Feb 5 – 11, 2017
Hyatt Regency Chicago
America/Chicago timezone

How brightly does the Glasma shine? Photon production off-equilibrium and the v2 puzzle.

Feb 7, 2017, 11:40 AM
Regency C

Regency C


Naoto Tanji (Heidelberg University)


Large scale classical statistical simulations confirm [1] that the correct kinetic theory describing the off-equilibrium Glasma is the "bottom-up” thermalization scenario [2]. Detailed simulations demonstrate that the bottom-up results match on to relativistic viscous hydrodynamics on time scales of order 1 Fermi for realistic values of the coupling [3]. We explore the detailed implications of this scenario for photon production in the Glasma relative to the QGP [4]. In particular, we argue that the "reheating” phase of the bottom-up scenario will lead to enhanced production rates for photons and may possibly generate the significant flow anisotropies essential for resolving the v2 puzzle. We report on first kinetic simulations of photon production in the expanding Glasma that will quantify our estimates and determine how brightly the Glasma shines relative to the QGP [5].

[1] J. Berges, K. Boguslavski, S. Schlichting, R. Venugopalan, Phys. Rev. D89 (2014) no. 7, 074011; ibid., no. 11, 114007.

[2] R. Baier, A. H. Mueller, D. Schiff, D. T. Son, Phys. Lett. B502 (2001) 51.

[3] A. Kurkela and Y. Zhu, Phys. Rev. Lett. 115 (2015) no. 18, 182301.

[4] N. Tanji, J. Berges, K. Reygers, R. Venugopalan, in preparation.

[5] N. Tanji and R. Venugopalan, in preparation.

Preferred Track Electromagnetic Probes
Collaboration Not applicable

Primary author

Naoto Tanji (Heidelberg University)

Presentation materials