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Direct photon spectra from uranium-uranium collisions at FAIR energies(E(lab) = 35 AGeV) are calculated within the hadronic Ultra-relativisticQuantum Molecular Dynamics transport model. In this microscopic model, one canoptionally include a macroscopic intermediate hydrodynamic phase. The hot anddense stage of the collision is then modeled by a hydrodynamical calculation.Photon emission from transport-hydro hybrid calculations is examined for purelyhadronic matter and matter that has a cross-over phase transition and acritical end point to deconfined and chirally restored matter at hightemperatures. We find the photon spectra in both scenarios to be dominated byBremsstrahlung. Comparing flow of photons in both cases suggests a way todistinguish these two scenarios.

Soft Photons from transport and hydrodynamics at FAIR energies