Conductivity and non-commutative holographic QCD M. Ali-Akbari School of physics, IPM, Iran Sixth Crete regional meeting in string theory Milos, 2011.

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Presentation transcript:

Conductivity and non-commutative holographic QCD M. Ali-Akbari School of physics, IPM, Iran Sixth Crete regional meeting in string theory Milos, 2011

1.Conductivity from AdS/CFT 2. Sakai-Sugimoto model 2-1. Low temperature 2-2. High temperature 3. Conductivity 2-1. At low temperature 2-2. At high temperature Outline

AdS/CFT Strongly coupled gauge theory (QCD) + flavor Gravity + D-brane 1.Supersymmetric background. 2.Confinment-Deconfinment phase transition.

1. Strongly coupled thermal field theory. 2. Charge carriers introduced explicitly. 3. Electric filed. 4. Conductivity. 1.AdS Sch. BH 2.Time component of gauge field on D7-branes ( ). 3. Spatial component of gauge field. 4. Karch and A.O'Bannon, “Metallic AdS/CFT,’’ [arXiv: [hep-th]]. Gauge theory side Gravity side

Conductivity in AdS Sch. Background (Massless case) Charge carriers thermally produced. Charge carriers introduced explicitly by By setting, we still have conductivity.

Non-commutative low temperature SS-model Low temperature SS-model 1.Confined phase. 2.Chiral symmetry is broken. Sakai-Sugimoto background [1] T. Sakai and S. Sugimoto, ``Low energy hadron physics in holographic QCD,'‘ [hep-th/ ]. [2] O. Aharony, J. Sonnenschein and S. Yankielowicz, ``A Holographic model of deconfinement and chiral symmetry restoration,'' [hep-th/ ].

High temperature SS-model Noncommutative high temperature SS-model 1.Deconfined phase. 2.Chiral symmetry is restored (intermdiate state).

DBI action Induced metric and B-field B-field in background Ansatz D8-branes Conductivity

Action Solution for gauge field Equation of motion for gauge field

Reality condition and conductivity equations Conductivity Root of the first equation

Reality condition and conductivity equations Roots Conductivity (Thermal case)

A more general backgroud Ansatz DBI action

New ansatz DBI action conductivity equations Roots Conductivity

Commutative case Non-commutative case