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