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Direct photon production, in $\sqrt{s_{NN}}$=200 GeV Au+Au and in$\sqrt{s_{NN}}$=2.76 TeV Pb+Pb collisions, are studied in a hydrodynamic model.  Ideal hydrodynamic model, initialised to reproduce experimentally chargedparticle spectra in RHIC and LHC energy, also reproduces the PHENIX and ALICEmeasurements for the direct photon spectra in Au+Au collisions at RHIC andPb+Pb collisions at LHC. The model however produces less elliptic flow than inexperiment. Discrepancy between experiment and hydrodynamic simulation iscomparatively less in Pb+Pb collisions at LHC than in Au+Au collisions at RHIC.We also studied direct photon correlation and determined the HBT radii. In0-10%-50-60% collisions, HBT radii in Au+Au or in Pb+Pb collisions do not showlarge centrality dependence. Energy dependence of the HBT radii for directphotons is also not large.

Direct photon production and interferometry in $\sqrt{s}_{NN}$=200 GeV Au+Au and in $\sqrt{s}_{NN}$=2.76 TeV Pb+Pb collisions