Abstract:

The dependence on initial conditions of thermal production rates 
for photons and dileptons in the quark-gluon plasma is discussed.  
We also consider using these signals to experimentally determine 
plasma initial conditions.   Based on the chemical rate equations 
of Biro et al., we show that later emissions in the thermal 
expansion conceal information about the initial conditions in the 
region of low p_T and M, making determination of initial
conditions difficult.