Summary: Theory Matter at Extreme Conditions: Then & Now January 2014 Bose Institute, Kolkata

1. Summary: TheoryMatter at ExtremeConditions: Then & NowJanuary 2014Bose Institute, Kolkata

2. The talks have provided comprehensive coverage of the Whole field, from laboratory searches of QGP to cores of compact Stars. Broad topics: Probes of QGP Heavy quark, Quarkokinum Angular correlations FAIR: from atomic physics to compressed baryonic matter Astrophysics: Compact star cores, GRBs, Perturbative QCD Lattice QCD: hadrons, equation of state Effective models

3. Blaizot

7. Umme Jamil Collisional energy loss for heavy quarks nuclear suppression factor with consideration of both radiative and collision energy loss along with longitudinal expansion of the medium.

8. Effect of flow on heavy quark damping rate in hot QCD plasma Including viscous effects of the plasma Sreemoyee Sarkar Dissociation of quarkonium in a complex potential – Lata Thakur Imaginary part provides a contribution to the width of quarkonium bound states which in turn determines their dissociation temperatures. Quarkonium effectively dissociates at a lower temperature although binding energy is non-zero but overtaken by the Landau-damping induced thermal width. Gluon radiation off heavy flavor jets - Trambak Bhattacharya • Consideration of non-eikonality is needed for studying transverse momentum broadening - Effect on the equilibrium distribution of HQ as well as on viscosity

9. Heavy quarks, Boltzman vs Langevin dynamicsV. Greco No interaction means RAA=1 and v2=0. More interaction decrease RAA and increase v2 RAA can be “generated” faster than v2 A typical example The relation between RAA and time is not trivial and depend on how one interact and loose energy with time. This is general, seen also for light quarks

10. Now what we are doing : • study the validity of the Brownian motion assumption, is it really small momentum transfer dynamics? • RAA is as smaller as for light mesons • If resonant scattering is important can it be that the momentum transfer per collisions is small? • RAA- v2 of HQ seems to indicate: • - Elastic collisional dynamics (up to 6-8 GeV) • - Interaction not trivially decreasing with r-1≈ T3 ≈ t-1 • (heavy resonances above Tc or …) • - Hadronization of by coalescence of heavy quarks • Boltzmann vs Langevin: • - For Bottom most likely no differences, but charm… • does not seems to have a Brownian motion • - Possible to get same RAA(pT) by readjusting Drag by 15-50%

11. Somnath De QCD back-scattering photons at LHC : LO RAA : (Signal + Background)AA / Ncoll(Background)pp • For central Pb+Pb collisions at 2.76 TeV at mid rapidity • Photons opposite to the 60-65 GeV jet within  15 degrees • The quarks suffer energy loss before conversion A clear back scattering peak is seen, despite finite trigger interval

12. Direct photons: P. Guptaroy The Model (Sequential Chain Model) ICMEC-2014 (PGR)

13. Perturbative QCD - Purnendu Chakraborti

15. LATTICE: Nilmani Mathur

17. LATTICE: The equation of state at fininte chemical potential: Sourendu Gupta Search for critical point using Taylor expansion method Critical slowing down, computer time….. Indication that critical point is nearby Already exploring the critical regime, signals of critical point Estimates of pressure with suitable account of the critical Regime.

18. Exploring the critical regime of QCD using QCD like To flavor models - Vivek Tiwari PQM Model is used to probe the critical regime in QCD phase diagram. Improved model with Fermionic vacuum term is used. Critical value Of chemical potential increases. The critical regime Spans along the first order transition line. Multiple freezeout - Sandeep Chatterjee Strange and non-strange hadrons are assumed to Freezeout at different stages. Associated temperatures And volumes are estimated.

19. Deconfinement and clustering of color sources: B. Srivastava Multiple color strings stretching between colliding Nuclei form localized color disks in the transverse Plane. Percolation techniques are used to estimate When color charges become deconfined. Similarity with color glass condensate model. Long range rapidity correlations and ridge structure. Thermodynamics with the percolation model, string Fluctuations, good comparison with lattice Elliptic flow, estimate of viscosity

20. P. Jayaprakash

22. h‘ mass , Chiral symmetry restoration and UA(1) effect ? S.H. Lee a1 mass ? QCD Lagrangian Finite T Usual vacuum h‘ r ? p

23. Witten-Veneziano formula – II • h‘ meson Lee, Zahed (01) at m  0 limit Should be related to

24. LET (Novikov, Shifman, Vainshtein, Zhakarov) at finite temperature : Ellis, Kapusta, Tang (98) • Lee, Zahed (2001)

25. W-V formula at finite temperature: Smooth temperature dependence even near Tc Therefore , :  eta’ mass should decrease at finite temperature

33. Shear viscosity as a function of temperature in Chapman-Enskog approximation Sukanya Mitra Medium effects on interacting pion gas We can see a clear difference in the temperature dependence of shear viscosity with and without medium modification of the ρ propagator and it is more prominent from the heavy meson loops which considered as the multipion contribution to ρ self-energy compare to ππ loop. The upper set of curves uses the upper limit of integration over ψ ̴ 2 , which corresponds EC.M. =2mπcoshψ ̴̴1 GeV for ππ scattering while the lower set denotes actual upper limit , i.e. ∞, the difference between two sets of curve indicates the uncertainties of result due to insufficient information of cross section at higher energies. ,

34. Relativistic third order viscous hydrodynamics from kinetic heory Amaresh Jaisawal

36. GLR-MQ eqn.-Mayuri Devee Q2-evolution of gluon distribution function

40. Quark nugget formation in the early universe Abhiske Atreya

41. Pulsar kick velocities:Non-Fermi liquid effects - Souvik O. Adhya

43. Niharranjan Panda

45. T. Hatsuda