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門内 晶彦 (東大理) 重イオン衝突における粘性流体描像 第 19 回 Heavy Ion Café 並びに第 12 回 Heavy Ion Pub 合同研究会 「 QCD 物質の最前線」、 2011 年 6 月 8 日、名古屋大学.

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Presentation on theme: "門内 晶彦 (東大理) 重イオン衝突における粘性流体描像 第 19 回 Heavy Ion Café 並びに第 12 回 Heavy Ion Pub 合同研究会 「 QCD 物質の最前線」、 2011 年 6 月 8 日、名古屋大学."— Presentation transcript:

1 門内 晶彦 (東大理) 重イオン衝突における粘性流体描像 第 19 回 Heavy Ion Café 並びに第 12 回 Heavy Ion Pub 合同研究会 「 QCD 物質の最前線」、 2011 年 6 月 8 日、名古屋大学

2 Joint Meeting of HIC19 and HIP12 “Frontiers of QCD Matter”, June 8 th 2011, Nagoya Akihiko Monnai (The University of Tokyo) Viscous Fluids in Heavy Ion Collisions Next slide: Introduction “Standard model” of a high-energy heavy ion collision (at RHIC) New Developments particles hadronic phase QGP phase Freezeout Pre- equilibrium Hydrodynamic stage Color glass condensate Hadronic cascade Glasma/Thermalization Freezeout t z t Relativistic hydrodynamics Description of collective motion of the QGP (τ ~ 1-10 fm/c) Discuss the latest experimental data at LHC and RHIC from the perspectives of viscous fluids

3 Joint Meeting of HIC19 and HIP12 “Frontiers of QCD Matter”, June 8 th 2011, Nagoya Akihiko Monnai (The University of Tokyo) Viscous Fluids in Heavy Ion Collisions Next slide: New Developments Higher-order harmonics (v 3, v 4, v 5 …) Higher-Order Harmonics - Quantified in hydrodynamic models - Product of initial fluctuations More observables = more constraints on models ALICE plenary ATLAS plenary

4 Joint Meeting of HIC19 and HIP12 “Frontiers of QCD Matter”, June 8 th 2011, Nagoya Akihiko Monnai (The University of Tokyo) Viscous Fluids in Heavy Ion Collisions Next slide: Higher-Order Harmonics Initial conditions: Glauber (η/s = 1/4π) vs. MC-KLN (η/s = 2/4π) This does not rule out the KLN v 3 in favor of Glauber? - η/s would not be indep. of temperature - Thermalization (CGC  hydro) - Bumpy initial conditions may mimic viscosity PHENIX arXiv: *CGC w/o resonance decay and multiplied by factors obtained in Glauber Higher-Order Harmonics

5 Joint Meeting of HIC19 and HIP12 “Frontiers of QCD Matter”, June 8 th 2011, Nagoya Akihiko Monnai (The University of Tokyo) Viscous Fluids in Heavy Ion Collisions Next slide: Higher-Order Harmonics Shear viscosity: Glauber (η/s = 0) vs. Glauber (η/s = 1/4π) v 3 “has different sensitivity to η/s than v 2 !” In other words, no complete data fit by a single η/s (at least for now) ALICE (Talk by J. Schukraft) Higher-Order Harmonics Bulk viscosity ζ/s ≠ 0 around T c ; can become non-negligible CMS (Talk by J. Velkovska)

6 Joint Meeting of HIC19 and HIP12 “Frontiers of QCD Matter”, June 8 th 2011, Nagoya Akihiko Monnai (The University of Tokyo) Viscous Fluids in Heavy Ion Collisions Next slide: Higher-Order Harmonics Temperature dependent η/s Hadronic viscosity always important; QGP viscosity more important at LHC than at RHIC? Higher-Order Harmonics Talk by H. Niemi Poster by C. Shen

7 Joint Meeting of HIC19 and HIP12 “Frontiers of QCD Matter”, June 8 th 2011, Nagoya Akihiko Monnai (The University of Tokyo) Viscous Fluids in Heavy Ion Collisions Next slide: Higher-Order Harmonics Flux tubes in initial conditions Higher-Order Harmonics v n may depend on “bumpiness” of the initial geometry which mimics viscosity Talk by Ph. Mota

8 Joint Meeting of HIC19 and HIP12 “Frontiers of QCD Matter”, June 8 th 2011, Nagoya Akihiko Monnai (The University of Tokyo) Viscous Fluids in Heavy Ion Collisions Next slide: Higher-Order Harmonics More observables translate into more constraints Towards Integrated Pictures - Higher order harmonics in Au-Au and Pb-Pb collisions - U-U collisions at RHIC for clearer intrinsic v 4 ? - Intrinsic odd-order harmonics (v 3, v 5 …) in asymmetric collisions (e.g. Cu-Pb) ? Product of fluctuation in initial conditions; centrality independent Clear centrality dependences may be observed Possible “other” observables

9 Joint Meeting of HIC19 and HIP12 “Frontiers of QCD Matter”, June 8 th 2011, Nagoya Akihiko Monnai (The University of Tokyo) Viscous Fluids in Heavy Ion Collisions Next slide: Towards Integrated Pictures Not only transverse; Longitudinal dynamics Charged particle multiplicity (0-5%) CGC Pb+Pb, 2.76 TeV at η = 0 ALICE: dN ch /dη = 1584 ± 4 ± 76 CMS: dN ch /dη = 1610 ± 55 CGC predictions dN ch /dη ~ 1200 ? Towards Integrated Pictures

10 Joint Meeting of HIC19 and HIP12 “Frontiers of QCD Matter”, June 8 th 2011, Nagoya Akihiko Monnai (The University of Tokyo) Viscous Fluids in Heavy Ion Collisions Next slide: Towards Integrated Pictures CGC rapidity distribution + Full 2 nd order viscous hydro RHIC LHC Entropy flux Entropy production If the true λ is larger at RHIC, it enhances dN/dy at LHC; Hydro effect is an important factor in explaining the LHC data If the true λ is larger at RHIC, it enhances dN/dy at LHC; Hydro effect is an important factor in explaining the LHC data Currently (1+1)D; (3+1)D viscous hydro under development AM and T. Hirano, arXiv: Towards Integrated Pictures

11 Joint Meeting of HIC19 and HIP12 “Frontiers of QCD Matter”, June 8 th 2011, Nagoya Akihiko Monnai (The University of Tokyo) Viscous Fluids in Heavy Ion Collisions Next slide: Towards Integrated Pictures CGC rapidity distribution + Full 2 nd order viscous hydro Currently (1+1)D; (3+1)D viscous hydro under development RHIC LHC Entropy flux Entropy production If the true λ is larger at RHIC, it enhances dN/dy at LHC; Hydro effect is an important factor in explaining the LHC data If the true λ is larger at RHIC, it enhances dN/dy at LHC; Hydro effect is an important factor in explaining the LHC data If the λ is unchanged at RHIC, dN/dy is still enhanced at LHC; Hydro effect is an important factor in explaining the LHC data If the λ is unchanged at RHIC, dN/dy is still enhanced at LHC; Hydro effect is an important factor in explaining the LHC data AM and T. Hirano, arXiv: Towards Integrated Pictures


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