A New Analytic Two-component Model for Thermal Radiation in High-energy Heavy-ion Collisions

In high-energy heavy-ion collisions, a strongly coupled, hot and dense medium is created. Direct photon measurements are excellent probes to study the time evolution and the equation of state of this peculiar matter. In this work, I describe the thermal radiation of the medium using a new analytic hydrodynamic model and apply an equation of state, which I have constrained based on the lattice QCD equation of state. I also compare the model with recent PHENIX measurements. Abstract Published by the Jagiellonian University 2025 authors