = · · · + !T !µ!!!T + . . .Example: Temperature gradient

I. Gauge/Gravity & Heavy-Ion-CollisionsHydro without entropy current

Two-point functions together with “equilibrium correlators“ replace the entropy argument.

Proven for 2+1 dimensions: [Jensen, MK, Kovtun, Meyer, Ritz, Yarom 1112.4498]]

Proven for “equality type” conditions in d dimensions: [Jensen, MK, Kovtun, Meyer, Ritz, Yarom 1203.3556]]

Generating functional !

I. Gauge/Gravity & Heavy-Ion-CollisionsHydro without entropy current

Two-point functions together with “equilibrium correlators“ replace the entropy argument.

Proven for 2+1 dimensions: [Jensen, MK, Kovtun, Meyer, Ritz, Yarom 1112.4498]]

Proven for “equality type” conditions in d dimensions: [Jensen, MK, Kovtun, Meyer, Ritz, Yarom 1203.3556]]

Inequality type: ! ! 0 ! ! 0

Example: Equality type

!Generally: m-point functions,simplifies higher order hydro

(zero frequency)Example: Ideal superfluid

(from two-point functions)

!T = 0

Matthias Kaminski Hydrodynamics, Gauge/Gravity Correspondence & the Ridge Page

Gauge/Gravity provides playground without prejudice

Various models of particle collisions exist

Relativistic hydrodynamics was completed at first and second order (Careful with “Causal Viscous Hydro”).

Chiral transport effects measured in heavy-ion-collisions?[Kharzeev, Son]

[Baier et al, Minwalla et al 2007]

I. Gauge/Gravity & Heavy-Ion-CollisionsSummary of part I

[Erdmenger, Haack, MK, Yarom 0809.2488][Banerjee et al. 0809.2596]

New methods for hydrodynamic correlation functionsNew method restricting transport coefficients

✓ Review: Gauge/Gravity & Heavy-Ion-Collisions

IV. Conclusions

• Gauge/Gravity

A “first guess”

Pre-Equilibrium Model I

Single gravitational shock-wave metric

Solves Einstein’s equations in AdS5

Energy-momentum tensor component

z is the radial AdS-direction

L is the AdS-radius

[Janik, Peschanski, 2005]

Pre-Equilibrium Model I

Single gravitational shock-wave metric

Solves Einstein’s equations in AdS5

Energy-momentum tensor component

z is the radial AdS-direction

L is the AdS-radius

[Janik, Peschanski, 2005]

Collide two shock waves with

This gives

which is analytically known (perturbatively)

Evolution of two colliding initial states with finite energy density, finite thickness, Gaussian profile, in N=4 Super-Yang-Mills theory at strong coupling.

Full planar shock-wave, non-singular, time-dependent, numerical solution to Einstein’s equations.

Contains strong coupling and “medium” effects.

Pre-Equilibrium Model II

[Chesler, Yaffe 1011.3562]

“Holography and colliding gravitational shock waves in asymptotically AdS_5 spacetime”

Ansatz:

Pre-Equilibrium Model II

[Chesler, Yaffe 1011.3562]

“Holography and colliding gravitational shock waves in asymptotically AdS_5 spacetime”

Pick Gaussian (arbitrary)

Initial data:

Basic idea:

[Grigoryan, Kovchegov 1012.5431]

“Long-Range Rapidity Correlations in Heavy Ion Collisions at Strong Coupling from AdS/CFT”

Collision of nuclei

Correlations at early times

Correlations at late times

Metric of Model I

Fluctuations around this

Fluctuations around dual to ideal Bjorken

Gauge Gravity

Recipe: Two-point correlator from fluctuations

Action for gravity scalar field fluctuation (dual to glueball)

Solve equation of motion for that scalar

On-shell action

Real-time retarded Green’s function

[Son, Starinets 2002]

Implications

[cf. talk by K. Dusling]

Large-rapidity glueball correlations in simplest background look very different from ridge data. But there are large-rapidity correlations at early times.

Computation in background dual to ideal Bjorken hydrodynamics gives no large-rapidity correlations

at late times.

✓ Review: Gauge/Gravity & Heavy-Ion-Collisions

✓ Gauge/Gravity Models for the Ridge

IV. Conclusions

• Gauge/Gravity

Toy models for hydrodynamic flow vs. toy models of jets

PROPOSAL

Compute fluctuations around the full numerical background metric of model II at different times to scan the full time evolution of correlations.

Correlations after collision of two nulei in a medium

Step in this direction:

Compute fluctuations around simplified version of model II(dual to two-point correlation functions). Check fluctuation dissipation theorem and equilibration.

[Chesler, Teaney 2011]

Take a string falling/being torn apart (backreacted)

Compute fluctuations around this background (dual to two-point correlation functions)

Initial conditions?

Model of a jet

AdS boundary

radial AdScoordinate

Origin or black hole horizon

Hydrodynamics, AdS/CFT Correspondence & the RidgeHydrodynamics, AdS/CFT Correspondence & the...

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