Probing the structure of the initial state of heavy-ion collisions with P-T-dependent flow fluctuations

Agradecimentos: We are thankful to G. S. Denicol, D. Teaney, and A. Mazeliauskas for fruitful discussions. This research was funded by FAPESP Grants No. 2016/13803-2 (D.D.C.), No. 2016/24029-6 (M.L.), No. 2017/05685-2 (all), No. 2018/01245-0 (T.N.dS.), No. 2018/07833-1 (M.H.), and No. 2019/16293-3 (J.G.P.B.). D.D.C., M.L., and J.T. thank CNPq for financial support. J.N. is partially supported by the U.S. Department of Energy, Office of Science, Office for Nuclear Physics under Award No. DE-SC0021301. This research used the computing resources and assistance of the John David Rogers Computing Center (CCJDR) in the Institute of Physics "Gleb Wataghin," University of Campinas Abstract: The connection between initial-state geometry and anisotropic flow can be quantified through a well-established mapping between P-T-integrated flow harmonics and cumulants of the initial transverse energy distribution. In this paper we successfully extend this mapping to also include P-T-differential flow. In doing so, we find that subleading principal components of anisotropic flow can reveal previously unobserved details of the hydrodynamic response, in both the linear and the nonlinear regimes. Most importantly, we show that they provide novel information on the small-scale structures present in the initial stage of relativistic heavy-ion collisions FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ Fechado